/*
% gcc -v
Using built-in specs.
Target: i386-pc-solaris2.9
Configured with: /usr/local/gcc-4.0.2/src/gcc-4.0.2/configure
--enable-languages=c --with-gnu-as
--with-as=/usr/local/binutils-2.16.1/x86-SunOS-gcc-4.0.1/bin/as
--with-gnu-ld
--with-ld=/usr/local/binutils-2.16.1/x86-SunOS-gcc-4.0.1/bin/ld
--prefix=/usr/local/gcc-4.0.2/x86-SunOS-gnu-as-ld
Thread model: posix
gcc version 4.0.2
%
% gcc -O0 -o foo foo.c
% foo
z= 1
%
% gcc -O2 -o foo foo.c
% foo
z= 1
%
%
% gcc-4.1 -v
Using built-in specs.
Target: i386-pc-solaris2.9
Configured with: /home/kate/gcc-4.1-20060203/src/gcc-4.1-20060203/configure
--enable-languages=c --with-gnu-as
--with-as=/usr/local/binutils-2.16.1/x86-SunOS-gcc-4.0.1/bin/as
--with-gnu-ld
--with-ld=/usr/local/binutils-2.16.1/x86-SunOS-gcc-4.0.1/bin/ld
--prefix=/home/kate/gcc-4.1-20060203/x86-SunOS-gnu-as-ld
Thread model: posix
gcc version 4.1.0 20060203 (prerelease)
%
%
% gcc-4.1 -O0 -o foo foo.c
z = 1
%
% gcc-4.1 -O2 -o foo foo.c
z = -1
%
*/
#include <stdio.h>
int bar(x, y)
int x, y;
{
int x1, y1;
int x2, y2;
unsigned int x3, y3, w;
int z;
x1 = (x < (1 << 30));
y1 = (y < (1 << 30));
if (x1 && y1) {
x2 = ((x > 0)? (x): -(x));
y2 = ((y > 0)? (y): -(y));
x3 = x2;
y3 = y2;
w = x3 * y3;
if (w >= (1 << 30)) {
z = 1;
} else {
z = -1;
}
}
return z;
}
int main()
{
int x, y, z;
x = 536870912; /* 2^29 */
y = 2;
z = bar(x, y);
printf("z= %d\n", z);
}
--
Summary: optimization regression on x86-SunOS
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: regression
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kminola at eng dot umd dot edu
GCC build triplet: i386-pc-solaris2.9
GCC host triplet: i386-pc-solaris2.9
GCC target triplet: i386-pc-solaris2.9
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26180
