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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2016-12-18 18:13:04 +0100 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-20 22:35:43 +0200 |
| commit | 623d958c6953631f46612b50c4e8e8319d597a9b (patch) | |
| tree | a6a1e39da8705a3b2ec61c08094ed5f757a45da4 | |
| parent | 26a8e420cd5b5e45e0d482fc5455e8d4087f7282 (diff) | |
| download | sparse-623d958c6953631f46612b50c4e8e8319d597a9b.tar.gz | |
add: simplify (-x + y) --> (y - x)
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 8 | ||||
| -rw-r--r-- | validation/optim/simplify-neg-add.c | 1 |
2 files changed, 8 insertions, 1 deletions
@@ -1360,9 +1360,17 @@ static int simplify_associative_binop(struct instruction *insn) static int simplify_add(struct instruction *insn) { + pseudo_t src1 = insn->src1; pseudo_t src2 = insn->src2; struct instruction *def; + switch (DEF_OPCODE(def, src1)) { + case OP_NEG: // (-x + y) --> (y - x) + switch_pseudo(insn, &insn->src1, insn, &insn->src2); + insn->opcode = OP_SUB; + return replace_pseudo(insn, &insn->src2, def->src); + } + switch (DEF_OPCODE(def, src2)) { case OP_NEG: // (x + -y) --> (x - y) insn->opcode = OP_SUB; diff --git a/validation/optim/simplify-neg-add.c b/validation/optim/simplify-neg-add.c index 66a820f2..6223b4f9 100644 --- a/validation/optim/simplify-neg-add.c +++ b/validation/optim/simplify-neg-add.c @@ -3,7 +3,6 @@ int neg_add(int x, int y) { return -x + y; } /* * check-name: simplify-neg-add * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: sub\\..*%arg2, %arg1 |