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Fix wrong RTL patterns for vector merge high/low word on LE

Resolves: RHEL-45190
This commit is contained in:
Marek Polacek 2024-07-12 15:31:17 -04:00
parent dc34f0f024
commit eb340f89b3
4 changed files with 1078 additions and 1 deletions
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11
gcc.spec
View File

@ -149,7 +149,7 @@ BuildRequires: scl-utils-build
Summary: GCC version %{gcc_major}
Name: %{?scl_prefix}gcc
Version: %{gcc_version}
Release: %{gcc_release}%{?dist}
Release: %{gcc_release}.1%{?dist}
# libgcc, libgfortran, libgomp, libstdc++ and crtstuff have
# GCC Runtime Exception.
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ with exceptions and LGPLv2+ and BSD
@ -331,6 +331,9 @@ Patch10: gcc13-rh1574936.patch
Patch11: gcc13-d-shared-libphobos.patch
Patch12: gcc13-znver5.patch
Patch13: gcc13-pr107071.patch
Patch14: gcc13-vector-merge-1.patch
Patch15: gcc13-vector-merge-2.patch
Patch16: gcc13-vector-merge-3.patch
Patch50: isl-rh2155127.patch
@ -698,6 +701,9 @@ so that there cannot be any synchronization problems.
%patch -P11 -p0 -b .d-shared-libphobos~
%patch -P12 -p1 -b .znver5~
%patch -P13 -p1 -b .pr107071~
%patch -P14 -p1 -b .vector-merge-1~
%patch -P15 -p1 -b .vector-merge-2~
%patch -P16 -p1 -b .vector-merge-3~
%if 0%{?rhel} >= 6
%patch -P100 -p1 -b .fortran-fdec-duplicates~
@ -2909,6 +2915,9 @@ fi
%endif
%changelog
* Fri Jul 12 2024 Marek Polacek <polacek@redhat.com> 13.3.1-2.1
- fix wrong RTL patterns for vector merge high/low word on LE (RHEL-45190)
* Tue Jun 11 2024 Marek Polacek <polacek@redhat.com> 13.3.1-2
- update from releases/gcc-13 branch
- PRs ada/114398, ada/114708, c/114493, c++/111529, c++/113598,

522
gcc13-vector-merge-1.patch Normal file
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@ -0,0 +1,522 @@
commit 361bfcec901ca882130e338aebaa2ebc6ea2dc3b
Author: Kewen Lin <linkw@linux.ibm.com>
Date: Thu Jun 20 20:23:56 2024 -0500
rs6000: Fix wrong RTL patterns for vector merge high/low word on LE
Commit r12-4496 changes some define_expands and define_insns
for vector merge high/low word, which are altivec_vmrg[hl]w,
vsx_xxmrg[hl]w_<VSX_W:mode>. These defines are mainly for
built-in function vec_merge{h,l}, __builtin_vsx_xxmrghw,
__builtin_vsx_xxmrghw_4si and some internal gen function
needs. These functions should consider endianness, taking
vec_mergeh as example, as PVIPR defines, vec_mergeh "Merges
the first halves (in element order) of two vectors", it does
note it's in element order. So it's mapped into vmrghw on
BE while vmrglw on LE respectively. Although the mapped
insns are different, as the discussion in PR106069, the RTL
pattern should be still the same, it is conformed before
commit r12-4496, define_expand altivec_vmrghw got expanded
into:
(vec_select:VSX_W
(vec_concat:<VS_double>
(match_operand:VSX_W 1 "register_operand" "wa,v")
(match_operand:VSX_W 2 "register_operand" "wa,v"))
(parallel [(const_int 0) (const_int 4)
(const_int 1) (const_int 5)])))]
on both BE and LE then. But commit r12-4496 changed it to
expand into:
(vec_select:VSX_W
(vec_concat:<VS_double>
(match_operand:VSX_W 1 "register_operand" "wa,v")
(match_operand:VSX_W 2 "register_operand" "wa,v"))
(parallel [(const_int 0) (const_int 4)
(const_int 1) (const_int 5)])))]
on BE, and
(vec_select:VSX_W
(vec_concat:<VS_double>
(match_operand:VSX_W 1 "register_operand" "wa,v")
(match_operand:VSX_W 2 "register_operand" "wa,v"))
(parallel [(const_int 2) (const_int 6)
(const_int 3) (const_int 7)])))]
on LE, although the mapped insn are still vmrghw on BE and
vmrglw on LE, the associated RTL pattern is completely
wrong and inconsistent with the mapped insn. If optimization
passes leave this pattern alone, even if its pattern doesn't
represent its mapped insn, it's still fine, that's why simple
testing on bif doesn't expose this issue. But once some
optimization pass such as combine does some changes basing
on this wrong pattern, because the pattern doesn't match the
semantics that the expanded insn is intended to represent,
it would cause the unexpected result.
So this patch is to fix the wrong RTL pattern, ensure the
associated RTL patterns become the same as before which can
have the same semantic as their mapped insns. With the
proposed patch, the expanders like altivec_vmrghw expands
into altivec_vmrghb_direct_be or altivec_vmrglb_direct_le
depending on endianness, "direct" can easily show which
insn would be generated, _be and _le are mainly for the
different RTL patterns as endianness.
Co-authored-by: Xionghu Luo <xionghuluo@tencent.com>
PR target/106069
PR target/115355
gcc/ChangeLog:
* config/rs6000/altivec.md (altivec_vmrghw_direct_<VSX_W:mode>): Rename
to ...
(altivec_vmrghw_direct_<VSX_W:mode>_be): ... this. Add the condition
BYTES_BIG_ENDIAN.
