[PATCH] [x86] Do not convert to cmp32 for Atom arch.

[Sergey Okunev]

Hi grosbach,

Added 'Atom' check in 'X86TargetLowering::EmitCmp' func.

http://llvm-reviews.chandlerc.com/D2824

Files:
  lib/Target/X86/X86ISelLowering.cpp

Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -9774,12 +9774,14 @@
  
   if ((Op0.getValueType() == MVT::i8 || Op0.getValueType() == MVT::i16 ||
        Op0.getValueType() == MVT::i32 || Op0.getValueType() == MVT::i64)) {
-    // Do the comparison at i32 if it's smaller. This avoids subregister
-    // aliasing issues. Keep the smaller reference if we're optimizing for
-    // size, however, as that'll allow better folding of memory operations.
+    // Do the comparison at i32 if it's smaller, besides the Atom case. 
+    // This avoids subregister aliasing issues. Keep the smaller reference 
+    // if we're optimizing for size, however, as that'll allow better folding 
+    // of memory operations.
     if (Op0.getValueType() != MVT::i32 && Op0.getValueType() != MVT::i64 &&
         !DAG.getMachineFunction().getFunction()->getAttributes().hasAttribute(
-             AttributeSet::FunctionIndex, Attribute::MinSize)) {
+             AttributeSet::FunctionIndex, Attribute::MinSize) &&
+        !Subtarget->isAtom()) {
       unsigned ExtendOp =
           isX86CCUnsigned(X86CC) ? ISD::ZERO_EXTEND : ISD::SIGN_EXTEND;
       Op0 = DAG.getNode(ExtendOp, dl, MVT::i32, Op0);
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