[PATCH] [x86] eliminate unnecessary shuffling/moves with unary scalar math ops (PR21507)

[Simon Pilgrim]

Thanks Sanjay, in http://reviews.llvm.org/D9095 I added some tests to sse-scalar-fp-arith.ll for llvm.sqrt.f32 / llvm.sqrt.f64 tests - these don't appear to be optimized by this patch - is this something that could be easily added? Feel free to transfer them to sse-scalar-fp-arith-unary.ll.


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Comment at: lib/Target/X86/X86InstrInfo.cpp:529
@@ -528,1 +528,3 @@
     { X86::RCPPSr,          X86::RCPPSm,              TB_ALIGN_16 },
+    { X86::RCPSSr,          X86::RCPSSm    ,          0 },
+    { X86::RCPSSr_Int,      X86::RCPSSm_Int,          0 },
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excess whitespace before the comma

http://reviews.llvm.org/D9504

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