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(eliminate_regs_in_insn): Make another copy of all the RTL if we 

changed something and we aren't permanently replacing.

From-SVN: r2845
This commit is contained in:
Richard Kenner 1992-12-07 21:43:55 -05:00
parent df6c0bdc91
commit 7c791b139c
1 changed files with 8 additions and 0 deletions
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8
gcc/reload1.c
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@ -2996,6 +2996,14 @@ eliminate_regs_in_insn (insn, replace)
new_body = eliminate_regs (old_body, 0, replace ? insn : NULL_RTX);
if (new_body != old_body)
{
/* If we aren't replacing things permanently and we changed something,
make another copy to ensure that all the RTL is new. Otherwise
things can go wrong if find_reload swaps commutative operands
and one is inside RTL that has been copied while the other is not. */
if (! replace)
new_body = copy_rtx (new_body);
/* If we had a move insn but now we don't, rerecognize it. */
if ((GET_CODE (old_body) == SET && GET_CODE (SET_SRC (old_body)) == REG
&& (GET_CODE (new_body) != SET