Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 6 ++++++
validation/optim/simplify-not-sub-cte.c | 1 -
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index 63431b3d00b1..8173777652af 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1472,6 +1472,12 @@ static int simplify_unop(struct instruction *insn)
return replace_pseudo(insn, &insn->src1, src);
case OP_NOT: // ~(~x) --> x
return replace_with_pseudo(insn, def->src);
+ case OP_SUB:
+ if (!constant(def->src1))
+ break;
+ insn->opcode = OP_ADD; // ~(C - x) --> x + ~C
+ insn->src2 = eval_unop(OP_NOT, insn->size, def->src1);
+ return replace_pseudo(insn, &insn->src1, def->src2);
}
break;
case OP_NEG:
diff --git a/validation/optim/simplify-not-sub-cte.c b/validation/optim/simplify-not-sub-cte.c
index ec105beb31fe..1ea73ece2e27 100644
--- a/validation/optim/simplify-not-sub-cte.c
+++ b/validation/optim/simplify-not-sub-cte.c
@@ -5,7 +5,6 @@ int foo(int x) { return ~(C - x) == (x + ~C); }
/*
* check-name: simplify-not-sub-cte
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-contains: ret\\..*\\$1
--
2.28.0
