diff options
| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-09-28 01:19:21 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-20 22:35:43 +0200 |
| commit | c28f68be15dbbdcb6e6ed08fdff2b0aa89a426e9 (patch) | |
| tree | 6bcb13483d32f3fa0fa11913e529822324fbfd5b | |
| parent | ee607141242f7ac140a58b4869bf7b7909419629 (diff) | |
| download | sparse-dev-c28f68be15dbbdcb6e6ed08fdff2b0aa89a426e9.tar.gz | |
sub: simplify C - (D - z) --> z + eval(C-D)
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 8 | ||||
| -rw-r--r-- | validation/optim/simplify-cte-sub-subr.c | 1 |
2 files changed, 8 insertions, 1 deletions
@@ -1169,6 +1169,14 @@ static int simplify_const_leftsub(struct instruction *insn, struct instruction * return replace_pseudo(insn, &insn->src2, def->src1); } break; + case OP_SUB: + if (constant(def->src1)) { // C - (D - z) --> z + eval(C-D) + pseudo_t val = eval_op(OP_SUB, size, src1, def->src1); + insn->opcode = OP_ADD; + use_pseudo(insn, def->src2, &insn->src1); + return replace_pseudo(insn, &insn->src2, val); + } + break; } return 0; } diff --git a/validation/optim/simplify-cte-sub-subr.c b/validation/optim/simplify-cte-sub-subr.c index 950b233e..10fdbbc8 100644 --- a/validation/optim/simplify-cte-sub-subr.c +++ b/validation/optim/simplify-cte-sub-subr.c @@ -3,7 +3,6 @@ int cte_sub_subr(int x) { return 1 - (1 - x); } /* * check-name: simplify-cte-sub-subr * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: ret\\..* %arg1 |