(altivec_vmrghw_direct_<VSX_W:mode>_le): New define_insn.
(altivec_vmrglw_direct_<VSX_W:mode>): Rename to ...
(altivec_vmrglw_direct_<VSX_W:mode>_be): ... this. Add the condition
BYTES_BIG_ENDIAN.
(altivec_vmrglw_direct_<VSX_W:mode>_le): New define_insn.
(altivec_vmrghw): Adjust by calling gen_altivec_vmrghw_direct_v4si_be
for BE and gen_altivec_vmrglw_direct_v4si_le for LE.
(altivec_vmrglw): Adjust by calling gen_altivec_vmrglw_direct_v4si_be
for BE and gen_altivec_vmrghw_direct_v4si_le for LE.
(vec_widen_umult_hi_v8hi): Adjust the call to
gen_altivec_vmrghw_direct_v4si by gen_altivec_vmrghw for BE
and by gen_altivec_vmrglw for LE.
(vec_widen_smult_hi_v8hi): Likewise.
(vec_widen_umult_lo_v8hi): Adjust the call to
gen_altivec_vmrglw_direct_v4si by gen_altivec_vmrglw for BE
and by gen_altivec_vmrghw for LE
(vec_widen_smult_lo_v8hi): Likewise.
* config/rs6000/rs6000.cc (altivec_expand_vec_perm_const): Replace
CODE_FOR_altivec_vmrghw_direct_v4si by
CODE_FOR_altivec_vmrghw_direct_v4si_be for BE and
CODE_FOR_altivec_vmrghw_direct_v4si_le for LE. And replace
CODE_FOR_altivec_vmrglw_direct_v4si by
CODE_FOR_altivec_vmrglw_direct_v4si_be for BE and
CODE_FOR_altivec_vmrglw_direct_v4si_le for LE.
* config/rs6000/vsx.md (vsx_xxmrghw_<VSX_W:mode>): Adjust by calling
gen_altivec_vmrghw_direct_v4si_be for BE and
gen_altivec_vmrglw_direct_v4si_le for LE.
(vsx_xxmrglw_<VSX_W:mode>): Adjust by calling
gen_altivec_vmrglw_direct_v4si_be for BE and
gen_altivec_vmrghw_direct_v4si_le for LE.
gcc/testsuite/ChangeLog:
* g++.target/powerpc/pr106069.C: New test.
* gcc.target/powerpc/pr115355.c: New test.
(cherry picked from commit 52c112800d9f44457c4832309a48c00945811313)
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index ad1224e0b57..92e2e4a4090 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -1212,16 +1212,18 @@ (define_expand "altivec_vmrghw"
(use (match_operand:V4SI 2 "register_operand"))]
"VECTOR_MEM_ALTIVEC_P (V4SImode)"
{
- rtx (*fun) (rtx, rtx, rtx);
- fun = BYTES_BIG_ENDIAN ? gen_altivec_vmrghw_direct_v4si
- : gen_altivec_vmrglw_direct_v4si;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (gen_altivec_vmrghw_direct_v4si_be (operands[0],
+ operands[1],
+ operands[2]));
+ else
+ emit_insn (gen_altivec_vmrglw_direct_v4si_le (operands[0],
+ operands[2],
+ operands[1]));
DONE;
})
-(define_insn "altivec_vmrghw_direct_<mode>"
+(define_insn "altivec_vmrghw_direct_<mode>_be"
[(set (match_operand:VSX_W 0 "register_operand" "=wa,v")
(vec_select:VSX_W
(vec_concat:<VS_double>
@@ -1229,7 +1231,21 @@ (define_insn "altivec_vmrghw_direct_<mode>"
(match_operand:VSX_W 2 "register_operand" "wa,v"))
(parallel [(const_int 0) (const_int 4)
(const_int 1) (const_int 5)])))]
- "TARGET_ALTIVEC"
+ "TARGET_ALTIVEC && BYTES_BIG_ENDIAN"
+ "@
+ xxmrghw %x0,%x1,%x2
+ vmrghw %0,%1,%2"
+ [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vmrghw_direct_<mode>_le"
+ [(set (match_operand:VSX_W 0 "register_operand" "=wa,v")
+ (vec_select:VSX_W
+ (vec_concat:<VS_double>
+ (match_operand:VSX_W 2 "register_operand" "wa,v")
+ (match_operand:VSX_W 1 "register_operand" "wa,v"))
+ (parallel [(const_int 2) (const_int 6)
+ (const_int 3) (const_int 7)])))]
+ "TARGET_ALTIVEC && !BYTES_BIG_ENDIAN"
"@
xxmrghw %x0,%x1,%x2
vmrghw %0,%1,%2"
@@ -1318,16 +1334,18 @@ (define_expand "altivec_vmrglw"
(use (match_operand:V4SI 2 "register_operand"))]
"VECTOR_MEM_ALTIVEC_P (V4SImode)"
{
- rtx (*fun) (rtx, rtx, rtx);
- fun = BYTES_BIG_ENDIAN ? gen_altivec_vmrglw_direct_v4si
- : gen_altivec_vmrghw_direct_v4si;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (gen_altivec_vmrglw_direct_v4si_be (operands[0],
+ operands[1],
+ operands[2]));
+ else
+ emit_insn (gen_altivec_vmrghw_direct_v4si_le (operands[0],
+ operands[2],
+ operands[1]));
DONE;
})
-(define_insn "altivec_vmrglw_direct_<mode>"
+(define_insn "altivec_vmrglw_direct_<mode>_be"
[(set (match_operand:VSX_W 0 "register_operand" "=wa,v")
(vec_select:VSX_W
(vec_concat:<VS_double>
@@ -1335,7 +1353,21 @@ (define_insn "altivec_vmrglw_direct_<mode>"
(match_operand:VSX_W 2 "register_operand" "wa,v"))
(parallel [(const_int 2) (const_int 6)
(const_int 3) (const_int 7)])))]
- "TARGET_ALTIVEC"
+ "TARGET_ALTIVEC && BYTES_BIG_ENDIAN"
+ "@
+ xxmrglw %x0,%x1,%x2
+ vmrglw %0,%1,%2"
+ [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vmrglw_direct_<mode>_le"
+ [(set (match_operand:VSX_W 0 "register_operand" "=wa,v")
+ (vec_select:VSX_W
+ (vec_concat:<VS_double>
+ (match_operand:VSX_W 2 "register_operand" "wa,v")
+ (match_operand:VSX_W 1 "register_operand" "wa,v"))
+ (parallel [(const_int 0) (const_int 4)
