diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 92c2938..59f81df 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -624,13 +624,28 @@ 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. */ - rtx sub = simplify_gen_subreg (fieldmode, op0, GET_MODE (op0), - bitnum / BITS_PER_UNIT); - if (sub) + 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))) { - emit_move_insn (sub, value); - return true; + 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), + bitnum / BITS_PER_UNIT); + if (sub) + { + emit_move_insn (sub, value); + return true; + } } } |