diff options
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 0bef69e986f..fb80219155c 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -1844,9 +1844,11 @@ simplify_binary_operation (enum rtx_code code, enum machine_mode mode, case AND: if (trueop1 == const0_rtx && ! side_effects_p (op0)) return const0_rtx; + /* If we are turning off bits already known off in OP0, we need + not do an AND. */ if (GET_CODE (trueop1) == CONST_INT - && ((INTVAL (trueop1) & GET_MODE_MASK (mode)) - == GET_MODE_MASK (mode))) + && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT + && (nonzero_bits (trueop0, mode) & ~INTVAL (trueop1)) == 0) return op0; if (trueop0 == trueop1 && ! side_effects_p (op0) && GET_MODE_CLASS (mode) != MODE_CC) |