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jump.c (can_reverse_comparison_p): Do not abort if the comparison insn for a conditional jump can not be found.

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        * jump.c (can_reverse_comparison_p): Do not abort if the comparison
        insn for a conditional jump can not be found.

From-SVN: r27043
This commit is contained in:
Jeff Law 1999-05-19 18:41:26 -06:00
parent b87bc8f3ad
commit f8d41a69ee
1 changed files with 10 additions and 1 deletions
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11
gcc/jump.c
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@ -3151,8 +3151,17 @@ can_reverse_comparison_p (comparison, insn)
) )
{ {
rtx prev = prev_nonnote_insn (insn); rtx prev = prev_nonnote_insn (insn);
rtx set = single_set (prev); rtx set;
/* If the comparison itself was a loop invariant, it could have been
hoisted out of the loop. If we proceed to unroll such a loop, then
we may not be able to find the comparison when copying the loop.
Returning zero in that case is the safe thing to do. */
if (prev == 0)
return 0;
set = single_set (prev);
if (set == 0 || SET_DEST (set) != arg0) if (set == 0 || SET_DEST (set) != arg0)
return 0; return 0;