Not really a simplification in itself but it make some other
simplification a little easier (already because there is one
argument less to be matched).
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 4 ++++
validation/optim/simplify-zero-sub.c | 1 -
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index f837b003efd4..aa0357d9e285 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1174,6 +1174,10 @@ static int simplify_constant_leftside(struct instruction *insn)
if (!value)
return replace_with_pseudo(insn, insn->src1);
return 0;
+ case OP_SUB:
+ if (!value) // (0 - x) --> -x
+ return replace_with_unop(insn, OP_NEG, insn->src2);
+ break;
}
return 0;
}
diff --git a/validation/optim/simplify-zero-sub.c b/validation/optim/simplify-zero-sub.c
index cc8fe7a3159b..70ce7c908844 100644
--- a/validation/optim/simplify-zero-sub.c
+++ b/validation/optim/simplify-zero-sub.c
@@ -3,7 +3,6 @@ int zero_sub(int x) { return 0 - x; }
/*
* check-name: simplify-zero-sub
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-contains: neg\\..* %arg1
--
2.28.0
