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Fix for 'Deadly optimization bug' (see egcs mailing list archive)

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From-SVN: r28928
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Bernd Schmidt 1999-08-27 09:39:14 +00:00 committed by Bernd Schmidt
parent 7cfc8a7830
commit 6c1b3bf290
2 changed files with 10 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Fri Aug 27 10:33:35 1999 Bernd Schmidt <bernds@cygnus.co.uk>
* combine.c (get_last_value): Don't look for earlier sets if the last
known set is somewhere in between the insns being combined.
Fri Aug 27 10:03:12 BST 1999 Nathan Sidwell <nathan@acm.org>
* configure.in: Don't use shell ! to negate exit codes

5
gcc/combine.c
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@ -10832,6 +10832,11 @@ get_last_value (x)
{
rtx insn, set;
/* We can't do anything if the value is set in between the insns we are
processing. */
if (INSN_CUID (reg_last_set[regno]) <= INSN_CUID (subst_insn))
return 0;
/* We can not do anything useful in this case, because there is
an instruction which is not on the insn chain. */
if (subst_prev_insn)