[llvm] r200279 - x86: add implicit defs for cpuid

[Reid Kleckner]

Author: rnk
Date: Mon Jan 27 20:08:22 2014
New Revision: 200279

URL: http://llvm.org/viewvc/llvm-project?rev=200279&view=rev
Log:
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.

Modified:
    llvm/trunk/lib/Target/X86/X86InstrSystem.td

Modified: llvm/trunk/lib/Target/X86/X86InstrSystem.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrSystem.td?rev=200279&r1=200278&r2=200279&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrSystem.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrSystem.td Mon Jan 27 20:08:22 2014
@@ -455,8 +455,13 @@ def LMSW16r : I<0x01, MRM6r, (outs), (in
                 "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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