Files
llvm/test/CodeGen/PowerPC
Guozhi Wei 77558aa8f9 [MBP] Disable aggressive loop rotate in plain mode
Patch https://reviews.llvm.org/D43256 introduced more aggressive loop layout optimization which depends on profile information. If profile information is not available, the statically estimated profile information(generated by BranchProbabilityInfo.cpp) is used. If user program doesn't behave as BranchProbabilityInfo.cpp expected, the layout may be worse.

To be conservative this patch restores the original layout algorithm in plain mode. But user can still try the aggressive layout optimization with -force-precise-rotation-cost=true.

Differential Revision: https://reviews.llvm.org/D65673



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368339 91177308-0d34-0410-b5e6-96231b3b80d8
2019-08-08 20:25:23 +00:00
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