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loop-unroll.c (analyze_iv_to_split_insn): Handle iv_analyze_result returning false.

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* loop-unroll.c (analyze_iv_to_split_insn): Handle 
	iv_analyze_result returning false.

From-SVN: r112289
This commit is contained in:
Jeff Law 2006-03-22 11:00:50 -07:00 committed by Jeff Law
parent 906ac235a5
commit 4dc7782d15
2 changed files with 16 additions and 1 deletions

5
gcc/ChangeLog

@ -1,3 +1,8 @@
2006-03-22 Jeff Law <law@redhat.com>
* loop-unroll.c (analyze_iv_to_split_insn): Handle
iv_analyze_result returning false.
2006-03-22 Jie Zhang <jie.zhang@analog.com>
* config/bfin/bfin.h (ASM_FORMAT_PRIVATE_NAME): Remove.

12
gcc/loop-unroll.c

@ -1670,7 +1670,17 @@ analyze_iv_to_split_insn (rtx insn)
return NULL;
ok = iv_analyze_result (insn, dest, &iv);
gcc_assert (ok);
/* This used to be an assert under the assumption that if biv_p returns
true that iv_analyze_result must also return true. However, that
assumption is not strictly correct as evidenced by pr25569.
Returning NULL when iv_analyze_result returns false is safe and
avoids the problems in pr25569 until the iv_analyze_* routines
can be fixed, which is apparently hard and time consuming
according to their author. */
if (! ok)
return NULL;
if (iv.step == const0_rtx
|| iv.mode != iv.extend_mode)