@@ -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);
@@ -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
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com> --- simplify.c | 4 ++++ validation/optim/simplify-same-subl-add.c | 1 - 2 files changed, 4 insertions(+), 1 deletion(-)