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* loop.c (loop_regs_scan): Don't invalidate PIC register. 

From-SVN: r46817
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Steve Christiansen 2001-11-07 06:24:46 +00:00 committed by Richard Henderson
parent 2a2be25e12
commit bc532bf72b
2 changed files with 16 additions and 5 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2001-11-06 Steve Christiansen <smc@us.ibm.com>
* loop.c (loop_regs_scan): Don't invalidate PIC register.
2001-11-06 Eric Christopher <echristo@redhat.com>
* config/mips/mips.md(movdf_internal2): Add constraints for float

17
gcc/loop.c
View File

@ -8819,11 +8819,18 @@ loop_regs_scan (loop, extra_size)
memset (last_set, 0, regs->num * sizeof (rtx));
}
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
regs->array[i].may_not_optimize = 1;
regs->array[i].set_in_loop = 1;
}
/* Invalidate all hard registers clobbered by calls. With one exception:
a call-clobbered PIC register is still function-invariant for our
purposes, since we can hoist any PIC calculations out of the loop.
Thus the call to rtx_varies_p. */
if (LOOP_INFO (loop)->has_call)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i)
&& rtx_varies_p (gen_rtx_REG (Pmode, i), /*for_alias=*/1))
{
regs->array[i].may_not_optimize = 1;
regs->array[i].set_in_loop = 1;
}
#ifdef AVOID_CCMODE_COPIES
/* Don't try to move insns which set CC registers if we should not