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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2021-01-04 00:20:06 +0100 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2021-03-10 22:42:45 +0100 |
| commit | cbafd33d81b31159929cc484a908868f2b6cc5bc (patch) | |
| tree | ddd8af2fea4df27e8ecf1b408397001c94b7c6f0 | |
| parent | e5ac481d66869dae85367311056a613ed0fcdb00 (diff) | |
| download | sparse-cbafd33d81b31159929cc484a908868f2b6cc5bc.tar.gz | |
simplify (x & M) {==,!=} C
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 8 | ||||
| -rw-r--r-- | validation/optim/cmpe-and0.c | 1 |
2 files changed, 8 insertions, 1 deletions
@@ -1263,6 +1263,14 @@ static int simplify_compare_constant(struct instruction *insn, long long value) break; bits = def->src2->value; switch (insn->opcode) { + case OP_SET_EQ: + if ((value & bits) != value) + return replace_with_value(insn, 0); + break; + case OP_SET_NE: + if ((value & bits) != value) + return replace_with_value(insn, 1); + break; case OP_SET_LE: value = sign_extend(value, def->size); if (bits & sign_bit(def->size)) diff --git a/validation/optim/cmpe-and0.c b/validation/optim/cmpe-and0.c index 7db60836..75af7752 100644 --- a/validation/optim/cmpe-and0.c +++ b/validation/optim/cmpe-and0.c @@ -4,7 +4,6 @@ int cmpe_and_ne(int a) { return ((a & 0xff00) != 0xff01) + 0; } /* * check-name: cmpe-and0 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-returns: 1 |