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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-09-27 16:44:24 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-10-20 22:35:43 +0200 |
| commit | 3644b436dd8bcc34e2a0b6ed73a4d71fc5b023de (patch) | |
| tree | e5e6c874d468736804a77ce4aa829ce4853fd8b3 | |
| parent | 623d958c6953631f46612b50c4e8e8319d597a9b (diff) | |
| download | sparse-3644b436dd8bcc34e2a0b6ed73a4d71fc5b023de.tar.gz | |
sub: simplify (x + y) - x --> y
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 8 | ||||
| -rw-r--r-- | validation/optim/simplify-same-add-subl.c | 1 |
2 files changed, 8 insertions, 1 deletions
@@ -1382,9 +1382,17 @@ static int simplify_add(struct instruction *insn) static int simplify_sub(struct instruction *insn) { + pseudo_t src1 = insn->src1; pseudo_t src2 = insn->src2; struct instruction *def; + switch (DEF_OPCODE(def, src1)) { + case OP_ADD: + if (def->src1 == src2) // (x + y) - x --> y + return replace_with_pseudo(insn, def->src2); + break; + } + switch (DEF_OPCODE(def, src2)) { case OP_NEG: // (x - -y) --> (x + y) insn->opcode = OP_ADD; diff --git a/validation/optim/simplify-same-add-subl.c b/validation/optim/simplify-same-add-subl.c index 1f17ef0b..394e7dc5 100644 --- a/validation/optim/simplify-same-add-subl.c +++ b/validation/optim/simplify-same-add-subl.c @@ -3,7 +3,6 @@ int add_subl(int x, int y) { return (x + y) - x; } /* * check-name: simplify-same-add-subl * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-start add_subl: |