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

combine.c (simplify_comparison): Reduce (OP (MINUS A B) 0) to (OP A B). 

* combine.c (simplify_comparison): Reduce (OP (MINUS A B) 0)
        to (OP A B).

From-SVN: r30970
This commit is contained in:
Richard Henderson 1999-12-16 01:42:57 -08:00 committed by Jeff Law
parent 41adf8980c
commit 0bd4b46174
2 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
Thu Dec 16 02:41:26 1999 Richard Henderson (rth@cygnus.com)
* combine.c (simplify_comparison): Reduce (OP (MINUS A B) 0)
to (OP A B).
Thu Dec 16 02:26:11 1999 Jeffrey A Law (law@cygnus.com)
* h8300.md (HImode preinc peephole): Fix typo.

8
gcc/combine.c
View File

@ -10320,6 +10320,14 @@ simplify_comparison (code, pop0, pop1)
break;
case MINUS:
/* (op (minus A B) 0) -> (op A B) */
if (op1 == const0_rtx)
{
op1 = XEXP (op0, 1);
op0 = XEXP (op0, 0);
continue;
}
/* (eq (minus A B) C) -> (eq A (plus B C)) or
(eq B (minus A C)), whichever simplifies. We can only do
this for equality comparisons due to pathological cases involving