diff mbox series

[09/11] x86: fold a few of the "alternative" NOP patterns

Message ID b5e9a399-ea6c-5dd1-d7b0-79a01083d607@suse.com
State New
Headers
Series x86: NOP emission adjustments |

Checks

Context Check Description
linaro-tcwg-bot/tcwg_binutils_check--master-aarch64 success Testing passed
linaro-tcwg-bot/tcwg_binutils_check--master-arm success Testing passed
linaro-tcwg-bot/tcwg_binutils_build--master-arm success Testing passed
linaro-tcwg-bot/tcwg_binutils_build--master-aarch64 success Testing passed

Commit Message

Jan Beulich Sept. 27, 2023, 3:52 p.m. UTC 
  Since named objects may not overlap, the compiler is not permitted to do
this for us, to avoid wasting space and cache bandwidth/capacity.
diff mbox series

Patch

--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -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};