+ (const_int 1) (const_int 5)])))]
+ "TARGET_ALTIVEC && !BYTES_BIG_ENDIAN"
"@
xxmrglw %x0,%x1,%x2
vmrglw %0,%1,%2"
@@ -3807,13 +3839,13 @@ (define_expand "vec_widen_umult_hi_v8hi"
{
emit_insn (gen_altivec_vmuleuh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulouh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghw_direct_v4si (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrghw (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmulouh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmuleuh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghw_direct_v4si (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrglw (operands[0], ve, vo));
}
DONE;
})
@@ -3832,13 +3864,13 @@ (define_expand "vec_widen_umult_lo_v8hi"
{
emit_insn (gen_altivec_vmuleuh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulouh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglw_direct_v4si (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrglw (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmulouh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmuleuh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglw_direct_v4si (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrghw (operands[0], ve, vo));
}
DONE;
})
@@ -3857,13 +3889,13 @@ (define_expand "vec_widen_smult_hi_v8hi"
{
emit_insn (gen_altivec_vmulesh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulosh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghw_direct_v4si (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrghw (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmulosh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulesh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghw_direct_v4si (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrglw (operands[0], ve, vo));
}
DONE;
})
@@ -3882,13 +3914,13 @@ (define_expand "vec_widen_smult_lo_v8hi"
{
emit_insn (gen_altivec_vmulesh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulosh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglw_direct_v4si (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrglw (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmulosh (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulesh (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglw_direct_v4si (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrghw (operands[0], ve, vo));
}
DONE;
})
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 9cfde1a52ea..b3d648312f1 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -23174,8 +23174,8 @@ altivec_expand_vec_perm_const (rtx target, rtx op0, rtx op1,
: CODE_FOR_altivec_vmrglh_direct,
{0, 1, 16, 17, 2, 3, 18, 19, 4, 5, 20, 21, 6, 7, 22, 23}},
{OPTION_MASK_ALTIVEC,
- BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghw_direct_v4si
- : CODE_FOR_altivec_vmrglw_direct_v4si,
+ BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghw_direct_v4si_be
+ : CODE_FOR_altivec_vmrglw_direct_v4si_le,
{0, 1, 2, 3, 16, 17, 18, 19, 4, 5, 6, 7, 20, 21, 22, 23}},
{OPTION_MASK_ALTIVEC,
BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglb_direct
@@ -23186,8 +23186,8 @@ altivec_expand_vec_perm_const (rtx target, rtx op0, rtx op1,
: CODE_FOR_altivec_vmrghh_direct,
{8, 9, 24, 25, 10, 11, 26, 27, 12, 13, 28, 29, 14, 15, 30, 31}},
{OPTION_MASK_ALTIVEC,
- BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglw_direct_v4si
- : CODE_FOR_altivec_vmrghw_direct_v4si,
+ BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglw_direct_v4si_be
+ : CODE_FOR_altivec_vmrghw_direct_v4si_le,
{8, 9, 10, 11, 24, 25, 26, 27, 12, 13, 14, 15, 28, 29, 30, 31}},
{OPTION_MASK_P8_VECTOR,
BYTES_BIG_ENDIAN ? CODE_FOR_p8_vmrgew_v4sf_direct
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index f70d69ee4b9..b9a1bfb5c16 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -4683,12 +4683,14 @@ (define_expand "vsx_xxmrghw_<mode>"
(const_int 1) (const_int 5)])))]
"VECTOR_MEM_VSX_P (<MODE>mode)"
{
- rtx (*fun) (rtx, rtx, rtx);
- fun = BYTES_BIG_ENDIAN ? gen_altivec_vmrghw_direct_<mode>
- : gen_altivec_vmrglw_direct_<mode>;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (gen_altivec_vmrghw_direct_v4si_be (operands[0],
+ operands[1],
+ operands[2]));
+ else
+ emit_insn (gen_altivec_vmrglw_direct_v4si_le (operands[0],
+ operands[2],
+ operands[1]));
DONE;
}
[(set_attr "type" "vecperm")])
@@ -4703,12 +4705,14 @@ (define_expand "vsx_xxmrglw_<mode>"
(const_int 3) (const_int 7)])))]
"VECTOR_MEM_VSX_P (<MODE>mode)"
{
- rtx (*fun) (rtx, rtx, rtx);
- fun = BYTES_BIG_ENDIAN ? gen_altivec_vmrglw_direct_<mode>
