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| author | Jan Hubicka <jh@suse.cz> | 2004-09-07 22:59:18 +0200 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2004-09-07 20:59:18 +0000 |
| commit | ec666d23ca0f507e0940bcdf0b65848bceb1af30 (patch) | |
| tree | 4e9fa96fc33091fc673b10b40663ad44ba84f3aa /gcc | |
| parent | c4817ba67ecd0e9c9ec8bb2771be05551f9ce195 (diff) | |
| download | gcc-ec666d23ca0f507e0940bcdf0b65848bceb1af30.zip gcc-ec666d23ca0f507e0940bcdf0b65848bceb1af30.tar.gz gcc-ec666d23ca0f507e0940bcdf0b65848bceb1af30.tar.bz2 | |
cse.c (fold_rtx): Avoid building of (CONST (MINUS (CONST_INT) (SYMBOL_REF)))
* cse.c (fold_rtx): Avoid building of
(CONST (MINUS (CONST_INT) (SYMBOL_REF)))
From-SVN: r87156
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/cse.c | 11 |
2 files changed, 13 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d00cc21..3938e7a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. @@ -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; |