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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2020-12-17 01:43:53 +0100 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2021-04-19 00:56:36 +0200 |
| commit | 98075702ca78ff79e568a6b8004ee5fad7b0bfbe (patch) | |
| tree | 0e0db9ea6d88682b5efb0c469eb4a92f1fd06f98 | |
| parent | e1f6c18b602e9d5c61100c57bf675484db6c8826 (diff) | |
| download | sparse-98075702ca78ff79e568a6b8004ee5fad7b0bfbe.tar.gz | |
simplify TRUNC(NOT(x)) --> NOT(TRUNC(x))
The goal is double:
1) be able to do the NOT operation on the smaller type
2) more importantly, give the opportunity to the TRUNC to
cancel with a previous ZEXT if there is one.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 15 | ||||
| -rw-r--r-- | validation/optim/trunc-not0.c | 1 |
2 files changed, 15 insertions, 1 deletions
@@ -2288,6 +2288,21 @@ static int simplify_cast(struct instruction *insn) return replace_pseudo(insn, &insn->src1, def->src1); } break; + case OP_NOT: + switch (insn->opcode) { + case OP_TRUNC: + if (one_use(src)) { + // TRUNC(NOT(x)) --> NOT(TRUNC(x)) + insn->opcode = OP_NOT; + def->orig_type = def->type; + def->opcode = OP_TRUNC; + def->type = insn->type; + def->size = insn->size; + return REPEAT_CSE; + } + break; + } + break; case OP_OR: switch (insn->opcode) { case OP_TRUNC: diff --git a/validation/optim/trunc-not0.c b/validation/optim/trunc-not0.c index febed165..882b446d 100644 --- a/validation/optim/trunc-not0.c +++ b/validation/optim/trunc-not0.c @@ -14,7 +14,6 @@ static _Bool ubar(uint64 a) { return (~(uint32) ~a) == (uint32)a; } /* * check-name: trunc-not0 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-returns: 1 |