- : gen_altivec_vmrghw_direct_<mode>;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (gen_altivec_vmrglw_direct_v4si_be (operands[0],
+ operands[1],
+ operands[2]));
+ else
+ emit_insn (gen_altivec_vmrghw_direct_v4si_le (operands[0],
+ operands[2],
+ operands[1]));
DONE;
}
[(set_attr "type" "vecperm")])
diff --git a/gcc/testsuite/g++.target/powerpc/pr106069.C b/gcc/testsuite/g++.target/powerpc/pr106069.C
new file mode 100644
index 00000000000..537207d2fe8
--- /dev/null
+++ b/gcc/testsuite/g++.target/powerpc/pr106069.C
@@ -0,0 +1,119 @@
+/* { dg-options "-O -fno-tree-forwprop -maltivec" } */
+/* { dg-require-effective-target vmx_hw } */
+/* { dg-do run } */
+
+typedef __attribute__ ((altivec (vector__))) unsigned native_simd_type;
+
+union
+{
+ native_simd_type V;
+ int R[4];
+} store_le_vec;
+
+struct S
+{
+ S () = default;
+ S (unsigned B0)
+ {
+ native_simd_type val{B0};
+ m_simd = val;
+ }
+ void store_le (unsigned int out[])
+ {
+ store_le_vec.V = m_simd;
+ unsigned int x0 = store_le_vec.R[0];
+ __builtin_memcpy (out, &x0, 4);
+ }
+ S rotl (unsigned int r)
+ {
+ native_simd_type rot{r};
+ return __builtin_vec_rl (m_simd, rot);
+ }
+ void operator+= (S other)
+ {
+ m_simd = __builtin_vec_add (m_simd, other.m_simd);
+ }
+ void operator^= (S other)
+ {
+ m_simd = __builtin_vec_xor (m_simd, other.m_simd);
+ }
+ static void transpose (S &B0, S B1, S B2, S B3)
+ {
+ native_simd_type T0 = __builtin_vec_mergeh (B0.m_simd, B2.m_simd);
+ native_simd_type T1 = __builtin_vec_mergeh (B1.m_simd, B3.m_simd);
+ native_simd_type T2 = __builtin_vec_mergel (B0.m_simd, B2.m_simd);
+ native_simd_type T3 = __builtin_vec_mergel (B1.m_simd, B3.m_simd);
+ B0 = __builtin_vec_mergeh (T0, T1);
+ B3 = __builtin_vec_mergel (T2, T3);
+ }
+ S (native_simd_type x) : m_simd (x) {}
+ native_simd_type m_simd;
+};
+
+void
+foo (unsigned int output[], unsigned state[])
+{
+ S R00 = state[0];
+ S R01 = state[0];
+ S R02 = state[2];
+ S R03 = state[0];
+ S R05 = state[5];
+ S R06 = state[6];
+ S R07 = state[7];
+ S R08 = state[8];
+ S R09 = state[9];
+ S R10 = state[10];
+ S R11 = state[11];
+ S R12 = state[12];
+ S R13 = state[13];
+ S R14 = state[4];
+ S R15 = state[15];
+ for (int r = 0; r != 10; ++r)
+ {
+ R09 += R13;
+ R11 += R15;
+ R05 ^= R09;
+ R06 ^= R10;
+ R07 ^= R11;
+ R07 = R07.rotl (7);
+ R00 += R05;
+ R01 += R06;
+ R02 += R07;
+ R15 ^= R00;
+ R12 ^= R01;
+ R13 ^= R02;
+ R00 += R05;
+ R01 += R06;
+ R02 += R07;
+ R15 ^= R00;
+ R12 = R12.rotl (8);
+ R13 = R13.rotl (8);
+ R10 += R15;
+ R11 += R12;
+ R08 += R13;
+ R09 += R14;
+ R05 ^= R10;
+ R06 ^= R11;
+ R07 ^= R08;
+ R05 = R05.rotl (7);
+ R06 = R06.rotl (7);
+ R07 = R07.rotl (7);
+ }
+ R00 += state[0];
+ S::transpose (R00, R01, R02, R03);
+ R00.store_le (output);
+}
+
+unsigned int res[1];
+unsigned main_state[]{1634760805, 60878, 2036477234, 6,
+ 0, 825562964, 1471091955, 1346092787,
+ 506976774, 4197066702, 518848283, 118491664,
+ 0, 0, 0, 0};
+int
+main ()
+{
+ foo (res, main_state);
+ if (res[0] != 0x41fcef98)
+ __builtin_abort ();
+ return 0;
+}
diff --git a/gcc/testsuite/gcc.target/powerpc/pr115355.c b/gcc/testsuite/gcc.target/powerpc/pr115355.c
new file mode 100644
index 00000000000..8955126b808
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr115355.c
@@ -0,0 +1,37 @@
+/* { dg-do run } */
+/* { dg-require-effective-target p9vector_hw } */
+/* Force vectorization with -fno-vect-cost-model to have vector unpack
+ which exposes the issue in PR115355. */
+/* { dg-options "-O2 -mdejagnu-cpu=power9 -fno-vect-cost-model" } */
+
+/* Verify it runs successfully. */
+
+__attribute__((noipa))
+void setToIdentityGOOD(unsigned long long *mVec, unsigned int mLen)
+{
+ #pragma GCC novector
+ for (unsigned int i = 0; i < mLen; i++)
+ mVec[i] = i;
+}
+
+__attribute__((noipa))
+void setToIdentityBAD(unsigned long long *mVec, unsigned int mLen)
+{
+ for (unsigned int i = 0; i < mLen; i++)
+ mVec[i] = i;
+}
+
+unsigned long long vec1[100];
+unsigned long long vec2[100];
+
+int main()
+{
+ unsigned int l = 29;
+ setToIdentityGOOD (vec1, 29);
+ setToIdentityBAD (vec2, 29);
+
+ if (__builtin_memcmp (vec1, vec2, l * sizeof (vec1[0])) != 0)
+ __builtin_abort ();
+
+ return 0;
+}

240
gcc13-vector-merge-2.patch Normal file
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@ -0,0 +1,240 @@
commit ffdd377fc07cdc7b62669d354e23f30940eaaffe
Author: Kewen Lin <linkw@linux.ibm.com>
Date: Wed Jun 26 02:16:17 2024 -0500
rs6000: Fix wrong RTL patterns for vector merge high/low char on LE
Commit r12-4496 changes some define_expands and define_insns
for vector merge high/low char, which are altivec_vmrg[hl]b.
