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* optimization/9735: IA-64 doesn't honor trapping math when doing final schedule
@ 2003-02-17 22:46 jakub
0 siblings, 0 replies; only message in thread
From: jakub @ 2003-02-17 22:46 UTC (permalink / raw)
To: gcc-gnats; +Cc: wilson, vmakarov
>Number: 9735
>Category: optimization
>Synopsis: IA-64 doesn't honor trapping math when doing final schedule
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon Feb 17 22:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: jakub@redhat.com
>Release: 3.0 ... 3.4 20031117
>Organization:
>Environment:
ia64-*-linux*
>Description:
sched-ebb.c doesn't honor may_trap_p when scheduling
during ia64_machine_reorg, so a possibly trapping insn (in
the testcase below fcmp.lt) can be scheduled before a branch
in the same extended basic block which should protect it.
I've tried to add haifa_classify_insn (insn) == TRAP_RISKY
checks into sched-ebb.c's new_ready and init_ready_list,
but probably more changes are needed to get it working.
>How-To-Repeat:
/* { dg-do run { target ia64-*-linux* } } */
/* { dg-options "-O3" } } */
int __attribute__((noinline, const))
ret4 (float value)
{
return 4;
}
int __attribute__((noinline, const))
ret0 (float value)
{
return 0;
}
float __attribute__((noinline))
test (float x, float y)
{
int clsx = ret4 (x);
int clsy = ret0 (y);
if (clsx == 0 || clsy == 0
|| (y < 0 && clsx == 1 && clsy == 1))
return x - y;
return x < y ? 0 : x - y;
}
float a = 0.0, b;
int main (void)
{
unsigned long e;
b = a / a;
__asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (e));
e &= ~0x7e000UL;
__asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (e) : "memory");
a = test (0, b);
__asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (e));
if (e & 0x2000)
abort ();
exit (0);
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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