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optimization/6790: conditional expression as assignment lhs evaluated incorrectly
- From: horsh at mail dot ru
- To: gcc-gnats at gcc dot gnu dot org
- Date: 24 May 2002 00:21:41 -0000
- Subject: optimization/6790: conditional expression as assignment lhs evaluated incorrectly
- Reply-to: horsh at mail dot ru
>Number: 6790
>Category: optimization
>Synopsis: conditional expression as assignment lhs evaluated incorrectly
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Thu May 23 17:26:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: papahorsh
>Release: 2.95.3 20010315 (SuSE), 3.1
>Organization:
>Environment:
Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.3/specs
gcc version 2.95.3 20010315 (SuSE)
or
Reading specs from /pkg/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.1/specs
Configured with: ../configure --prefix=/pkg/gnu --enable-languages=c++,f77
Thread model: posix
gcc version 3.1
>Description:
The following four little pieces should give identical
results:
$gcc test.c; ./a.out
-2, -2, -2 , -2, 0, -2
-2, -2, -2 , -2, 0, -2
-2, -2, -2 , -2, 0, -2
-2, -2, -2 , -2, 0, -2
but they dont:
gcc test.c; ./a.out
-2, -2, -2 , -2, 0, -2
-4, -2, -2 , -2, 0, -2
-2, -2, -2 , -2, 0, -2
-2, -2, -2 , -2, 0, -2
$cat test.c
void
main(void) {
int a, b, c, x, y, z, A, B, C, X, Y, Z;
a=-2; b=-2; c=-2; x=-2; y=-2; z=-2;
(y -= b);
(c ? a : b) += (x ? y : z);
printf("%d, %d, %d , %d, %d, %d\n", a, b, c, x, y, z);
/*------------------------------------------------------------------*/
a=-2; b=-2; c=-2; x=-2; y=-2; z=-2;
(
(y -= b) ?
(c ? a : b) :
(c ? a : b) ) += (x ? y : z);
printf("%d, %d, %d , %d, %d, %d\n", a, b, c, x, y, z);
/*------------------------------------------------------------------*/
a=-2; b=-2; c=-2; x=-2; y=-2; z=-2;
(
(y -= b) ?
((c ? a : b) += (x ? y : z)) :
((c ? a : b) += (x ? y : z)) );
printf("%d, %d, %d , %d, %d, %d\n", a, b, c, x, y, z);
/*------------------------------------------------------------------*/
a=-2; b=-2; c=-2; x=-2; y=-2; z=-2;
(
(y -= b) ?
((c ? (a += (x ? y : z)) : (b += (x ? y : z)))) :
((c ? (a += (x ? y : z)) : (b += (x ? y : z)))) );
printf("%d, %d, %d , %d, %d, %d\n", a, b, c, x, y, z);
}
>How-To-Repeat:
just compile and run:
$gcc test.c; ./a.out
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: