From 8a0224432d82087c5c835e9db045a69fb588fd56 Mon Sep 17 00:00:00 2001 From: John Wehle Date: Fri, 15 May 1998 00:29:27 +0000 Subject: [PATCH] i386.h (DATA_ALIGNMENT): Define. * i386.h (DATA_ALIGNMENT): Define. Improve x86 FP performance. From-SVN: r19765 --- gcc/ChangeLog | 4 ++++ gcc/config/i386/i386.h | 48 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fce1cc54f2f..b53497c908d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 * reload1.c (delete_output_reload): Ignore single USE that diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h index ef344b2803d..1053bd9c242 100644 --- a/gcc/config/i386/i386.h +++ b/gcc/config/i386/i386.h @@ -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 -- 2.30.2