diff options
| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-09-15 11:13:04 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-09-15 11:13:04 +0000 |
| commit | 9e527b97e3bf28ac48240500fc078b4f1d4c8af7 (patch) | |
| tree | 5c3d481d792fb5e4774cbae90ba4d86701a9ca24 /gcc/expmed.c | |
| parent | 3024e9f8b3c2dc22bbbab8133a7cbf290a7c411c (diff) | |
| download | gcc-9e527b97e3bf28ac48240500fc078b4f1d4c8af7.tar.gz | |
* expmed.c (store_bit_field): Consider naturally aligned
memory for direct reference.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@36431 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 606333fdbe3..e2ca70a13ab 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -297,19 +297,22 @@ store_bit_field (str_rtx, bitsize, bitnum, fieldmode, value, align, total_size) if (flag_force_mem) value = force_not_mem (value); - if ((GET_MODE_SIZE (fieldmode) >= UNITS_PER_WORD - || (GET_MODE_SIZE (GET_MODE (op0)) == GET_MODE_SIZE (fieldmode) - && GET_MODE_SIZE (fieldmode) != 0)) - && (GET_CODE (op0) != MEM - || ! SLOW_UNALIGNED_ACCESS (fieldmode, align) - || (offset * BITS_PER_UNIT % bitsize == 0 - && align % GET_MODE_BITSIZE (fieldmode) == 0)) - && (BYTES_BIG_ENDIAN ? bitpos + bitsize == unit : bitpos == 0) - && bitsize == GET_MODE_BITSIZE (fieldmode)) + /* If the target is a register, overwriting the entire object, or storing + a full-word or multi-word field can be done with just a SUBREG. + + If the target is memory, storing any naturally aligned field can be + done with a simple store. For targets that support fast unaligned + memory, any naturally sized, unit aligned field can be done directly. */ + + if (bitsize == GET_MODE_BITSIZE (fieldmode) + && (GET_MODE_SIZE (fieldmode) >= UNITS_PER_WORD + || GET_MODE_SIZE (GET_MODE (op0)) == GET_MODE_SIZE (fieldmode) + || (GET_CODE (op0) == MEM + && (! SLOW_UNALIGNED_ACCESS (fieldmode, align) + || (offset * BITS_PER_UNIT % bitsize == 0 + && align % GET_MODE_BITSIZE (fieldmode) == 0)))) + && (BYTES_BIG_ENDIAN ? bitpos + bitsize == unit : bitpos == 0)) { - /* Storing in a full-word or multi-word field in a register - can be done with just SUBREG. Also, storing in the entire object - can be done with just SUBREG. */ if (GET_MODE (op0) != fieldmode) { if (GET_CODE (op0) == SUBREG) |