[PATCH] D64195: [PowerPC] Replace float load/store pair with integer load/store pair when it's only used in load/store

[Zixuan Wu via Phabricator via llvm-commits]

wuzish created this revision.
wuzish added reviewers: hfinkel, nemanjai, jsji, eli.friedman.
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Replace float load/store pair with integer load/store pair when it's only used in load/store, because float load/store instructions cost more cycles then integer load/store.

A typical scenario is when there is a call with more than 13 float arguments passing, we need pass them by stack. So we need a load/store pair to do such memory operation if the variable is global variable.


Repository:
  rL LLVM

https://reviews.llvm.org/D64195

Files:
  lib/Target/PowerPC/PPCISelLowering.h
  test/CodeGen/PowerPC/float-load-store-pair.ll
  test/CodeGen/PowerPC/ppc64-smallarg.ll
  test/CodeGen/PowerPC/ppc64le-smallarg.ll
  test/CodeGen/PowerPC/pwr7-gt-nop.ll

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