http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58493
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mikpe at it dot uu.se
--- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> ---
The C test case started working for 4.9 with Richard's "Vectorizer TLC:
re-organize data dependence checking" patch in r196872. The original patch
description <http://gcc.gnu.org/ml/gcc-patches/2013-02/msg01238.html> doesn't
mention any wrong-code fixes in that patch.
The code generation difference on the test case at r196872 is:
--- pr54893.s-r196871 2013-09-23 14:51:29.441292880 +0200
+++ pr54893.s-r196872 2013-09-23 14:54:55.000501714 +0200
@@ -12,8 +12,6 @@
sarl %edi
testl %edi, %edi
jle .L25
- cmpl $8, %edi
- jbe .L3
leaq 64(%rsi), %rax
cmpq %rax, %rdx
leaq 64(%rdx), %rax
@@ -22,6 +20,8 @@
setae %al
orb %al, %cl
je .L3
+ cmpl $9, %edi
+ jbe .L3
leal -1(%rdi), %r9d
vmovapd .LC0(%rip), %ymm1
movq %rdx, %rax
