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Fri Jan 31 13:15:05 1997 Alan Modra <alan@spri.levels.unisa.edu.au> 

* config/tc-i386.c (i386_align_code): Add comments explaining the
	nop instructions.
This commit is contained in:
Ian Lance Taylor 1997-01-31 18:16:15 +00:00
parent 20fa0902e7
commit fb50cd4ef2
2 changed files with 60 additions and 33 deletions
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5
gas/ChangeLog
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@ -1,3 +1,8 @@
Fri Jan 31 13:15:05 1997 Alan Modra <alan@spri.levels.unisa.edu.au>
* config/tc-i386.c (i386_align_code): Add comments explaining the
nop instructions.
Fri Jan 31 10:46:14 1997 Ian Lance Taylor <ian@cygnus.com>
* write.c (relax_segment): Give an error if a .space symbol is

88
gas/config/tc-i386.c
View File

@ -248,39 +248,61 @@ i386_align_code (fragP, count)
int count;
{
/* Various efficient no-op patterns for aligning code labels. */
static const char f32_1[] = {0x90};
static const char f32_2[] = {0x89,0xf6};
static const char f32_3[] = {0x8d,0x76,0x00};
static const char f32_4[] = {0x8d,0x74,0x26,0x00};
static const char f32_5[] = {0x90,
0x8d,0x74,0x26,0x00};
static const char f32_6[] = {0x8d,0xb6,0x00,0x00,0x00,0x00};
static const char f32_7[] = {0x8d,0xb4,0x26,0x00,0x00,0x00,0x00};
static const char f32_8[] = {0x90,
0x8d,0xb4,0x26,0x00,0x00,0x00,0x00};
static const char f32_9[] = {0x89,0xf6,
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00};
static const char f32_10[] = {0x8d,0x76,0x00,
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00};
static const char f32_11[] = {0x8d,0x74,0x26,0x00,
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00};
static const char f32_12[] = {0x8d,0xb6,0x00,0x00,0x00,0x00,
0x8d,0xbf,0x00,0x00,0x00,0x00};
static const char f32_13[] = {0x8d,0xb6,0x00,0x00,0x00,0x00,
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00};
static const char f32_14[] = {0x8d,0xb4,0x26,0x00,0x00,0x00,0x00,
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00};
static const char f32_15[] = {0xeb,0x0d,0x90,0x90,0x90,0x90,0x90,
0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90};
static const char f16_4[] = {0x8d,0xb6,0x00,0x00};
static const char f16_5[] = {0x90,
0x8d,0xb6,0x00,0x00};
static const char f16_6[] = {0x89,0xf6,
0x8d,0xbd,0x00,0x00};
static const char f16_7[] = {0x8d,0x76,0x00,
0x8d,0xbd,0x00,0x00};
static const char f16_8[] = {0x8d,0xb6,0x00,0x00,
0x8d,0xbd,0x00,0x00};
/* Note: Don't try to assemble the instructions in the comments. */
/* 0L and 0w are not legal */
static const char f32_1[] =
{0x90}; /* nop */
static const char f32_2[] =
{0x89,0xf6}; /* movl %esi,%esi */
static const char f32_3[] =
{0x8d,0x76,0x00}; /* leal 0(%esi),%esi */
static const char f32_4[] =
{0x8d,0x74,0x26,0x00}; /* leal 0(%esi,1),%esi */
static const char f32_5[] =
{0x90, /* nop */
0x8d,0x74,0x26,0x00}; /* leal 0(%esi,1),%esi */
static const char f32_6[] =
{0x8d,0xb6,0x00,0x00,0x00,0x00}; /* leal 0L(%esi),%esi */
static const char f32_7[] =
{0x8d,0xb4,0x26,0x00,0x00,0x00,0x00}; /* leal 0L(%esi,1),%esi */
static const char f32_8[] =
{0x90, /* nop */
0x8d,0xb4,0x26,0x00,0x00,0x00,0x00}; /* leal 0L(%esi,1),%esi */
static const char f32_9[] =
{0x89,0xf6, /* movl %esi,%esi */
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00}; /* leal 0L(%edi,1),%edi */
static const char f32_10[] =
{0x8d,0x76,0x00, /* leal 0(%esi),%esi */
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00}; /* leal 0L(%edi,1),%edi */
static const char f32_11[] =
{0x8d,0x74,0x26,0x00, /* leal 0(%esi,1),%esi */
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00}; /* leal 0L(%edi,1),%edi */
static const char f32_12[] =
{0x8d,0xb6,0x00,0x00,0x00,0x00, /* leal 0L(%esi),%esi */
0x8d,0xbf,0x00,0x00,0x00,0x00}; /* leal 0L(%edi),%edi */
static const char f32_13[] =
{0x8d,0xb6,0x00,0x00,0x00,0x00, /* leal 0L(%esi),%esi */
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00}; /* leal 0L(%edi,1),%edi */
static const char f32_14[] =
{0x8d,0xb4,0x26,0x00,0x00,0x00,0x00, /* leal 0L(%esi,1),%esi */
0x8d,0xbc,0x27,0x00,0x00,0x00,0x00}; /* leal 0L(%edi,1),%edi */
static const char f32_15[] =
{0xeb,0x0d,0x90,0x90,0x90,0x90,0x90, /* jmp .+15; lotsa nops */
0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90};
static const char f16_4[] =
{0x8d,0xb6,0x00,0x00}; /* lea 0w(%si),%si */
static const char f16_5[] =
{0x90, /* nop */
0x8d,0xb6,0x00,0x00}; /* lea 0w(%si),%si */
static const char f16_6[] =
{0x89,0xf6, /* mov %si,%si */
0x8d,0xbd,0x00,0x00}; /* lea 0w(%di),%di */
static const char f16_7[] =
{0x8d,0x76,0x00, /* lea 0(%si),%si */
0x8d,0xbd,0x00,0x00}; /* lea 0w(%di),%di */
static const char f16_8[] =
{0x8d,0xb6,0x00,0x00, /* lea 0w(%si),%si */
0x8d,0xbd,0x00,0x00}; /* lea 0w(%di),%di */
static const char *const f32_patt[] = {
f32_1, f32_2, f32_3, f32_4, f32_5, f32_6, f32_7, f32_8,
f32_9, f32_10, f32_11, f32_12, f32_13, f32_14, f32_15