Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 4 ++++
validation/optim/simplify-same-subl-add.c | 1 -
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index 08b706ca8f41..48bf48d29f9a 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1396,6 +1396,10 @@ static int simplify_sub(struct instruction *insn)
}
switch (DEF_OPCODE(def, src2)) {
+ case OP_ADD:
+ if (src1 == def->src1) // x - (x + z) --> -z
+ return replace_with_unop(insn, OP_NEG, def->src2);
+ break;
case OP_NEG: // (x - -y) --> (x + y)
insn->opcode = OP_ADD;
return replace_pseudo(insn, &insn->src2, def->src);
diff --git a/validation/optim/simplify-same-subl-add.c b/validation/optim/simplify-same-subl-add.c
index dbc0fe97f126..e7ae08092556 100644
--- a/validation/optim/simplify-same-subl-add.c
+++ b/validation/optim/simplify-same-subl-add.c
@@ -3,7 +3,6 @@ int subl_add(int x, int y) { return x - (x + y); }
/*
* check-name: simplify-same-subl-add
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-contains: neg\\..* %arg2
--
2.28.0
