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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-09-28 01:11:50 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-20 22:35:43 +0200 |
| commit | ee607141242f7ac140a58b4869bf7b7909419629 (patch) | |
| tree | a2a8ce7149f668b6fb06f85e6613aed2977a82c0 | |
| parent | 4afcbe027c4f0571568ac00c7a7e086589001c9d (diff) | |
| download | sparse-ee607141242f7ac140a58b4869bf7b7909419629.tar.gz | |
sub: simplify C - (y + D) --> eval(C-D) - y
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 18 | ||||
| -rw-r--r-- | validation/optim/simplify-cte-sub-addr.c | 1 |
2 files changed, 18 insertions, 1 deletions
@@ -1157,6 +1157,22 @@ static int simplify_constant_rightside(struct instruction *insn) return 0; } +static int simplify_const_leftsub(struct instruction *insn, struct instruction *def) +{ + unsigned size = insn->size; + pseudo_t src1 = insn->src1; + + switch (def->opcode) { + case OP_ADD: + if (constant(def->src2)) { // C - (y + D) --> eval(C-D) - y + insn->src1 = eval_op(OP_SUB, size, src1, def->src2); + return replace_pseudo(insn, &insn->src2, def->src1); + } + break; + } + return 0; +} + static int simplify_constant_leftside(struct instruction *insn) { long long value = insn->src1->value; @@ -1177,6 +1193,8 @@ static int simplify_constant_leftside(struct instruction *insn) case OP_SUB: if (!value) // (0 - x) --> -x return replace_with_unop(insn, OP_NEG, insn->src2); + if (insn->src2->type == PSEUDO_REG) + return simplify_const_leftsub(insn, insn->src2->def); break; } return 0; diff --git a/validation/optim/simplify-cte-sub-addr.c b/validation/optim/simplify-cte-sub-addr.c index 81f5b345..bf36c8a0 100644 --- a/validation/optim/simplify-cte-sub-addr.c +++ b/validation/optim/simplify-cte-sub-addr.c @@ -3,7 +3,6 @@ int cte_sub_addr(int x) { return 2 - (x + 1); } /* * check-name: simplify-cte-sub-addr * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: sub\\..*\\$1, %arg1 |