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[Bug rtl-optimization/55845] 454.calculix miscompares with -march=btver2 -O3 -ffastmath -fschedule-insns -mvzeroupper for test data run
- From: "vbyakovl23 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 04 Jan 2013 06:40:44 +0000
- Subject: [Bug rtl-optimization/55845] 454.calculix miscompares with -march=btver2 -O3 -ffastmath -fschedule-insns -mvzeroupper for test data run
- Auto-submitted: auto-generated
- References: <bug-55845-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55845
--- Comment #3 from Vladimir Yakovlev <vbyakovl23 at gmail dot com> 2013-01-04 06:40:44 UTC ---
The test fails corei7-avx also. I build a simple reproducer.
-------------------------------------------------------------
#include <stdio.h>
#define N 100
double
foo (
int size,
double y[],
double x[]
)
{
double sum = 0.0 ;
int i ;
for (i = 0, sum = 0. ; i < size ; i++)
sum += y[i] * x[i] ;
return(sum);
}
int main ()
{
double x[N];
double y[N];
double s;
int i;
for (i = 0; i < N; i++)
{
x[i] = i;
y[i] = i;
}
s = foo (N, y, x);
printf("%s\n", s == 328350 ? "pass" : "fail");
}
------------------------------------------------------
$ gcc -mavx -g -static -o t -O3 -ffast-math -march=corei7 t.c -fno-inline &&
./t
pass
$ gcc -fschedule-insns -mavx -g -static -o t -O3 -ffast-math -march=corei7
t.c -fno-inline && ./t
fail
Responsible phase is jump2. To switch off the phase I did changes
diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c
index 5d142e9..be04c5d 100644
--- a/gcc/cfgcleanup.c
+++ b/gcc/cfgcleanup.c
@@ -3070,6 +3070,7 @@ struct rtl_opt_pass pass_jump =
static unsigned int
execute_jump2 (void)
{
+ if (!getenv("NOJMP2"))
cleanup_cfg (flag_crossjumping ? CLEANUP_CROSSJUMP : 0);
return 0;
}
env NOJMP2=1 gcc -fschedule-insns -mavx -g -static -o t -O3 -ffast-math
-march=corei7 t.c -fno-inline && ./t
pass
I used compiler
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure CFLAGS='-O0 -g3' CXXFLAGS='-O0 -g3'
--prefix=/gnumnt/msticlxl16_users/vbyakovl/workspaces/gcc/install
--enable-clocale=gnu --disable-bootstrap --with-system-zlib --enable-shared
--with-demangler-in-ld --with-fpmath=sse --with-arch=corei7-avx
--with-cpu=corei7-avx --enable-languages=c,c++,fortran,java,lto,objc
--no-create --no-recursion