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* [gcc r13-4123] middle-end: ensure that VEC_PERM operands get lowered to the same SSA_NAME. [PR107717]
@ 2022-11-17 8:22 Tamar Christina
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From: Tamar Christina @ 2022-11-17 8:22 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:cbe313060cdcf1d857d42a9e16a1a03e5ff89fff
commit r13-4123-gcbe313060cdcf1d857d42a9e16a1a03e5ff89fff
Author: Tamar Christina <tamar.christina@arm.com>
Date: Thu Nov 17 08:20:59 2022 +0000
middle-end: ensure that VEC_PERM operands get lowered to the same SSA_NAME. [PR107717]
At the moment when the VEC_PERMs generated by this match.pd rule is generated
it creates two different SSA_NAMEs for the folded operand. Because of this it
the permute switches from a single operand permute to a two operand permute and
the target may no longer support a permute for this.
This fixes it by ensuring we generate the same SSA_NAME for both operands.
gcc/ChangeLog:
PR tree-optimization/107717
* match.pd: Ensure same SSA_NAME.
gcc/testsuite/ChangeLog:
PR tree-optimization/107717
* gcc.target/aarch64/sve2/pr107717.c: New test.
Diff:
---
gcc/match.pd | 4 ++--
gcc/testsuite/gcc.target/aarch64/sve2/pr107717.c | 8 ++++++++
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/gcc/match.pd b/gcc/match.pd
index fe1178cf0d5..5aba1653b80 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -8262,7 +8262,7 @@ and,
(simplify
(op (vec_perm @0 @0 @2) (vec_perm @1 @1 @2))
(if (VECTOR_INTEGER_TYPE_P (type))
- (vec_perm (op @0 @1) (op @0 @1) @2))))
+ (vec_perm (op@3 @0 @1) @3 @2))))
/* Similar for float arithmetic when permutation constant covers
all vector elements. */
@@ -8301,4 +8301,4 @@ and,
}
}
(if (full_perm_p)
- (vec_perm (op @0 @1) (op @0 @1) @2))))))
+ (vec_perm (op@3 @0 @1) @3 @2))))))
diff --git a/gcc/testsuite/gcc.target/aarch64/sve2/pr107717.c b/gcc/testsuite/gcc.target/aarch64/sve2/pr107717.c
new file mode 100644
index 00000000000..09dc9afa61f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve2/pr107717.c
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3 -march=armv8-a+sve2" } */
+
+void foo(int n, char *restrict out, char *restrict in) {
+ for (int i=n; i-->0; ) {
+ out[i] += in[i];
+ }
+}
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