diff options
Diffstat (limited to 'gcc/config/rs6000/rs6000.cc')
| -rw-r--r-- | gcc/config/rs6000/rs6000.cc | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 1c60695..764b499 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -10320,15 +10320,18 @@ can_be_rotated_to_negative_lis (HOST_WIDE_INT c, int *rot) /* case b. xx0..01..1xx: some of 15 x's (and some of 16 0's) are rotated over the highest bit. */ - int pos_one = clz_hwi ((c << 16) >> 16); - middle_zeros = ctz_hwi (c >> (HOST_BITS_PER_WIDE_INT - pos_one)); - int middle_ones = clz_hwi (~(c << pos_one)); - if (middle_zeros >= 16 && middle_ones >= 33) + unsigned HOST_WIDE_INT uc = c; + int pos_one = clz_hwi ((HOST_WIDE_INT) (uc << 16) >> 16); + if (pos_one != 0) { - *rot = pos_one; - return true; + middle_zeros = ctz_hwi (c >> (HOST_BITS_PER_WIDE_INT - pos_one)); + int middle_ones = clz_hwi (~(uc << pos_one)); + if (middle_zeros >= 16 && middle_ones >= 33) + { + *rot = pos_one; + return true; + } } - return false; } @@ -10445,7 +10448,8 @@ can_be_built_by_li_and_rldic (HOST_WIDE_INT c, int *shift, HOST_WIDE_INT *mask) if (lz >= HOST_BITS_PER_WIDE_INT) return false; - int middle_ones = clz_hwi (~(c << lz)); + unsigned HOST_WIDE_INT uc = c; + int middle_ones = clz_hwi (~(uc << lz)); if (tz + lz + middle_ones >= ones && (tz - lz) < HOST_BITS_PER_WIDE_INT && tz < HOST_BITS_PER_WIDE_INT) @@ -10479,7 +10483,7 @@ can_be_built_by_li_and_rldic (HOST_WIDE_INT c, int *shift, HOST_WIDE_INT *mask) if (!IN_RANGE (pos_first_1, 1, HOST_BITS_PER_WIDE_INT-1)) return false; - middle_ones = clz_hwi (~c << pos_first_1); + middle_ones = clz_hwi ((~(unsigned HOST_WIDE_INT) c) << pos_first_1); middle_zeros = ctz_hwi (c >> (HOST_BITS_PER_WIDE_INT - pos_first_1)); if (pos_first_1 < HOST_BITS_PER_WIDE_INT && middle_ones + middle_zeros < HOST_BITS_PER_WIDE_INT @@ -10581,7 +10585,8 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c, int *num_insns) { /* li/lis; rldicX */ unsigned HOST_WIDE_INT imm = (c | ~mask); - imm = (imm >> shift) | (imm << (HOST_BITS_PER_WIDE_INT - shift)); + if (shift != 0) + imm = (imm >> shift) | (imm << (HOST_BITS_PER_WIDE_INT - shift)); count_or_emit_insn (temp, GEN_INT (imm)); if (shift != 0) |