[PATCH] D90431: [x86] add cost overrides for mul with overflow

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: RKSimon, craig.topper, pengfei.
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I'm assuming the standard size integer instructions for this end up as something like:
	mulq	%rsi
	seto	%al

And the 'mul' generally has reciprocal throughput of 1 on typical implementations (higher latency, but that's not handled here).
The default costs may end up much higher than that, and that's what we see in the test diffs.


https://reviews.llvm.org/D90431

Files:
  llvm/lib/Target/X86/X86TargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/X86/arith-overflow.ll
  llvm/test/Analysis/CostModel/X86/intrinsic-cost-kinds.ll

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