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(reg_set_last): Allow old value to be a SUBREG.

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From-SVN: r2170
This commit is contained in:
Richard Kenner 1992-09-19 15:42:53 -04:00
parent 95ac8e67bc
commit 4d9d7d9d35
1 changed files with 4 additions and 3 deletions
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7
gcc/rtlanal.c
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@ -779,8 +779,8 @@ reg_set_last_1 (x, pat)
/* Return the last value to which REG was set prior to INSN. If we can't
find it easily, return 0.
We only return a REG or constant because it is too hard to check if a
MEM remains unchanged. */
We only return a REG, SUBREG, or constant because it is too hard to
check if a MEM remains unchanged. */
rtx
reg_set_last (x, insn)
@ -818,7 +818,8 @@ reg_set_last (x, insn)
else if (reg_set_last_value)
{
if (CONSTANT_P (reg_set_last_value)
|| (GET_CODE (reg_set_last_value) == REG
|| ((GET_CODE (reg_set_last_value) == REG
|| GET_CODE (reg_set_last_value) == SUBREG)
&& ! reg_set_between_p (reg_set_last_value,
NEXT_INSN (insn), orig_insn)))
return reg_set_last_value;