[PATCH] [X86][FastIsel] Teach how to select scalar integer to float/double conversions.

[Juergen Ributzka]

================
Comment at: lib/Target/X86/X86FastISel.cpp:2046
@@ +2045,3 @@
+    MIB.addReg(ImplicitDefReg, RegState::Kill);
+  MIB.addReg(OpReg);
+  updateValueMap(I, ResultReg);
----------------
You may want to constrain the register class with "constrainOperandRegClass".

http://reviews.llvm.org/D7698

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