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* [gcc r13-3368] Canonicalize vec_perm index to make the first index come from the first vector.
@ 2022-10-19 6:13 hongtao Liu
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From: hongtao Liu @ 2022-10-19 6:13 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1442e2031e0bc2d0a5bf88ef3c92c5410e044bab
commit r13-3368-g1442e2031e0bc2d0a5bf88ef3c92c5410e044bab
Author: liuhongt <hongtao.liu@intel.com>
Date: Tue Oct 18 16:58:52 2022 +0800
Canonicalize vec_perm index to make the first index come from the first vector.
Fix unexpected non-canon form from gimple vector selector.
gcc/ChangeLog:
PR target/107271
* config/i386/i386-expand.cc (ix86_vec_perm_index_canon): New.
(expand_vec_perm_shufps_shufps): Call
ix86_vec_perm_index_canon
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr107271.c: New test.
Diff:
---
gcc/config/i386/i386-expand.cc | 17 +++++++++++++++++
gcc/testsuite/gcc.target/i386/pr107271.c | 16 ++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc
index a0f8a98986e..70fd82b27d4 100644
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -19604,6 +19604,22 @@ expand_vec_perm_1 (struct expand_vec_perm_d *d)
return false;
}
+/* Canonicalize vec_perm index to make the first index
+ always comes from the first vector. */
+static void
+ix86_vec_perm_index_canon (struct expand_vec_perm_d *d)
+{
+ unsigned nelt = d->nelt;
+ if (d->perm[0] < nelt)
+ return;
+
+ for (unsigned i = 0; i != nelt; i++)
+ d->perm[i] = (d->perm[i] + nelt) % (2 * nelt);
+
+ std::swap (d->op0, d->op1);
+ return;
+}
+
/* A subroutine of ix86_expand_vec_perm_const_1. Try to implement D
in terms of a pair of shufps+ shufps/pshufd instructions. */
static bool
@@ -19621,6 +19637,7 @@ expand_vec_perm_shufps_shufps (struct expand_vec_perm_d *d)
if (d->testing_p)
return true;
+ ix86_vec_perm_index_canon (d);
for (i = 0; i < 4; ++i)
count += d->perm[i] > 3 ? 1 : 0;
diff --git a/gcc/testsuite/gcc.target/i386/pr107271.c b/gcc/testsuite/gcc.target/i386/pr107271.c
new file mode 100644
index 00000000000..fe89c9a5bef
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr107271.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O0" } */
+
+typedef int __attribute__((__vector_size__ (16))) V;
+
+static inline __attribute__((__always_inline__)) V
+bar (V v128u32_0)
+{
+ return __builtin_shuffle ((V){}, v128u32_0, v128u32_0);
+}
+
+V
+foo (void)
+{
+ return bar ((V){7, 4, 4});
+}
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2022-10-19 6:13 [gcc r13-3368] Canonicalize vec_perm index to make the first index come from the first vector hongtao Liu
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