http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47525
Summary: DCE fails to eliminate a dead call to a pure function
when compiled with -maltivec
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: berg...@gcc.gnu.org
The dead code eliminator is failing to eliminate a call to a dead pure function
when compiled with -maltivec. The test case looks like (it's a slightly
modified pr42461.c, so that older compilers that don't support
__builtin_unreachable() can compile it):
bergner@igoo:~/> cat pr42461-2.c
extern int link_failure (int) __attribute__ ((pure));
extern void no_return (void) __attribute__ ((noreturn,pure));
int
main (void)
{
if (link_failure (0) < 1)
no_return ();
return 0;
}
This compiles fine with GCC 4.3, but fails with GCC 4.4, 4.5 and trunk with the
following error message:
bergner@igoo:~/> gcc -O2 -maltivec pr42461-2.c
/tmp/ccUy2BCz.o:(.text+0x10): undefined reference to `link_failure'
collect2: ld returned 1 exit status
