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cse.c (fold_rtx): Avoid building of (CONST (MINUS (CONST_INT) (SYMBOL_REF)))

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* cse.c (fold_rtx):  Avoid building of
	(CONST (MINUS (CONST_INT) (SYMBOL_REF)))

From-SVN: r87156
This commit is contained in:
Jan Hubicka 2004-09-07 22:59:18 +02:00 • committed by Jan Hubicka
parent c4817ba67e
commit ec666d23ca
2 changed files with 13 additions and 1 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
2004-09-07 Jan Hubicka <jh@suse.cz>
* cse.c (fold_rtx): Avoid building of
(CONST (MINUS (CONST_INT) (SYMBOL_REF)))
* tree-ssa-pre.c (grand_bitmap_obstack): New.
(value_insert_into_set_bitmap, bitmap_set_new): Use the obstack.
(init_pre): Initialize obstack.

11
gcc/cse.c
View file

@ -3787,7 +3787,16 @@ fold_rtx (rtx x, rtx insn)
new = simplify_unary_operation (code, mode,
const_arg0 ? const_arg0 : folded_arg0,
mode_arg0);
if (new != 0 && is_const)
/* NEG of PLUS could be converted into MINUS, but that causes
expressions of the form
(CONST (MINUS (CONST_INT) (SYMBOL_REF)))
which many ports mistakenly treat as LEGITIMATE_CONSTANT_P.
FIXME: those ports should be fixed. */
if (new != 0 && is_const
&& GET_CODE (new) == PLUS
&& (GET_CODE (XEXP (new, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (new, 0)) == LABEL_REF)
&& GET_CODE (XEXP (new, 1)) == CONST_INT)
new = gen_rtx_CONST (mode, new);
}
break;