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| author | Alan Modra <amodra@bigpond.net.au> | 2004-05-27 07:41:50 +0000 |
|---|---|---|
| committer | Alan Modra <amodra@gcc.gnu.org> | 2004-05-27 17:11:50 +0930 |
| commit | 42f806e5a0bbc3f5a02394893343e7e6ce1e94f2 (patch) | |
| tree | dab3ea8a505686bcd5d39b18a2d6c0ead1478474 /gcc | |
| parent | c5d2de6b4c976dc152c8618ab3e8e1319018dc30 (diff) | |
| download | gcc-42f806e5a0bbc3f5a02394893343e7e6ce1e94f2.zip gcc-42f806e5a0bbc3f5a02394893343e7e6ce1e94f2.tar.gz gcc-42f806e5a0bbc3f5a02394893343e7e6ce1e94f2.tar.bz2 | |
re PR target/14478 ([3.3 only] rs6000 geu/ltu patterns generate incorrect code)
PR target/14478
* config/rs6000/rs6000.c (reg_or_neg_short_operand): Don't allow zero.
From-SVN: r82315
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/rs6000/rs6000.c | 7 |
2 files changed, 10 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a13cbdd..353c25c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2004-05-27 Alan Modra <amodra@bigpond.net.au> + + PR target/14478 + * config/rs6000/rs6000.c (reg_or_neg_short_operand): Don't allow zero. + 2004-05-27 Josef Zlomek <zlomekj@suse.cz> PR middle-end/14084 diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index e6ce004..4b23dcc 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -1407,13 +1407,16 @@ reg_or_short_operand (rtx op, enum machine_mode mode) } /* Similar, except check if the negation of the constant would be - valid for a D-field. */ + valid for a D-field. Don't allow a constant zero, since all the + patterns that call this predicate use "addic r1,r2,-constant" on + a constant value to set a carry when r2 is greater or equal to + "constant". That doesn't work for zero. */ int reg_or_neg_short_operand (rtx op, enum machine_mode mode) { if (GET_CODE (op) == CONST_INT) - return CONST_OK_FOR_LETTER_P (INTVAL (op), 'P'); + return CONST_OK_FOR_LETTER_P (INTVAL (op), 'P') && INTVAL (op) != 0; return gpc_reg_operand (op, mode); } |