These defines are mainly for built-in function vec_merge{h,l}
and some internal gen function needs. These functions should
consider endianness, taking vec_mergeh as example, as PVIPR
defines, vec_mergeh "Merges the first halves (in element order)
of two vectors", it does note it's in element order. So it's
mapped into vmrghb on BE while vmrglb on LE respectively.
Although the mapped insns are different, as the discussion in
PR106069, the RTL pattern should be still the same, it is
conformed before commit r12-4496, but gets changed into
different patterns on BE and LE starting from commit r12-4496.
Similar to 32-bit element case in commit log of r15-1504, this
8-bit element pattern on LE doesn't actually match what the
underlying insn is intended to represent, once some optimization
like combine does some changes basing on it, it would cause
the unexpected consequence. The newly constructed test case
pr106069-1.c is a typical example for this issue.
So this patch is to fix the wrong RTL pattern, ensure the
associated RTL patterns become the same as before which can
have the same semantic as their mapped insns. With the
proposed patch, the expanders like altivec_vmrghb expands
into altivec_vmrghb_direct_be or altivec_vmrglb_direct_le
depending on endianness, "direct" can easily show which
insn would be generated, _be and _le are mainly for the
different RTL patterns as endianness.
Co-authored-by: Xionghu Luo <xionghuluo@tencent.com>
PR target/106069
PR target/115355
gcc/ChangeLog:
* config/rs6000/altivec.md (altivec_vmrghb_direct): Rename to ...
(altivec_vmrghb_direct_be): ... this. Add condition BYTES_BIG_ENDIAN.
(altivec_vmrghb_direct_le): New define_insn.
(altivec_vmrglb_direct): Rename to ...
(altivec_vmrglb_direct_be): ... this. Add condition BYTES_BIG_ENDIAN.
(altivec_vmrglb_direct_le): New define_insn.
(altivec_vmrghb): Adjust by calling gen_altivec_vmrghb_direct_be
for BE and gen_altivec_vmrglb_direct_le for LE.
(altivec_vmrglb): Adjust by calling gen_altivec_vmrglb_direct_be
for BE and gen_altivec_vmrghb_direct_le for LE.
* config/rs6000/rs6000.cc (altivec_expand_vec_perm_const): Replace
CODE_FOR_altivec_vmrghb_direct by
CODE_FOR_altivec_vmrghb_direct_be for BE and
CODE_FOR_altivec_vmrghb_direct_le for LE. And replace
CODE_FOR_altivec_vmrglb_direct by
CODE_FOR_altivec_vmrglb_direct_be for BE and
CODE_FOR_altivec_vmrglb_direct_le for LE.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr106069-1.c: New test.
(cherry picked from commit 62520e4e9f7e2fe8a16ee57a4bd35da2e921ae22)
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index 92e2e4a4090..47664204bc5 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -1152,15 +1152,16 @@ (define_expand "altivec_vmrghb"
(use (match_operand:V16QI 2 "register_operand"))]
"TARGET_ALTIVEC"
{
- rtx (*fun) (rtx, rtx, rtx) = BYTES_BIG_ENDIAN ? gen_altivec_vmrghb_direct
- : gen_altivec_vmrglb_direct;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (
+ gen_altivec_vmrghb_direct_be (operands[0], operands[1], operands[2]));
+ else
+ emit_insn (
+ gen_altivec_vmrglb_direct_le (operands[0], operands[2], operands[1]));
DONE;
})
-(define_insn "altivec_vmrghb_direct"
+(define_insn "altivec_vmrghb_direct_be"
[(set (match_operand:V16QI 0 "register_operand" "=v")
(vec_select:V16QI
(vec_concat:V32QI
@@ -1174,7 +1175,25 @@ (define_insn "altivec_vmrghb_direct"
(const_int 5) (const_int 21)
(const_int 6) (const_int 22)
(const_int 7) (const_int 23)])))]
- "TARGET_ALTIVEC"
+ "TARGET_ALTIVEC && BYTES_BIG_ENDIAN"
+ "vmrghb %0,%1,%2"
+ [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vmrghb_direct_le"
+ [(set (match_operand:V16QI 0 "register_operand" "=v")
+ (vec_select:V16QI
+ (vec_concat:V32QI
+ (match_operand:V16QI 2 "register_operand" "v")
+ (match_operand:V16QI 1 "register_operand" "v"))
+ (parallel [(const_int 8) (const_int 24)
+ (const_int 9) (const_int 25)
+ (const_int 10) (const_int 26)
+ (const_int 11) (const_int 27)
+ (const_int 12) (const_int 28)
+ (const_int 13) (const_int 29)
+ (const_int 14) (const_int 30)
+ (const_int 15) (const_int 31)])))]
+ "TARGET_ALTIVEC && !BYTES_BIG_ENDIAN"
"vmrghb %0,%1,%2"
[(set_attr "type" "vecperm")])
@@ -1274,15 +1293,16 @@ (define_expand "altivec_vmrglb"
(use (match_operand:V16QI 2 "register_operand"))]
"TARGET_ALTIVEC"
{
- rtx (*fun) (rtx, rtx, rtx) = BYTES_BIG_ENDIAN ? gen_altivec_vmrglb_direct
- : gen_altivec_vmrghb_direct;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (
+ gen_altivec_vmrglb_direct_be (operands[0], operands[1], operands[2]));
+ else
+ emit_insn (
