Add option to force filetype=asm for testing

src/IceTargetLoweringX86BaseImpl.h

Index: src/IceTargetLoweringX86BaseImpl.h
diff --git a/src/IceTargetLoweringX86BaseImpl.h b/src/IceTargetLoweringX86BaseImpl.h
index d251e6a2756c66ed28d189e7e588ac38c7ed0771..5af7a7d65f7497f4a10c46399f6c09e6b315bc68 100644
--- a/src/IceTargetLoweringX86BaseImpl.h
+++ b/src/IceTargetLoweringX86BaseImpl.h
@@ -5748,7 +5748,12 @@ Variable *TargetX86Base<Machine>::makeVectorOfMinusOnes(Type Ty,
   Variable *MinusOnes = makeReg(Ty, RegNum);
   // Insert a FakeDef so the live range of MinusOnes is not overestimated.
   Context.insert<InstFakeDef>(MinusOnes);
-  _pcmpeq(MinusOnes, MinusOnes);
+  if (Ty == IceType_f64)
+    // pcmpeqq requires SSE 4.1, while pcmpeqd does the same job and only

[Jim Stichnoth, 2015/12/20 18:42:23]

Could you also note that f64 is (currently) used only for fabs intrinsic
lowering?  Otherwise I was having a hard time figuring out how this code path
was taken.

[sehr, 2016/01/07 18:53:12]

Done.

+    // requires SSE2.
+    _pcmpeq(MinusOnes, MinusOnes, IceType_f32);
+  else
+    _pcmpeq(MinusOnes, MinusOnes);
   return MinusOnes;
 }