[PATCH] [X86] tranform insertps to blendps when possible for better performance

[Sanjay Patel]

I wrote a test program that executes 100 of each inst type to confirm that we do achieve double the throughput on SandyBridge using blendps:
blendps : 5406907580 cycles for 150000000 iterations (36.05 cycles/iter).
insertps: 10869956010 cycles for 150000000 iterations (72.47 cycles/iter).

I also found that on AMD Jaguar (btver2), blendps has half the latency of insertps, so it's an even bigger win there.


http://reviews.llvm.org/D7866

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