+ gen_altivec_vmrghb_direct_le (operands[0], operands[2], operands[1]));
DONE;
})
-(define_insn "altivec_vmrglb_direct"
+(define_insn "altivec_vmrglb_direct_be"
[(set (match_operand:V16QI 0 "register_operand" "=v")
(vec_select:V16QI
(vec_concat:V32QI
@@ -1296,7 +1316,25 @@ (define_insn "altivec_vmrglb_direct"
(const_int 13) (const_int 29)
(const_int 14) (const_int 30)
(const_int 15) (const_int 31)])))]
- "TARGET_ALTIVEC"
+ "TARGET_ALTIVEC && BYTES_BIG_ENDIAN"
+ "vmrglb %0,%1,%2"
+ [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vmrglb_direct_le"
+ [(set (match_operand:V16QI 0 "register_operand" "=v")
+ (vec_select:V16QI
+ (vec_concat:V32QI
+ (match_operand:V16QI 2 "register_operand" "v")
+ (match_operand:V16QI 1 "register_operand" "v"))
+ (parallel [(const_int 0) (const_int 16)
+ (const_int 1) (const_int 17)
+ (const_int 2) (const_int 18)
+ (const_int 3) (const_int 19)
+ (const_int 4) (const_int 20)
+ (const_int 5) (const_int 21)
+ (const_int 6) (const_int 22)
+ (const_int 7) (const_int 23)])))]
+ "TARGET_ALTIVEC && !BYTES_BIG_ENDIAN"
"vmrglb %0,%1,%2"
[(set_attr "type" "vecperm")])
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index b3d648312f1..10088033aa1 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -23166,8 +23166,8 @@ altivec_expand_vec_perm_const (rtx target, rtx op0, rtx op1,
CODE_FOR_altivec_vpkuwum_direct,
{2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31}},
{OPTION_MASK_ALTIVEC,
- BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghb_direct
- : CODE_FOR_altivec_vmrglb_direct,
+ BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghb_direct_be
+ : CODE_FOR_altivec_vmrglb_direct_le,
{0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23}},
{OPTION_MASK_ALTIVEC,
BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghh_direct
@@ -23178,8 +23178,8 @@ altivec_expand_vec_perm_const (rtx target, rtx op0, rtx op1,
: CODE_FOR_altivec_vmrglw_direct_v4si_le,
{0, 1, 2, 3, 16, 17, 18, 19, 4, 5, 6, 7, 20, 21, 22, 23}},
{OPTION_MASK_ALTIVEC,
- BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglb_direct
- : CODE_FOR_altivec_vmrghb_direct,
+ BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglb_direct_be
+ : CODE_FOR_altivec_vmrghb_direct_le,
{8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31}},
{OPTION_MASK_ALTIVEC,
BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglh_direct
diff --git a/gcc/testsuite/gcc.target/powerpc/pr106069-1.c b/gcc/testsuite/gcc.target/powerpc/pr106069-1.c
new file mode 100644
index 00000000000..4945d8fedfb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr106069-1.c
@@ -0,0 +1,39 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-require-effective-target vmx_hw } */
+
+/* Test vector merge for 8-bit element size,
+ it will abort if the RTL pattern isn't expected. */
+
+#include "altivec.h"
+
+__attribute__((noipa))
+signed char elem_6 (vector signed char a, vector signed char b)
+{
+ vector signed char c = vec_mergeh (a,b);
+ return vec_extract (c, 6);
+}
+
+__attribute__((noipa))
+unsigned char elem_15 (vector unsigned char a, vector unsigned char b)
+{
+ vector unsigned char c = vec_mergel (a,b);
+ return vec_extract (c, 15);
+}
+
+int
+main ()
+{
+ vector unsigned char v1
+ = {3, 33, 22, 12, 34, 14, 5, 25, 30, 11, 0, 21, 17, 27, 38, 8};
+ vector unsigned char v2
+ = {81, 82, 83, 84, 68, 67, 66, 65, 99, 100, 101, 102, 250, 125, 0, 6};
+ signed char x1 = elem_6 ((vector signed char) v1, (vector signed char) v2);
+ unsigned char x2 = elem_15 (v1, v2);
+
+ if (x1 != 12 || x2 != 6)
+ __builtin_abort ();
+
+ return 0;
+}
+

306
gcc13-vector-merge-3.patch Normal file
View File

@ -0,0 +1,306 @@
commit bab38d9271ce3f26cb64b8cb712351eb3fedd559
Author: Kewen Lin <linkw@linux.ibm.com>
Date: Wed Jun 26 02:16:17 2024 -0500
rs6000: Fix wrong RTL patterns for vector merge high/low short on LE
Commit r12-4496 changes some define_expands and define_insns
for vector merge high/low short, which are altivec_vmrg[hl]h.
These defines are mainly for built-in function vec_merge{h,l}
and some internal gen function needs. These functions should
consider endianness, taking vec_mergeh as example, as PVIPR
defines, vec_mergeh "Merges the first halves (in element order)
of two vectors", it does note it's in element order. So it's
mapped into vmrghh on BE while vmrglh on LE respectively.
Although the mapped insns are different, as the discussion in
PR106069, the RTL pattern should be still the same, it is
conformed before commit r12-4496, but gets changed into
different patterns on BE and LE starting from commit r12-4496.
