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local-alloc.c (update_equiv_regs): Ignore insns that read or write registers that are likely to be spilled.

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* local-alloc.c (update_equiv_regs): Ignore insns that read or
        write registers that are likely to be spilled.

From-SVN: r12272
This commit is contained in:
Jeff Law 1996-06-10 14:41:40 -06:00
parent d7ff155ff0
commit 49ddab1699
1 changed files with 9 additions and 3 deletions
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12
gcc/local-alloc.c
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@ -973,7 +973,7 @@ update_equiv_regs ()
{
rtx note;
rtx set = single_set (insn);
rtx dest;
rtx dest, src;
int regno;
if (GET_CODE (insn) == NOTE)
@ -989,6 +989,7 @@ update_equiv_regs ()
continue;
dest = SET_DEST (set);
src = SET_SRC (set);
/* If this sets a MEM to the contents of a REG that is only used
in a single basic block, see if the register is always equivalent
@ -1024,10 +1025,15 @@ update_equiv_regs ()
optimize_reg_copy_2 (insn, dest, SET_SRC (set));
/* Otherwise, we only handle the case of a pseudo register being set
once. */
once and only if neither the source nor the destination are
in a register class that's likely to be spilled. */
if (GET_CODE (dest) != REG
|| (regno = REGNO (dest)) < FIRST_PSEUDO_REGISTER
|| reg_n_sets[regno] != 1)
|| reg_n_sets[regno] != 1
|| CLASS_LIKELY_SPILLED_P (reg_preferred_class (REGNO (dest)))
|| (GET_CODE (src) == REG
&& REGNO (src) >= FIRST_PSEUDO_REGISTER
&& CLASS_LIKELY_SPILLED_P (reg_preferred_class (REGNO (src)))))
continue;
note = find_reg_note (insn, REG_EQUAL, NULL_RTX);