diff options
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 36a858536c7..919bea6aae2 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -649,24 +649,23 @@ simplify_unary_operation (enum rtx_code code, enum machine_mode mode, case CLZ: hv = 0; - if (h1 == 0) - lv = GET_MODE_BITSIZE (mode) - floor_log2 (l1) - 1; - else + if (h1 != 0) lv = GET_MODE_BITSIZE (mode) - floor_log2 (h1) - 1 - HOST_BITS_PER_WIDE_INT; + else if (l1 != 0) + lv = GET_MODE_BITSIZE (mode) - floor_log2 (l1) - 1; + else if (! CLZ_DEFINED_VALUE_AT_ZERO (mode, lv)) + lv = GET_MODE_BITSIZE (mode); break; case CTZ: hv = 0; - if (l1 == 0) - { - if (h1 == 0) - lv = GET_MODE_BITSIZE (mode); - else - lv = HOST_BITS_PER_WIDE_INT + exact_log2 (h1 & -h1); - } - else + if (l1 != 0) lv = exact_log2 (l1 & -l1); + else if (h1 != 0) + lv = HOST_BITS_PER_WIDE_INT + exact_log2 (h1 & -h1); + else if (! CTZ_DEFINED_VALUE_AT_ZERO (mode, lv)) + lv = GET_MODE_BITSIZE (mode); break; case POPCOUNT: |
