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* [gcc r13-4423] rs6000: Generates permute index directly for little endian targets (PR100866)
@ 2022-12-01 2:07 HaoChen Gui
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From: HaoChen Gui @ 2022-12-01 2:07 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:9d68cba5eb20442f8075b8f92d1b20a00022852f
commit r13-4423-g9d68cba5eb20442f8075b8f92d1b20a00022852f
Author: Haochen Gui <guihaoc@gcc.gnu.org>
Date: Wed Nov 30 15:05:59 2022 +0800
rs6000: Generates permute index directly for little endian targets (PR100866)
2022-10-11 Haochen Gui <guihaoc@linux.ibm.com>
gcc/
PR target/100866
* config/rs6000/rs6000-call.cc (swap_endian_selector_for_mode):
Generate permute index directly for little endian targets.
* config/rs6000/vsx.md (revb_<mode>): Call vprem directly with
corresponding permute indexes.
gcc/testsuite/
PR target/100866
* gcc.target/powerpc/pr100866-1.c: New.
Diff:
---
gcc/config/rs6000/rs6000-call.cc | 8 +++++++-
gcc/config/rs6000/vsx.md | 4 ++--
gcc/testsuite/gcc.target/powerpc/pr100866-1.c | 11 +++++++++++
3 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/gcc/config/rs6000/rs6000-call.cc b/gcc/config/rs6000/rs6000-call.cc
index 6da4de67137..c2a4e4f4e27 100644
--- a/gcc/config/rs6000/rs6000-call.cc
+++ b/gcc/config/rs6000/rs6000-call.cc
@@ -2802,6 +2802,8 @@ rs6000_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
return build_va_arg_indirect_ref (addr);
}
+/* The selector (perm) is expected to be used with vperm direct as the
+ function generates reversed perm for little endian with this patch. */
rtx
swap_endian_selector_for_mode (machine_mode mode)
{
@@ -2834,7 +2836,11 @@ swap_endian_selector_for_mode (machine_mode mode)
}
for (i = 0; i < 16; ++i)
- perm[i] = GEN_INT (swaparray[i]);
+ if (BYTES_BIG_ENDIAN)
+ perm[i] = GEN_INT (swaparray[i]);
+ else
+ /* Generates the reversed perm for little endian. */
+ perm[i] = GEN_INT (~swaparray[i] & 0x0000001f);
return force_reg (V16QImode, gen_rtx_CONST_VECTOR (V16QImode,
gen_rtvec_v (16, perm)));
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index fb5cf04147e..992fbc983be 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -6099,8 +6099,8 @@
to the endian mode in use, i.e. in LE mode, put elements
in BE order. */
rtx sel = swap_endian_selector_for_mode (<MODE>mode);
- emit_insn (gen_altivec_vperm_<mode> (operands[0], operands[1],
- operands[1], sel));
+ emit_insn (gen_altivec_vperm_<mode>_direct (operands[0], operands[1],
+ operands[1], sel));
}
}
diff --git a/gcc/testsuite/gcc.target/powerpc/pr100866-1.c b/gcc/testsuite/gcc.target/powerpc/pr100866-1.c
new file mode 100644
index 00000000000..63872f21bf8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr100866-1.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target powerpc_p8vector_ok } */
+/* { dg-options "-O2 -mdejagnu-cpu=power8" } */
+/* { dg-final { scan-assembler-not {\mxxlnor\M} } } */
+
+#include <altivec.h>
+
+vector unsigned int revb (vector unsigned int a)
+{
+ return vec_revb(a);
+}
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