mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-03-08 12:57:22 +08:00
Code Issues Packages Projects Releases Wiki Activity

i386.h (DATA_ALIGNMENT): Define.

Browse Source 
* i386.h (DATA_ALIGNMENT): Define.
Improve x86 FP performance.

From-SVN: r19765
This commit is contained in:
John Wehle 1998-05-15 00:29:27 +00:00 committed by Jeff Law
parent aa6498c297
commit 8a0224432d
2 changed files with 52 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
Fri May 15 01:29:39 1998 John Wehle (john@feith.com)
* i386.h (DATA_ALIGNMENT): Define.
Fri May 15 05:35:37 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* reload1.c (delete_output_reload): Ignore single USE that

48
gcc/config/i386/i386.h
View File

@ -422,6 +422,54 @@ extern int ix86_arch;
/* align DFmode constants and nonaggregates */
#define ALIGN_DFmode (!TARGET_386)
/* If defined, a C expression to compute the alignment for a static
variable. TYPE is the data type, and ALIGN is the alignment that
the object would ordinarily have. The value of this macro is used
instead of that alignment to align the object.
If this macro is not defined, then ALIGN is used.
One use of this macro is to increase alignment of medium-size
data to make it all fit in fewer cache lines. Another is to
cause character arrays to be word-aligned so that `strcpy' calls
that copy constants to character arrays can be done inline. */
#define DATA_ALIGNMENT(TYPE, ALIGN) \
((AGGREGATE_TYPE_P (TYPE) \
&& TYPE_SIZE (TYPE) \
&& TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
&& (TREE_INT_CST_LOW (TYPE_SIZE (TYPE)) >= 256 \
|| TREE_INT_CST_HIGH (TYPE_SIZE (TYPE))) && (ALIGN) < 256) \
? 256 \
: TREE_CODE (TYPE) == ARRAY_TYPE \
? ((TYPE_MODE (TREE_TYPE (TYPE)) == DFmode && (ALIGN) < 64) \
? 64 \
: (TYPE_MODE (TREE_TYPE (TYPE)) == XFmode && (ALIGN) < 128) \
? 128 \
: (ALIGN)) \
: TREE_CODE (TYPE) == COMPLEX_TYPE \
? ((TYPE_MODE (TYPE) == DCmode && (ALIGN) < 64) \
? 64 \
: (TYPE_MODE (TYPE) == XCmode && (ALIGN) < 128) \
? 128 \
: (ALIGN)) \
: ((TREE_CODE (TYPE) == RECORD_TYPE \
|| TREE_CODE (TYPE) == UNION_TYPE \
|| TREE_CODE (TYPE) == QUAL_UNION_TYPE) \
&& TYPE_FIELDS (TYPE)) \
? ((DECL_MODE (TYPE_FIELDS (TYPE)) == DFmode && (ALIGN) < 64) \
? 64 \
: (DECL_MODE (TYPE_FIELDS (TYPE)) == XFmode && (ALIGN) < 128) \
? 128 \
: (ALIGN)) \
: TREE_CODE (TYPE) == REAL_TYPE \
? ((TYPE_MODE (TYPE) == DFmode && (ALIGN) < 64) \
? 64 \
: (TYPE_MODE (TYPE) == XFmode && (ALIGN) < 128) \
? 128 \
: (ALIGN)) \
: (ALIGN))
/* Set this non-zero if move instructions will actually fail to work
when given unaligned data. */
#define STRICT_ALIGNMENT 0