Similar to 32-bit element case in commit log of r15-1504, this
16-bit element pattern on LE doesn't actually match what the
underlying insn is intended to represent, once some optimization
like combine does some changes basing on it, it would cause
the unexpected consequence. The newly constructed test case
pr106069-2.c is a typical example for this issue on element type
short.
So this patch is to fix the wrong RTL pattern, ensure the
associated RTL patterns become the same as before which can
have the same semantic as their mapped insns. With the
proposed patch, the expanders like altivec_vmrghh expands
into altivec_vmrghh_direct_be or altivec_vmrglh_direct_le
depending on endianness, "direct" can easily show which
insn would be generated, _be and _le are mainly for the
different RTL patterns as endianness.
Co-authored-by: Xionghu Luo <xionghuluo@tencent.com>
PR target/106069
PR target/115355
gcc/ChangeLog:
* config/rs6000/altivec.md (altivec_vmrghh_direct): Rename to ...
(altivec_vmrghh_direct_be): ... this. Add condition BYTES_BIG_ENDIAN.
(altivec_vmrghh_direct_le): New define_insn.
(altivec_vmrglh_direct): Rename to ...
(altivec_vmrglh_direct_be): ... this. Add condition BYTES_BIG_ENDIAN.
(altivec_vmrglh_direct_le): New define_insn.
(altivec_vmrghh): Adjust by calling gen_altivec_vmrghh_direct_be
for BE and gen_altivec_vmrglh_direct_le for LE.
(altivec_vmrglh): Adjust by calling gen_altivec_vmrglh_direct_be
for BE and gen_altivec_vmrghh_direct_le for LE.
(vec_widen_umult_hi_v16qi): Adjust the call to
gen_altivec_vmrghh_direct by gen_altivec_vmrghh for BE
and by gen_altivec_vmrglh for LE.
(vec_widen_smult_hi_v16qi): Likewise.
(vec_widen_umult_lo_v16qi): Adjust the call to
gen_altivec_vmrglh_direct by gen_altivec_vmrglh for BE
and by gen_altivec_vmrghh for LE.
(vec_widen_smult_lo_v16qi): Likewise.
* config/rs6000/rs6000.cc (altivec_expand_vec_perm_const): Replace
CODE_FOR_altivec_vmrghh_direct by
CODE_FOR_altivec_vmrghh_direct_be for BE and
CODE_FOR_altivec_vmrghh_direct_le for LE. And replace
CODE_FOR_altivec_vmrglh_direct by
CODE_FOR_altivec_vmrglh_direct_be for BE and
CODE_FOR_altivec_vmrglh_direct_le for LE.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr106069-2.c: New test.
(cherry picked from commit 812c70bf4981958488331d4ea5af8709b5321da1)
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index 47664204bc5..6557393a97c 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -1203,17 +1203,18 @@ (define_expand "altivec_vmrghh"
(use (match_operand:V8HI 2 "register_operand"))]
"TARGET_ALTIVEC"
{
- rtx (*fun) (rtx, rtx, rtx) = BYTES_BIG_ENDIAN ? gen_altivec_vmrghh_direct
- : gen_altivec_vmrglh_direct;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (
+ gen_altivec_vmrghh_direct_be (operands[0], operands[1], operands[2]));
+ else
+ emit_insn (
+ gen_altivec_vmrglh_direct_le (operands[0], operands[2], operands[1]));
DONE;
})
-(define_insn "altivec_vmrghh_direct"
+(define_insn "altivec_vmrghh_direct_be"
[(set (match_operand:V8HI 0 "register_operand" "=v")
- (vec_select:V8HI
+ (vec_select:V8HI
(vec_concat:V16HI
(match_operand:V8HI 1 "register_operand" "v")
(match_operand:V8HI 2 "register_operand" "v"))
@@ -1221,7 +1222,21 @@ (define_insn "altivec_vmrghh_direct"
(const_int 1) (const_int 9)
(const_int 2) (const_int 10)
(const_int 3) (const_int 11)])))]
- "TARGET_ALTIVEC"
+ "TARGET_ALTIVEC && BYTES_BIG_ENDIAN"
+ "vmrghh %0,%1,%2"
+ [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vmrghh_direct_le"
+ [(set (match_operand:V8HI 0 "register_operand" "=v")
+ (vec_select:V8HI
+ (vec_concat:V16HI
+ (match_operand:V8HI 2 "register_operand" "v")
+ (match_operand:V8HI 1 "register_operand" "v"))
+ (parallel [(const_int 4) (const_int 12)
+ (const_int 5) (const_int 13)
+ (const_int 6) (const_int 14)
+ (const_int 7) (const_int 15)])))]
+ "TARGET_ALTIVEC && !BYTES_BIG_ENDIAN"
"vmrghh %0,%1,%2"
[(set_attr "type" "vecperm")])
@@ -1344,15 +1359,16 @@ (define_expand "altivec_vmrglh"
(use (match_operand:V8HI 2 "register_operand"))]
"TARGET_ALTIVEC"
{
- rtx (*fun) (rtx, rtx, rtx) = BYTES_BIG_ENDIAN ? gen_altivec_vmrglh_direct
- : gen_altivec_vmrghh_direct;
- if (!BYTES_BIG_ENDIAN)
- std::swap (operands[1], operands[2]);
- emit_insn (fun (operands[0], operands[1], operands[2]));
+ if (BYTES_BIG_ENDIAN)
+ emit_insn (
+ gen_altivec_vmrglh_direct_be (operands[0], operands[1], operands[2]));
+ else
+ emit_insn (
+ gen_altivec_vmrghh_direct_le (operands[0], operands[2], operands[1]));
DONE;
})
-(define_insn "altivec_vmrglh_direct"
+(define_insn "altivec_vmrglh_direct_be"
[(set (match_operand:V8HI 0 "register_operand" "=v")
(vec_select:V8HI
(vec_concat:V16HI
@@ -1362,7 +1378,21 @@ (define_insn "altivec_vmrglh_direct"
(const_int 5) (const_int 13)
(const_int 6) (const_int 14)
(const_int 7) (const_int 15)])))]
- "TARGET_ALTIVEC"
+ "TARGET_ALTIVEC && BYTES_BIG_ENDIAN"
+ "vmrglh %0,%1,%2"
+ [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vmrglh_direct_le"
+ [(set (match_operand:V8HI 0 "register_operand" "=v")
+ (vec_select:V8HI
