diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 5dc4fc8879b..3599168769f 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -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 |