596 lines
18 KiB
Diff
596 lines
18 KiB
Diff
commit 92fdb11ae7aa1ab6b18622670ea702205cd6fdc5
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Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
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Date: Tue Feb 28 14:23:59 2023 -0300
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powerpc: Remove powerpc64 strncmp variants
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The default, and power7 implementation just adds word aligned
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access when inputs have the same aligment. The unaligned case
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is still done by byte operations.
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This is already covered by the generic implementation, which also add
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the unaligned input optimization.
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Checked on powerpc64-linux-gnu built without multi-arch for powerpc64,
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power7, power8, and power9 (build for le).
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Reviewed-by: Rajalakshmi Srinivasaraghavan <rajis@linux.ibm.com>
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Conflicts:
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sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S
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sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S
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sysdeps/powerpc/powerpc64/power7/strncmp.S
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sysdeps/powerpc/powerpc64/strncmp.S
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(copyright year changes upstream)
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
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index 5b20dab108de14ab..0ee7ce39d6470d80 100644
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--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
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+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
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@@ -12,7 +12,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
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strnlen-power8 strnlen-power7 strnlen-ppc64 \
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strcasecmp-power7 strcasecmp_l-power7 \
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strncase-power7 strncase_l-power7 \
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- strncmp-power8 strncmp-power7 strncmp-ppc64 \
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+ strncmp-power8 strncmp-ppc64 \
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strchr-power8 strchr-power7 strchr-ppc64 \
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strchrnul-power8 strchrnul-power7 strchrnul-ppc64 \
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strcpy-power8 strcpy-power7 strcpy-ppc64 stpcpy-power8 \
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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index 914e7d5e28a98b5d..2c84d287ee76a7ea 100644
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--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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@@ -175,8 +175,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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#endif
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IFUNC_IMPL_ADD (array, i, strncmp, hwcap2 & PPC_FEATURE2_ARCH_2_07,
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__strncmp_power8)
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- IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_ARCH_2_06,
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- __strncmp_power7)
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IFUNC_IMPL_ADD (array, i, strncmp, 1,
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__strncmp_ppc))
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S
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deleted file mode 100644
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index 8282ff076c9e00ce..0000000000000000
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--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S
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+++ /dev/null
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@@ -1,23 +0,0 @@
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-/* Copyright (C) 2013-2021 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, see
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- <https://www.gnu.org/licenses/>. */
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-
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-#define STRNCMP __strncmp_power7
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-
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-#undef libc_hidden_builtin_def
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-#define libc_hidden_builtin_def(name)
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-
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-#include <sysdeps/powerpc/powerpc64/power7/strncmp.S>
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S
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deleted file mode 100644
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index c6f325650c9ace3b..0000000000000000
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--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S
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+++ /dev/null
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@@ -1,26 +0,0 @@
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-/* Copyright (C) 2013-2021 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, see
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- <https://www.gnu.org/licenses/>. */
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-
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-#if defined SHARED && IS_IN (libc)
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-# define STRNCMP __strncmp_ppc
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-
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-# undef libc_hidden_builtin_def
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-# define libc_hidden_builtin_def(name) \
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- .globl __GI_strncmp; __GI_strncmp = __strncmp_ppc
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-#endif
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-
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-#include <sysdeps/powerpc/powerpc64/strncmp.S>
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c
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new file mode 100644
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index 0000000000000000..09cc009a913ed169
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--- /dev/null
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+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c
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@@ -0,0 +1,7 @@
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+#if defined SHARED && IS_IN (libc)
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+# define STRNCMP __strncmp_ppc
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+# undef libc_hidden_builtin_def
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+# define libc_hidden_builtin_def(name) \
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+ __hidden_ver1 (__strncmp_ppc, __GI_strncmp, __strncmp_ppc);
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+#endif
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+#include <string/strncmp.c>
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
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index 275a558e4afa7d61..df2c0707a919ad79 100644
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--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
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+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
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@@ -26,7 +26,6 @@
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# include "init-arch.h"
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extern __typeof (strncmp) __strncmp_ppc attribute_hidden;
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-extern __typeof (strncmp) __strncmp_power7 attribute_hidden;
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extern __typeof (strncmp) __strncmp_power8 attribute_hidden;
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# ifdef __LITTLE_ENDIAN__
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extern __typeof (strncmp) __strncmp_power9 attribute_hidden;
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@@ -43,7 +42,5 @@ libc_ifunc_redirected (__redirect_strncmp, strncmp,
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# endif
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(hwcap2 & PPC_FEATURE2_ARCH_2_07)
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? __strncmp_power8
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- : (hwcap & PPC_FEATURE_ARCH_2_06)
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- ? __strncmp_power7
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- : __strncmp_ppc);
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+ : __strncmp_ppc);
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#endif
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diff --git a/sysdeps/powerpc/powerpc64/power7/strncmp.S b/sysdeps/powerpc/powerpc64/power7/strncmp.S
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deleted file mode 100644
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index d91aeb6077a558f2..0000000000000000
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--- a/sysdeps/powerpc/powerpc64/power7/strncmp.S
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+++ /dev/null
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@@ -1,228 +0,0 @@
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-/* Optimized strcmp implementation for POWER7/PowerPC64.
