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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2018-07-02 00:20:25 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2018-07-23 13:11:20 +0200 |
| commit | 548f00d19561881ba176c8acfaf9121ddacb80e8 (patch) | |
| tree | 605f4d88bb9c743ae27f4da878728277e1268106 | |
| parent | a8e1df57346cb6a456e36d82c5d50a159479ba5d (diff) | |
| download | sparse-dev-548f00d19561881ba176c8acfaf9121ddacb80e8.tar.gz | |
cast: simplify [SZ]EXT + TRUNC to original size
An OP_ZEXT/OP_SEXT following by a OP_TRUNC to the original size is a NOP.
Simplify away such OP_TRUNC.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 10 | ||||
| -rw-r--r-- | validation/optim/ext-trunc-same.c | 1 |
2 files changed, 10 insertions, 1 deletions
@@ -1008,6 +1008,16 @@ static int simplify_cast(struct instruction *insn) return replace_pseudo(insn, &insn->src1, def->src); } break; + case OP_ZEXT: + case OP_SEXT: + switch (insn->opcode) { + case OP_TRUNC: + osize = def->orig_type->bit_size; + if (size == osize) + return replace_with_pseudo(insn, def->src); + break; + } + break; } return 0; diff --git a/validation/optim/ext-trunc-same.c b/validation/optim/ext-trunc-same.c index 634fdb87..2bfcf030 100644 --- a/validation/optim/ext-trunc-same.c +++ b/validation/optim/ext-trunc-same.c @@ -11,7 +11,6 @@ short ueq(unsigned short x) /* * check-name: ext-trunc-same * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-excludes: trunc\\. |