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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2021-01-31 15:22:56 +0100 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2021-03-10 22:42:45 +0100 |
| commit | 2bfb96f9259583a798306df212799c3103ab0e34 (patch) | |
| tree | f94099e743a26e8b8ccd5abfc711073ff28bfddd | |
| parent | cbafd33d81b31159929cc484a908868f2b6cc5bc (diff) | |
| download | sparse-2bfb96f9259583a798306df212799c3103ab0e34.tar.gz | |
simplify (x | M) {==,!=} C
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | simplify.c | 15 | ||||
| -rw-r--r-- | validation/optim/cmpe-or0.c | 1 |
2 files changed, 15 insertions, 1 deletions
@@ -1311,6 +1311,21 @@ static int simplify_compare_constant(struct instruction *insn, long long value) break; } break; + case OP_OR: + if (!constant(def->src2)) + break; + bits = def->src2->value; + switch (insn->opcode) { + case OP_SET_EQ: + if ((value & bits) != bits) + return replace_with_value(insn, 0); + break; + case OP_SET_NE: + if ((value & bits) != bits) + return replace_with_value(insn, 1); + break; + } + break; case OP_SEXT: // sext(x) cmp C --> x cmp trunc(C) osize = def->orig_type->bit_size; if (is_signed_constant(value, osize, size)) { diff --git a/validation/optim/cmpe-or0.c b/validation/optim/cmpe-or0.c index bef23161..2e89d611 100644 --- a/validation/optim/cmpe-or0.c +++ b/validation/optim/cmpe-or0.c @@ -4,7 +4,6 @@ int cmp_ne(int a) { return ((a | 1) == 0) + 1; } /* * check-name: cmpe-or0 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-returns: 1 |