11.5.0-3
Honor -frounding-math in real truncation (PR middle-end/57245) Resolves: RHEL-73749
This commit is contained in:
Marek Polacek
parent
33c7fdbe53
commit
961c747afd
7
gcc.spec
7
gcc.spec
@ -4,7 +4,7 @@
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%global gcc_major 11
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# Note, gcc_release must be integer, if you want to add suffixes to
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# %%{release}, append them after %%{gcc_release} on Release: line.
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%global gcc_release 2
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%global gcc_release 3
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%global nvptx_tools_gitrev 5f6f343a302d620b0868edab376c00b15741e39e
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%global newlib_cygwin_gitrev 50e2a63b04bdd018484605fbb954fd1bd5147fa0
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%global _unpackaged_files_terminate_build 0
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@ -299,6 +299,7 @@ Patch36: gcc11-libgfortran-flush.patch
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Patch37: gcc11-pr113960.patch
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Patch38: gcc11-pr105157.patch
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Patch39: gcc11-testsuite-fixes-4.patch
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Patch40: gcc11-pr57245.patch
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Patch100: gcc11-fortran-fdec-duplicates.patch
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Patch101: gcc11-fortran-flogical-as-integer.patch
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@ -903,6 +904,7 @@ mark them as cross compiled.
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%patch37 -p1 -b .pr113960~
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%patch38 -p1 -b .pr105157~
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%patch39 -p1 -b .testsuite4~
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%patch40 -p1 -b .pr57245~
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%if 0%{?rhel} >= 9
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%patch100 -p1 -b .fortran-fdec-duplicates~
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@ -3596,6 +3598,9 @@ end
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%endif
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%changelog
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* Tue Jan 21 2025 Marek Polacek <polacek@redhat.com> 11.5.0-3
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- honor -frounding-math in real truncation (PR middle-end/57245, RHEL-73749)
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* Mon Jul 22 2024 Marek Polacek <polacek@redhat.com> 11.5.0-2
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- fix TARGET_CPU_DEFAULT (PR target/105157, RHEL-50037)
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- libstdc++: Workaround kernel-headers on s390x-linux (RHEL-50054)
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99
gcc11-pr57245.patch
Normal file
99
gcc11-pr57245.patch
Normal file
@ -0,0 +1,99 @@
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commit a84b9d5373c7e67fd0ab2a412c22162cdf969c91
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Author: Richard Biener <rguenther@suse.de>
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Date: Wed Oct 27 14:27:40 2021 +0200
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middle-end/57245 - honor -frounding-math in real truncation
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The following honors -frounding-math when converting a FP constant
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to another FP type.
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2021-10-27 Richard Biener <rguenther@suse.de>
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PR middle-end/57245
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* fold-const.c (fold_convert_const_real_from_real): Honor
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-frounding-math if the conversion is not exact.
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* simplify-rtx.c (simplify_const_unary_operation): Do not
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simplify FLOAT_TRUNCATE with sign dependent rounding.
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* gcc.dg/torture/fp-double-convert-float-1.c: New testcase.
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diff --git a/gcc/fold-const.c b/gcc/fold-const.c
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index ff23f12f33c..18950aeb760 100644
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--- a/gcc/fold-const.c
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+++ b/gcc/fold-const.c
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@@ -2139,6 +2139,12 @@ fold_convert_const_real_from_real (tree type, const_tree arg1)
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&& REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg1)))
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return NULL_TREE;
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+ /* With flag_rounding_math we should respect the current rounding mode
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+ unless the conversion is exact. */
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+ if (HONOR_SIGN_DEPENDENT_ROUNDING (arg1)
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+ && !exact_real_truncate (TYPE_MODE (type), &TREE_REAL_CST (arg1)))
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+ return NULL_TREE;
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+
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real_convert (&value, TYPE_MODE (type), &TREE_REAL_CST (arg1));
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t = build_real (type, value);
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diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
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index bbbd6b74942..f38b6d7d31c 100644
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--- a/gcc/simplify-rtx.c
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+++ b/gcc/simplify-rtx.c
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@@ -2068,6 +2068,11 @@ simplify_const_unary_operation (enum rtx_code code, machine_mode mode,
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and the operand is a signaling NaN. */
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if (HONOR_SNANS (mode) && REAL_VALUE_ISSIGNALING_NAN (d))
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return NULL_RTX;
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+ /* Or if flag_rounding_math is on and the truncation is not
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+ exact. */
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+ if (HONOR_SIGN_DEPENDENT_ROUNDING (mode)
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+ && !exact_real_truncate (mode, &d))
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+ return NULL_RTX;
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d = real_value_truncate (mode, d);
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break;
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case FLOAT_EXTEND:
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diff --git a/gcc/testsuite/gcc.dg/torture/fp-double-convert-float-1.c b/gcc/testsuite/gcc.dg/torture/fp-double-convert-float-1.c
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new file mode 100644
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index 00000000000..ec23274ea98
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/torture/fp-double-convert-float-1.c
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@@ -0,0 +1,41 @@
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+/* PR57245 */
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+/* { dg-do run } */
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+/* { dg-require-effective-target fenv } */
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+/* { dg-additional-options "-frounding-math" } */
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+
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+#include <fenv.h>
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+#include <stdlib.h>
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+
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+int
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+main ()
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+{
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+#if __DBL_MANT_DIG__ == 53 && __FLT_MANT_DIG__ == 24
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+#ifdef FE_UPWARD
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+ fesetround (FE_UPWARD);
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+ float f = 1.3;
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+ if (f != 0x1.4ccccep+0f)
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+ __builtin_abort ();
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+#endif
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+#ifdef FE_TONEAREST
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+ fesetround (FE_TONEAREST);
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+ /* Use different actual values so the bogus CSE we perform does not
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+ break things. */
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+ f = 1.33;
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+ if (f != 0x1.547ae2p+0f)
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+ abort ();
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+#endif
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+#ifdef FE_DOWNWARD
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+ fesetround (FE_DOWNWARD);
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+ f = 1.333;
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+ if (f != 0x1.553f7cp+0f)
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+ abort ();
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+#endif
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+#ifdef FE_TOWARDZERO
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+ fesetround (FE_TOWARDZERO);
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+ f = 1.3333;
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+ if (f != 0x1.555326p+0f)
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+ abort ();
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+#endif
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+#endif
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+ return 0;
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+}
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