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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-09-30 00:36:27 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-24 22:58:26 +0200 |
| commit | f96c229c9ae80b40249f3ff46baa035210bbec53 (patch) | |
| tree | 0b23abaca31b6721417969f263e8f547c4327d3b /simplify.c | |
| parent | 70a22c03f856b3997d2c7dddd761daf0da3e3b1e (diff) | |
| download | sparse-dev-f96c229c9ae80b40249f3ff46baa035210bbec53.tar.gz | |
unop: simplify ~(C - x) --> x + ~C
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Diffstat (limited to 'simplify.c')
| -rw-r--r-- | simplify.c | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -1471,6 +1471,12 @@ 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: |