http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54989
bin.cheng <amker.cheng at gmail dot com> changed:
What |Removed |Added
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CC| |amker.cheng at gmail dot
| |com
--- Comment #1 from bin.cheng <amker.cheng at gmail dot com> 2012-10-20
05:40:08 UTC ---
The failure is caused by higher register pressure in the THEN branch of the
case, though I am not sure why the register pressure is higher than x86-linux.
This can be fixed by simplifying test case as below:
/* { dg-options "-Os -fdump-rtl-hoist" } */
/* { dg-final { scan-rtl-dump "PRE/HOIST: end of bb .* copying expression"
"hoist" } } */
#define BUF 100
int a[BUF];
void com (int);
void bar (int);
int foo (int x, int y, int z)
{
/* "x+y" won't be hoisted if "-fira-hoist-pressure" is disabled,
because its rtx_cost is too small. */
if (z)
{
a[1] = a[0];
a[2] = a[1];
a[3] = a[2];
a[4] = a[3];
a[5] = a[4];
a[6] = a[5];
a[7] = a[6];
com (x+y);
}
else
{
bar (x+y);
}
return 0;
}
I will send a patch fixing this.
