diff options
Diffstat (limited to 'gcc-4.9/gcc/expmed.c')
| -rw-r--r-- | gcc-4.9/gcc/expmed.c | 32 |
1 files changed, 10 insertions, 22 deletions
diff --git a/gcc-4.9/gcc/expmed.c b/gcc-4.9/gcc/expmed.c index 6e9975df3..0124a213b 100644 --- a/gcc-4.9/gcc/expmed.c +++ b/gcc-4.9/gcc/expmed.c @@ -463,7 +463,7 @@ strict_volatile_bitfield_p (rtx op0, unsigned HOST_WIDE_INT bitsize, /* Check for cases where the C++ memory model applies. */ if (bitregion_end != 0 && (bitnum - bitnum % modesize < bitregion_start - || bitnum - bitnum % modesize + modesize > bitregion_end)) + || bitnum - bitnum % modesize + modesize - 1 > bitregion_end)) return false; return true; @@ -679,28 +679,13 @@ store_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, || (bitsize % BITS_PER_WORD == 0 && bitnum % BITS_PER_WORD == 0))) { /* Use the subreg machinery either to narrow OP0 to the required - words or to cope with mode punning between equal-sized modes. - In the latter case, use subreg on the rhs side, not lhs. */ - rtx sub; - - if (bitsize == GET_MODE_BITSIZE (GET_MODE (op0))) - { - sub = simplify_gen_subreg (GET_MODE (op0), value, fieldmode, 0); - if (sub) - { - emit_move_insn (op0, sub); - return true; - } - } - else - { - sub = simplify_gen_subreg (fieldmode, op0, GET_MODE (op0), + words or to cope with mode punning between equal-sized modes. */ + rtx sub = simplify_gen_subreg (fieldmode, op0, GET_MODE (op0), bitnum / BITS_PER_UNIT); - if (sub) - { - emit_move_insn (sub, value); - return true; - } + if (sub) + { + emit_move_insn (sub, value); + return true; } } @@ -3321,6 +3306,9 @@ expand_widening_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, enum mult_variant variant; struct algorithm algorithm; + if (coeff == 0) + return CONST0_RTX (mode); + /* Special case powers of two. */ if (EXACT_POWER_OF_2_OR_ZERO_P (coeff)) { |