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* cse.c (fold_rtx) <PC>: Don't optimize. 

From-SVN: r94378
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Kazu Hirata 2005-01-28 17:12:08 +00:00 committed by Kazu Hirata
parent bd16270bd8
commit 01aa1d43e4
2 changed files with 5 additions and 11 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2005-01-28 Kazu Hirata <kazu@cs.umass.edu>
* cse.c (fold_rtx) <PC>: Don't optimize.
2005-01-28 Jeff Law <law@redhat.com>
* fold-const.c (fold, case CEIL_MOD_EXPR): Optimize 0 % X.

12
gcc/cse.c
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@ -3265,6 +3265,7 @@ fold_rtx (rtx x, rtx insn)
case SYMBOL_REF:
case LABEL_REF:
case REG:
case PC:
/* No use simplifying an EXPR_LIST
since they are used only for lists of args
in a function call's REG_EQUAL note. */
@ -3276,17 +3277,6 @@ fold_rtx (rtx x, rtx insn)
return prev_insn_cc0;
#endif
case PC:
/* If the next insn is a CODE_LABEL followed by a jump table,
PC's value is a LABEL_REF pointing to that label. That
lets us fold switch statements on the VAX. */
{
rtx next;
if (insn && tablejump_p (insn, &next, NULL))
return gen_rtx_LABEL_REF (Pmode, next);
}
break;
case SUBREG:
/* See if we previously assigned a constant value to this SUBREG. */
if ((new = lookup_as_function (x, CONST_INT)) != 0