From 2eaebcf3df4dba0bfa379b7adde455710e9b3e41 Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Mon, 21 Aug 2023 14:09:48 +0200
Subject: [PATCH] Fix FAIL: gcc.target/i386/pr87007-5.c
The following fixes the gcc.target/i386/pr87007-5.c testcase which
changed code generation again after the recent sinking improvements.
We now have
vxorps %xmm0, %xmm0, %xmm0
vsqrtsd d2(%rip), %xmm0, %xmm0
and a necessary xor again in one case, the other vsqrtsd has
a register source and a properly zeroing load:
vmovsd d3(%rip), %xmm0
testl %esi, %esi
jg .L11
.L3:
vsqrtsd %xmm0, %xmm0, %xmm0
the following patch adjusts the scan.
* gcc.target/i386/pr87007-5.c: Update comment, adjust subtest.
---
gcc/testsuite/gcc.target/i386/pr87007-5.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/gcc/testsuite/gcc.target/i386/pr87007-5.c b/gcc/testsuite/gcc.target/i386/pr87007-5.c
index a6cdf11522e5..8f2dc947f6c4 100644
--- a/gcc/testsuite/gcc.target/i386/pr87007-5.c
+++ b/gcc/testsuite/gcc.target/i386/pr87007-5.c
@@ -1,6 +1,8 @@
/* { dg-do compile } */
/* { dg-options "-Ofast -march=skylake-avx512 -mfpmath=sse -fno-tree-vectorize -fdump-tree-cddce3-details -fdump-tree-lsplit-optimized" } */
-/* Load of d2/d3 is hoisted out, vrndscalesd will reuse loades register to avoid partial dependence. */
+/* Load of d2/d3 is hoisted out, the loop is split, store of d1 and sqrt
+ are sunk out of the loop and the loop is elided. One vsqrtsd with
+ memory operand needs a xor to avoid partial dependence. */
#include<math.h>
@@ -17,4 +19,4 @@ foo (int n, int k)
/* { dg-final { scan-tree-dump "optimized: loop split" "lsplit" } } */
/* { dg-final { scan-tree-dump-times "removing loop" 2 "cddce3" } } */
-/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 0 } } */
+/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 1 } } */
--
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