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- Copyright (C) 2010-2021 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, see
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- <https://www.gnu.org/licenses/>. */
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-
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-#include <sysdep.h>
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-
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-#ifndef STRNCMP
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-# define STRNCMP strncmp
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-#endif
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-
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-/* See strlen.s for comments on how the end-of-string testing works. */
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-
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-/* int [r3] strncmp (const char *s1 [r3],
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- const char *s2 [r4],
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- size_t size [r5]) */
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-
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- .machine power7
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-ENTRY_TOCLESS (STRNCMP, 5)
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- CALL_MCOUNT 3
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-
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-#define rTMP2 r0
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-#define rRTN r3
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-#define rSTR1 r3 /* first string arg */
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-#define rSTR2 r4 /* second string arg */
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-#define rN r5 /* max string length */
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-#define rWORD1 r6 /* current word in s1 */
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-#define rWORD2 r7 /* current word in s2 */
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-#define rWORD3 r10
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-#define rWORD4 r11
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-#define rFEFE r8 /* constant 0xfefefefefefefeff (-0x0101010101010101) */
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-#define r7F7F r9 /* constant 0x7f7f7f7f7f7f7f7f */
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-#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */
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-#define rBITDIF r11 /* bits that differ in s1 & s2 words */
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-#define rTMP r12
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-
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- dcbt 0,rSTR1
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- nop
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- or rTMP,rSTR2,rSTR1
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- lis r7F7F,0x7f7f
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- dcbt 0,rSTR2
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- nop
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- clrldi. rTMP,rTMP,61
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- cmpldi cr1,rN,0
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- lis rFEFE,-0x101
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- bne L(unaligned)
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-/* We are doubleword aligned so set up for two loops. first a double word
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- loop, then fall into the byte loop if any residual. */
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- srdi. rTMP,rN,3
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- clrldi rN,rN,61
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- addi rFEFE,rFEFE,-0x101
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- addi r7F7F,r7F7F,0x7f7f
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- cmpldi cr1,rN,0
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- beq L(unaligned)
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-
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- mtctr rTMP
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- ld rWORD1,0(rSTR1)
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- ld rWORD2,0(rSTR2)
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- sldi rTMP,rFEFE,32
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- insrdi r7F7F,r7F7F,32,0
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- add rFEFE,rFEFE,rTMP
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- b L(g1)
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-
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-L(g0):
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- ldu rWORD1,8(rSTR1)
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- bne cr1,L(different)
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- ldu rWORD2,8(rSTR2)
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-L(g1): add rTMP,rFEFE,rWORD1
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- nor rNEG,r7F7F,rWORD1
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- bdz L(tail)
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- and. rTMP,rTMP,rNEG
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- cmpd cr1,rWORD1,rWORD2
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- beq L(g0)
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-
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-/* OK. We've hit the end of the string. We need to be careful that
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- we don't compare two strings as different because of gunk beyond
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- the end of the strings... */
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-
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-#ifdef __LITTLE_ENDIAN__
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-L(endstring):
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- addi rTMP2, rTMP, -1
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- beq cr1, L(equal)
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- andc rTMP2, rTMP2, rTMP
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- rldimi rTMP2, rTMP2, 1, 0
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- and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */
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- and rWORD1, rWORD1, rTMP2
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- cmpd cr1, rWORD1, rWORD2
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- beq cr1, L(equal)
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- cmpb rBITDIF, rWORD1, rWORD2 /* 0xff on equal bytes. */
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- addi rNEG, rBITDIF, 1
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- orc rNEG, rNEG, rBITDIF /* 0's below LS differing byte. */
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- sldi rNEG, rNEG, 8 /* 1's above LS differing byte. */
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- andc rWORD1, rWORD1, rNEG /* mask off MS bytes. */
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- andc rWORD2, rWORD2, rNEG
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- xor. rBITDIF, rWORD1, rWORD2
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- sub rRTN, rWORD1, rWORD2
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- blt L(highbit)
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- sradi rRTN, rRTN, 63 /* must return an int. */
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- ori rRTN, rRTN, 1
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- blr
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-L(equal):
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- li rRTN, 0
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- blr
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-
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-L(different):
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- ld rWORD1, -8(rSTR1)
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- cmpb rBITDIF, rWORD1, rWORD2 /* 0xff on equal bytes. */
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- addi rNEG, rBITDIF, 1
