diff options
| -rw-r--r-- | simplify.c | 11 | ||||
| -rw-r--r-- | validation/optim/shl-and0.c | 1 |
2 files changed, 11 insertions, 1 deletions
@@ -720,6 +720,17 @@ static int simplify_shift(struct instruction *insn, pseudo_t pseudo, long long v if (value >= size) goto zero; switch(DEF_OPCODE(def, pseudo)) { + case OP_AND: + // simplify (A & M) << S + if (!constant(def->src2)) + break; + mask = bits_mask(insn->size) >> value; + omask = def->src2->value; + nmask = omask & mask; + if (nmask == 0) + return replace_with_pseudo(insn, value_pseudo(0)); + // do not simplify into ((A << S) & (M << S)) + break; case OP_LSR: // replace ((x >> S) << S) // by (x & (-1 << S)) diff --git a/validation/optim/shl-and0.c b/validation/optim/shl-and0.c index 289859ae..894bd882 100644 --- a/validation/optim/shl-and0.c +++ b/validation/optim/shl-and0.c @@ -7,7 +7,6 @@ unsigned shl_and0(unsigned x) /* * check-name: shl-and0 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-contains: ret\\..*\\$0$ |