diff options
| -rw-r--r-- | simplify.c | 6 | ||||
| -rw-r--r-- | validation/optim/lsr-and0.c | 1 |
2 files changed, 5 insertions, 2 deletions
@@ -621,7 +621,7 @@ static int simplify_or_lsr(struct instruction *insn, pseudo_t src, pseudo_t othe static int simplify_shift(struct instruction *insn, pseudo_t pseudo, long long value) { struct instruction *def; - unsigned long long mask, omask; + unsigned long long mask, omask, nmask; unsigned long long nval; unsigned int size; pseudo_t src2; @@ -680,7 +680,11 @@ static int simplify_shift(struct instruction *insn, pseudo_t pseudo, long long v // by (A >> S) & (M >> S) if (!constant(def->src2)) break; + mask = bits_mask(insn->size - value) << value; omask = def->src2->value; + nmask = omask & mask; + if (nmask == 0) + return replace_with_pseudo(insn, value_pseudo(0)); if (nbr_users(pseudo) > 1) break; def->opcode = OP_LSR; diff --git a/validation/optim/lsr-and0.c b/validation/optim/lsr-and0.c index 292c0332..94310ba8 100644 --- a/validation/optim/lsr-and0.c +++ b/validation/optim/lsr-and0.c @@ -7,7 +7,6 @@ unsigned lsr_and0(unsigned x) /* * check-name: lsr-and0 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: ret\\..*\\$0$ |