OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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
This commit is contained in:
Alan Modra 2004-05-27 07:41:50 +00:00 committed by Alan Modra
parent c5d2de6b4c
commit 42f806e5a0
2 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -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

7
gcc/config/rs6000/rs6000.c
View File

@ -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);
}