+ (vec_concat:V16HI
+ (match_operand:V8HI 2 "register_operand" "v")
+ (match_operand:V8HI 1 "register_operand" "v"))
+ (parallel [(const_int 0) (const_int 8)
+ (const_int 1) (const_int 9)
+ (const_int 2) (const_int 10)
+ (const_int 3) (const_int 11)])))]
+ "TARGET_ALTIVEC && !BYTES_BIG_ENDIAN"
"vmrglh %0,%1,%2"
[(set_attr "type" "vecperm")])
@@ -3777,13 +3807,13 @@ (define_expand "vec_widen_umult_hi_v16qi"
{
emit_insn (gen_altivec_vmuleub (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmuloub (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghh_direct (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrghh (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmuloub (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmuleub (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghh_direct (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrglh (operands[0], ve, vo));
}
DONE;
})
@@ -3802,13 +3832,13 @@ (define_expand "vec_widen_umult_lo_v16qi"
{
emit_insn (gen_altivec_vmuleub (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmuloub (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglh_direct (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrglh (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmuloub (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmuleub (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglh_direct (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrghh (operands[0], ve, vo));
}
DONE;
})
@@ -3827,13 +3857,13 @@ (define_expand "vec_widen_smult_hi_v16qi"
{
emit_insn (gen_altivec_vmulesb (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulosb (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghh_direct (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrghh (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmulosb (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulesb (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrghh_direct (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrglh (operands[0], ve, vo));
}
DONE;
})
@@ -3852,13 +3882,13 @@ (define_expand "vec_widen_smult_lo_v16qi"
{
emit_insn (gen_altivec_vmulesb (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulosb (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglh_direct (operands[0], ve, vo));
+ emit_insn (gen_altivec_vmrglh (operands[0], ve, vo));
}
else
{
emit_insn (gen_altivec_vmulosb (ve, operands[1], operands[2]));
emit_insn (gen_altivec_vmulesb (vo, operands[1], operands[2]));
- emit_insn (gen_altivec_vmrglh_direct (operands[0], vo, ve));
+ emit_insn (gen_altivec_vmrghh (operands[0], ve, vo));
}
DONE;
})
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 10088033aa1..76eb89ad529 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -23170,8 +23170,8 @@ altivec_expand_vec_perm_const (rtx target, rtx op0, rtx op1,
: CODE_FOR_altivec_vmrglb_direct_le,
{0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23}},
{OPTION_MASK_ALTIVEC,
- BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghh_direct
- : CODE_FOR_altivec_vmrglh_direct,
+ BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghh_direct_be
+ : CODE_FOR_altivec_vmrglh_direct_le,
{0, 1, 16, 17, 2, 3, 18, 19, 4, 5, 20, 21, 6, 7, 22, 23}},
{OPTION_MASK_ALTIVEC,
BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrghw_direct_v4si_be
@@ -23182,8 +23182,8 @@ altivec_expand_vec_perm_const (rtx target, rtx op0, rtx op1,
: CODE_FOR_altivec_vmrghb_direct_le,
{8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31}},
{OPTION_MASK_ALTIVEC,
- BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglh_direct
- : CODE_FOR_altivec_vmrghh_direct,
+ BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglh_direct_be
+ : CODE_FOR_altivec_vmrghh_direct_le,
{8, 9, 24, 25, 10, 11, 26, 27, 12, 13, 28, 29, 14, 15, 30, 31}},
{OPTION_MASK_ALTIVEC,
BYTES_BIG_ENDIAN ? CODE_FOR_altivec_vmrglw_direct_v4si_be
diff --git a/gcc/testsuite/gcc.target/powerpc/pr106069-2.c b/gcc/testsuite/gcc.target/powerpc/pr106069-2.c
new file mode 100644
index 00000000000..283e3290fb3
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr106069-2.c
@@ -0,0 +1,37 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-require-effective-target vmx_hw } */
+
+/* Test vector merge for 16-bit element size,
+ it will abort if the RTL pattern isn't expected. */
+
+#include "altivec.h"
+
+__attribute__((noipa))
+signed short elem_2 (vector signed short a, vector signed short b)
+{
+ vector signed short c = vec_mergeh (a,b);
+ return vec_extract (c, 2);
+}
+
+__attribute__((noipa))
+unsigned short elem_7 (vector unsigned short a, vector unsigned short b)
+{
+ vector unsigned short c = vec_mergel (a,b);
+ return vec_extract (c, 7);
+}
+
+int
+main ()
+{
+ vector unsigned short v1 = {3, 22, 12, 34, 5, 25, 30, 11};
+ vector unsigned short v2 = {84, 168, 267, 966, 65, 399, 999, 99};
+ signed short x1 = elem_2 ((vector signed short) v1, (vector signed short) v2);
+ unsigned short x2 = elem_7 (v1, v2);
+
+ if (x1 != 22 || x2 != 99)
+ __builtin_abort ();
+
+ return 0;
+}
+