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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2019-12-18 00:07:58 +0100 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-24 22:59:10 +0200 |
| commit | 3b9ae3404df8a067f0aa487c9606ee14f7ef2418 (patch) | |
| tree | ddd530649dce249a58665532adb12ab565971803 | |
| parent | 4fceb3aa691dc4e6ba5480aa693cc2231788f2b4 (diff) | |
| download | sparse-3b9ae3404df8a067f0aa487c9606ee14f7ef2418.tar.gz | |
unop: simplify ~(-x) --> x - 1
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 4 | ||||
| -rw-r--r-- | validation/optim/simplify-not-neg.c | 1 |
2 files changed, 4 insertions, 1 deletions
@@ -1469,6 +1469,10 @@ static int simplify_unop(struct instruction *insn) src = eval_unop(OP_NOT, insn->size, def->src2); use_pseudo(insn, def->src1, &insn->src2); return replace_pseudo(insn, &insn->src1, src); + case OP_NEG: + insn->opcode = OP_SUB; // ~(-x) --> x - 1 + insn->src2 = value_pseudo(1); + return replace_pseudo(insn, &insn->src1, def->src); case OP_NOT: // ~(~x) --> x return replace_with_pseudo(insn, def->src); case OP_SUB: diff --git a/validation/optim/simplify-not-neg.c b/validation/optim/simplify-not-neg.c index b9675ea6..3fd8400d 100644 --- a/validation/optim/simplify-not-neg.c +++ b/validation/optim/simplify-not-neg.c @@ -3,7 +3,6 @@ int foo(int x) { return ~(-x) == (x - 1); } /* * check-name: simplify-not-neg * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: ret\\..*\\$1 |