[PATCH] D57239: [TTI] Add generic SADDSAT/SSUBSAT costs

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: nikic, spatel.

Add generic costs calculation for SADDSAT/SSUBSAT intrinsics, this uses generic costs for sadd_with_overflow/ssub_with_overflow, an extra sign comparison + a selects based on the sign/overflow.

This completes PR40316


Repository:
  rL LLVM

https://reviews.llvm.org/D57239

Files:
  include/llvm/CodeGen/BasicTTIImpl.h
  test/Analysis/CostModel/X86/arith-ssat.ll
  test/Transforms/SLPVectorizer/X86/arith-add-ssat.ll
  test/Transforms/SLPVectorizer/X86/arith-sub-ssat.ll

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