git
/
gcc
mirror of git://gcc.gnu.org/git/gcc.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

expmed.c (store_bit_field): Consider naturally aligned memory for direct reference. 

* expmed.c (store_bit_field): Consider naturally aligned
        memory for direct reference.

From-SVN: r36431
This commit is contained in:
Richard Henderson 2000-09-15 04:13:04 -07:00 committed by Richard Henderson
parent e01acbb16e
commit 308ecea098
2 changed files with 20 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2000-09-15 Richard Henderson <rth@cygnus.com>
* expmed.c (store_bit_field): Consider naturally aligned
memory for direct reference.
2000-09-15 Richard Henderson <rth@cygnus.com>
* config/alpha/alpha.c (alpha_expand_unaligned_load): Force all

27
gcc/expmed.c
View File

@ -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)