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- orc rNEG, rNEG, rBITDIF /* 0's below LS differing byte. */
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- sldi rNEG, rNEG, 8 /* 1's above LS differing byte. */
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- andc rWORD1, rWORD1, rNEG /* mask off MS bytes. */
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- andc rWORD2, rWORD2, rNEG
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- xor. rBITDIF, rWORD1, rWORD2
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- sub rRTN, rWORD1, rWORD2
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- blt L(highbit)
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- sradi rRTN, rRTN, 63
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- ori rRTN, rRTN, 1
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- blr
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-L(highbit):
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- sradi rRTN, rWORD2, 63
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- ori rRTN, rRTN, 1
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- blr
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-
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-#else
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-L(endstring):
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- and rTMP,r7F7F,rWORD1
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- beq cr1,L(equal)
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- add rTMP,rTMP,r7F7F
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- xor. rBITDIF,rWORD1,rWORD2
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- andc rNEG,rNEG,rTMP
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- blt L(highbit)
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- cntlzd rBITDIF,rBITDIF
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- cntlzd rNEG,rNEG
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- addi rNEG,rNEG,7
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- cmpd cr1,rNEG,rBITDIF
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- sub rRTN,rWORD1,rWORD2
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- blt cr1,L(equal)
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- sradi rRTN,rRTN,63 /* must return an int. */
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- ori rRTN,rRTN,1
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- blr
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-L(equal):
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- li rRTN,0
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- blr
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-
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-L(different):
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- ld rWORD1,-8(rSTR1)
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- xor. rBITDIF,rWORD1,rWORD2
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- sub rRTN,rWORD1,rWORD2
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- blt L(highbit)
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- sradi rRTN,rRTN,63
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- ori rRTN,rRTN,1
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- blr
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-L(highbit):
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- sradi rRTN,rWORD2,63
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- ori rRTN,rRTN,1
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- blr
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-#endif
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-
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-/* Oh well. In this case, we just do a byte-by-byte comparison. */
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- .align 4
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-L(tail):
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- and. rTMP,rTMP,rNEG
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- cmpd cr1,rWORD1,rWORD2
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- bne L(endstring)
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- addi rSTR1,rSTR1,8
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- bne cr1,L(different)
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- addi rSTR2,rSTR2,8
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- cmpldi cr1,rN,0
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-L(unaligned):
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- mtctr rN
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- ble cr1,L(ux)
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-L(uz):
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- lbz rWORD1,0(rSTR1)
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- lbz rWORD2,0(rSTR2)
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- .align 4
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-L(u1):
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- cmpdi cr1,rWORD1,0
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- bdz L(u4)
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- cmpd rWORD1,rWORD2
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- beq cr1,L(u4)
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- bne L(u4)
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- lbzu rWORD3,1(rSTR1)
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- lbzu rWORD4,1(rSTR2)
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- cmpdi cr1,rWORD3,0
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- bdz L(u3)
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- cmpd rWORD3,rWORD4
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- beq cr1,L(u3)
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- bne L(u3)
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- lbzu rWORD1,1(rSTR1)
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- lbzu rWORD2,1(rSTR2)
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- cmpdi cr1,rWORD1,0
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- bdz L(u4)
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- cmpd rWORD1,rWORD2
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- beq cr1,L(u4)
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- bne L(u4)
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- lbzu rWORD3,1(rSTR1)
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- lbzu rWORD4,1(rSTR2)
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- cmpdi cr1,rWORD3,0
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- bdz L(u3)
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- cmpd rWORD3,rWORD4
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- beq cr1,L(u3)
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- bne L(u3)
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- lbzu rWORD1,1(rSTR1)
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- lbzu rWORD2,1(rSTR2)
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- b L(u1)
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-
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-L(u3): sub rRTN,rWORD3,rWORD4
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- blr
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-L(u4): sub rRTN,rWORD1,rWORD2
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- blr
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-L(ux):
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- li rRTN,0
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- blr
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-END (STRNCMP)
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-libc_hidden_builtin_def (strncmp)
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diff --git a/sysdeps/powerpc/powerpc64/strncmp.S b/sysdeps/powerpc/powerpc64/strncmp.S
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deleted file mode 100644
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index 40a230242cbdf733..0000000000000000
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--- a/sysdeps/powerpc/powerpc64/strncmp.S
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+++ /dev/null
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@@ -1,210 +0,0 @@
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-/* Optimized strcmp implementation for PowerPC64.
