From: Jan Beulich <jbeulich@suse.com>
Date: Mon, 23 Oct 2023 08:35:11 +0000 (+0200)
Subject: x86: fold a few of the "alternative" NOP patterns
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ae7067fb21899c03ff9e12f95730cfa1d649c7dd;p=binutils-gdb.git

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

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 --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 2b327b0affb..57ae6c522a7 100644
--- 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};