From: Thiago Macieira <thiago.macieira@intel.com>
Date: Tue, 24 Apr 2012 14:27:35 +0000 (+0200)
Subject: Replace the x86 XGETBV instruction with its opcode bytes
X-Git-Tag: 071012110112~1395
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e75b0e8c72008f800704828cd4f1eae97b523848;p=profile%2Fivi%2Fqtbase.git

Replace the x86 XGETBV instruction with its opcode bytes

This is a new instruction, present on the SandyBridge architecture and
later. Some older assemblers do not support it and produce:

  {standard input}:225:no such instruction: `xgetbv'

The use of this instruction is protected by a CPUID check (function 1,
ECX bit 27), so we only run it in processors that do support it.

Change-Id: Ife7500c0deaab9539074835a4511e8c19602608e
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
---

diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp
index 6a790a4..5d95d7c 100644
--- a/src/corelib/tools/qsimd.cpp
+++ b/src/corelib/tools/qsimd.cpp
@@ -244,7 +244,7 @@ static void xgetbv(int in, uint &eax, uint &edx)
     eax = result;
     edx = result >> 32;
 #elif defined(Q_CC_GNU)
-    asm ("xgetbv"
+    asm (".byte 0x0F, 0x01, 0xD0" // xgetbv instruction
         : "=a" (eax), "=d" (edx)
         : "c" (in));
 #endif