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- Copyright (C) 2003-2021 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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|
- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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|
-
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- The GNU C Library is distributed in the hope that it will be useful,
|
|
- but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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|
- Lesser General Public License for more details.
|
|
-
|
|
- You should have received a copy of the GNU Lesser General Public
|
|
- License along with the GNU C Library; if not, see
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- <https://www.gnu.org/licenses/>. */
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-
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-#include <sysdep.h>
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-
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-/* See strlen.s for comments on how the end-of-string testing works. */
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-
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-/* int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */
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-
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-#ifndef STRNCMP
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-# define STRNCMP strncmp
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-#endif
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-
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-ENTRY_TOCLESS (STRNCMP, 4)
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- CALL_MCOUNT 3
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-
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-#define rTMP2 r0
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-#define rRTN r3
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-#define rSTR1 r3 /* first string arg */
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-#define rSTR2 r4 /* second string arg */
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-#define rN r5 /* max string length */
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-#define rWORD1 r6 /* current word in s1 */
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-#define rWORD2 r7 /* current word in s2 */
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-#define rFEFE r8 /* constant 0xfefefefefefefeff (-0x0101010101010101) */
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-#define r7F7F r9 /* constant 0x7f7f7f7f7f7f7f7f */
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-#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */
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-#define rBITDIF r11 /* bits that differ in s1 & s2 words */
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-#define rTMP r12
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-
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- dcbt 0,rSTR1
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- or rTMP, rSTR2, rSTR1
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- lis r7F7F, 0x7f7f
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- dcbt 0,rSTR2
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- clrldi. rTMP, rTMP, 61
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- cmpldi cr1, rN, 0
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- lis rFEFE, -0x101
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- bne L(unaligned)
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-/* We are doubleword aligned so set up for two loops. first a double word
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- loop, then fall into the byte loop if any residual. */
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- srdi. rTMP, rN, 3
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- clrldi rN, rN, 61
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- addi rFEFE, rFEFE, -0x101
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- addi r7F7F, r7F7F, 0x7f7f
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- cmpldi cr1, rN, 0
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- beq L(unaligned)
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-
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- mtctr rTMP /* Power4 wants mtctr 1st in dispatch group. */
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- ld rWORD1, 0(rSTR1)
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- ld rWORD2, 0(rSTR2)
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- sldi rTMP, rFEFE, 32
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- insrdi r7F7F, r7F7F, 32, 0
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- add rFEFE, rFEFE, rTMP
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- b L(g1)
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-
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-L(g0):
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- ldu rWORD1, 8(rSTR1)
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- bne- cr1, L(different)
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- ldu rWORD2, 8(rSTR2)
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-L(g1): add rTMP, rFEFE, rWORD1
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- nor rNEG, r7F7F, rWORD1
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- bdz L(tail)
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- and. rTMP, rTMP, rNEG
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- cmpd cr1, rWORD1, rWORD2
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- beq+ L(g0)
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-
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-/* OK. We've hit the end of the string. We need to be careful that
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- we don't compare two strings as different because of gunk beyond
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- the end of the strings... */
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-
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-#ifdef __LITTLE_ENDIAN__
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-L(endstring):
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- addi rTMP2, rTMP, -1
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- beq cr1, L(equal)
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- andc rTMP2, rTMP2, rTMP
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- rldimi rTMP2, rTMP2, 1, 0
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- and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */
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- and rWORD1, rWORD1, rTMP2
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- cmpd cr1, rWORD1, rWORD2
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- beq cr1, L(equal)
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- xor rBITDIF, rWORD1, rWORD2 /* rBITDIF has bits that differ. */
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- neg rNEG, rBITDIF
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- and rNEG, rNEG, rBITDIF /* rNEG has LS bit that differs. */
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- cntlzd rNEG, rNEG /* bitcount of the bit. */
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- andi. rNEG, rNEG, 56 /* bitcount to LS byte that differs. */
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- sld rWORD1, rWORD1, rNEG /* shift left to clear MS bytes. */
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- sld rWORD2, rWORD2, rNEG
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- xor. rBITDIF, rWORD1, rWORD2
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- sub rRTN, rWORD1, rWORD2
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- blt- L(highbit)
