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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-09-28 01:24:45 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-24 22:57:44 +0200 |
| commit | 9577415162562118976aef3d5c11765882186366 (patch) | |
| tree | 431b48d4a9d7840deba9eba6fe043f0ceeaadd5b | |
| parent | 851d925ad7aad00f52a9386374752fd2246d2464 (diff) | |
| download | sparse-9577415162562118976aef3d5c11765882186366.tar.gz | |
unop: simplify -(x - y) --> y - x
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 4 | ||||
| -rw-r--r-- | validation/optim/simplify-neg-sub.c | 1 |
2 files changed, 4 insertions, 1 deletions
@@ -1477,6 +1477,10 @@ static int simplify_unop(struct instruction *insn) return replace_pseudo(insn, &insn->src1, src); case OP_NEG: // -(-x) --> x return replace_with_pseudo(insn, def->src); + case OP_SUB: + insn->opcode = OP_SUB; // -(x - y) --> y - x + use_pseudo(insn, def->src1, &insn->src2); + return replace_pseudo(insn, &insn->src1, def->src2); } break; default: diff --git a/validation/optim/simplify-neg-sub.c b/validation/optim/simplify-neg-sub.c index b73c9e5e..9a824f09 100644 --- a/validation/optim/simplify-neg-sub.c +++ b/validation/optim/simplify-neg-sub.c @@ -3,7 +3,6 @@ int foo(int x, int y) { return -(x - y) == (y - x); } /* * check-name: simplify-neg-sub * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: ret\\..*\\$1 |