From: Reid Kleckner <reid@kleckner.net>
Date: Tue, 28 Jan 2014 02:08:22 +0000 (+0000)
Subject: x86: add implicit defs for cpuid
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1386d3f8855903aea2dc3e0eb43c53a80cd37382;p=oota-llvm.git

x86: add implicit defs for cpuid

This avoids miscompiling MS inline asm in LLVM where we have to infer
clobbers.  Test case forthcoming in Clang.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200279 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86InstrSystem.td b/lib/Target/X86/X86InstrSystem.td
index e1b008e7fad..abed426bce7 100644
--- a/lib/Target/X86/X86InstrSystem.td
+++ b/lib/Target/X86/X86InstrSystem.td
@@ -455,8 +455,13 @@ def LMSW16r : I<0x01, MRM6r, (outs), (ins GR16:$src),
                 "lmsw{w}\t$src", [], IIC_LMSW_MEM>, TB;
 def LMSW16m : I<0x01, MRM6m, (outs), (ins i16mem:$src),
                 "lmsw{w}\t$src", [], IIC_LMSW_REG>, TB;
-                
-def CPUID : I<0xA2, RawFrm, (outs), (ins), "cpuid", [], IIC_CPUID>, TB;
+
+let Defs = [EAX, EBX, ECX, EDX], Uses = [EAX, ECX] in
+  def CPUID32 : I<0xA2, RawFrm, (outs), (ins), "cpuid", [], IIC_CPUID>, TB,
+  Requires<[Not64BitMode]>;
+let Defs = [RAX, RBX, RCX, RDX], Uses = [RAX, RCX] in
+  def CPUID64 : I<0xA2, RawFrm, (outs), (ins), "cpuid", [], IIC_CPUID>, TB,
+  Requires<[In64BitMode]>;
 } // SchedRW
 
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