diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index a4396c2..31b8241 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -363,7 +363,25 @@ store_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, meaningful at a much higher level; when structures are copied between memory and regs, the higher-numbered regs always get higher addresses. */ - bitnum += SUBREG_BYTE (op0) * BITS_PER_UNIT; + int inner_mode_size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0))); + int outer_mode_size = GET_MODE_SIZE (GET_MODE (op0)); + + byte_offset = 0; + + /* Paradoxical subregs need special handling on big endian machines. */ + if (SUBREG_BYTE (op0) == 0 && inner_mode_size < outer_mode_size) + { + int difference = inner_mode_size - outer_mode_size; + + if (WORDS_BIG_ENDIAN) + byte_offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD; + if (BYTES_BIG_ENDIAN) + byte_offset += difference % UNITS_PER_WORD; + } + else + byte_offset = SUBREG_BYTE (op0); + + bitnum += byte_offset * BITS_PER_UNIT; op0 = SUBREG_REG (op0); } |