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x86: fold a few of the "alternative" NOP patterns

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Since named objects may not overlap, the compiler is not permitted to do
this for us, to avoid wasting space and cache bandwidth/capacity.
This commit is contained in:
Jan Beulich 2023-10-23 10:35:11 +02:00
parent ad9f323056
commit ae7067fb21
1 changed files with 3 additions and 6 deletions
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9
gas/config/tc-i386.c
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@ -1324,8 +1324,7 @@ static const unsigned char alt_3[] =
static const unsigned char alt_4[] =
{0x0f,0x1f,0x40,0x00};
/* nopl 0(%[re]ax,%[re]ax,1) */
static const unsigned char alt_5[] =
{0x0f,0x1f,0x44,0x00,0x00};
#define alt_5 (alt_6 + 1)
/* nopw 0(%[re]ax,%[re]ax,1) */
static const unsigned char alt_6[] =
{0x66,0x0f,0x1f,0x44,0x00,0x00};
@ -1333,14 +1332,12 @@ static const unsigned char alt_6[] =
static const unsigned char alt_7[] =
{0x0f,0x1f,0x80,0x00,0x00,0x00,0x00};
/* nopl 0L(%[re]ax,%[re]ax,1) */
static const unsigned char alt_8[] =
{0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00};
#define alt_8 (alt_9 + 1)
/* nopw 0L(%[re]ax,%[re]ax,1) */
static const unsigned char alt_9[] =
{0x66,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00};
/* nopw %cs:0L(%[re]ax,%[re]ax,1) */
static const unsigned char alt_10[] =
{0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00};
#define alt_10 (alt_11 + 1)
/* data16 nopw %cs:0L(%eax,%eax,1) */
static const unsigned char alt_11[] =
{0x66,0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00};