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- sradi rRTN, rRTN, 63 /* must return an int. */
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- ori rRTN, rRTN, 1
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- blr
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-L(equal):
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- li rRTN, 0
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- blr
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-
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-L(different):
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- ld rWORD1, -8(rSTR1)
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- xor rBITDIF, rWORD1, rWORD2 /* rBITDIF has bits that differ. */
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- neg rNEG, rBITDIF
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- and rNEG, rNEG, rBITDIF /* rNEG has LS bit that differs. */
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- cntlzd rNEG, rNEG /* bitcount of the bit. */
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- andi. rNEG, rNEG, 56 /* bitcount to LS byte that differs. */
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- sld rWORD1, rWORD1, rNEG /* shift left to clear MS bytes. */
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- sld rWORD2, rWORD2, rNEG
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- xor. rBITDIF, rWORD1, rWORD2
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- sub rRTN, rWORD1, rWORD2
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- blt- L(highbit)
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- sradi rRTN, rRTN, 63
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- ori rRTN, rRTN, 1
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- blr
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-L(highbit):
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- sradi rRTN, rWORD2, 63
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- ori rRTN, rRTN, 1
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- blr
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-
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-#else
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-L(endstring):
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- and rTMP, r7F7F, rWORD1
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- beq cr1, L(equal)
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- add rTMP, rTMP, r7F7F
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- xor. rBITDIF, rWORD1, rWORD2
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- andc rNEG, rNEG, rTMP
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- blt- L(highbit)
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- cntlzd rBITDIF, rBITDIF
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- cntlzd rNEG, rNEG
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- addi rNEG, rNEG, 7
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- cmpd cr1, rNEG, rBITDIF
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- sub rRTN, rWORD1, rWORD2
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- blt- cr1, L(equal)
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- sradi rRTN, rRTN, 63 /* must return an int. */
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- ori rRTN, rRTN, 1
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- blr
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-L(equal):
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- li rRTN, 0
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- blr
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-
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-L(different):
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- ld rWORD1, -8(rSTR1)
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- xor. rBITDIF, rWORD1, rWORD2
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- sub rRTN, rWORD1, rWORD2
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- blt- L(highbit)
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- sradi rRTN, rRTN, 63
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- ori rRTN, rRTN, 1
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- blr
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-L(highbit):
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- sradi rRTN, rWORD2, 63
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- ori rRTN, rRTN, 1
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- blr
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-#endif
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-
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-/* Oh well. In this case, we just do a byte-by-byte comparison. */
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- .align 4
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-L(tail):
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- and. rTMP, rTMP, rNEG
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- cmpd cr1, rWORD1, rWORD2
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- bne- L(endstring)
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- addi rSTR1, rSTR1, 8
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- bne- cr1, L(different)
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- addi rSTR2, rSTR2, 8
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- cmpldi cr1, rN, 0
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-L(unaligned):
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- mtctr rN /* Power4 wants mtctr 1st in dispatch group */
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- bgt cr1, L(uz)
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-L(ux):
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- li rRTN, 0
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- blr
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- .align 4
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-L(uz):
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- lbz rWORD1, 0(rSTR1)
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- lbz rWORD2, 0(rSTR2)
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- nop
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- b L(u1)
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-L(u0):
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- lbzu rWORD2, 1(rSTR2)
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-L(u1):
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- bdz L(u3)
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- cmpdi cr1, rWORD1, 0
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- cmpd rWORD1, rWORD2
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- beq- cr1, L(u3)
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- lbzu rWORD1, 1(rSTR1)
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- bne- L(u2)
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- lbzu rWORD2, 1(rSTR2)
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- bdz L(u3)
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- cmpdi cr1, rWORD1, 0
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- cmpd rWORD1, rWORD2
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- bne- L(u3)
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- lbzu rWORD1, 1(rSTR1)
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- bne+ cr1, L(u0)
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-
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-L(u2): lbzu rWORD1, -1(rSTR1)
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-L(u3): sub rRTN, rWORD1, rWORD2
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- blr
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-END (STRNCMP)
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-libc_hidden_builtin_def (strncmp)
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