[all-commits] [llvm/llvm-project] 11455a: [CodeGen] Allow partial tail duplication in Machin...
Hongtao Yu via All-commits
all-commits at lists.llvm.org
Sat Apr 11 12:21:06 PDT 2020
Branch: refs/heads/master
Home: https://github.com/llvm/llvm-project
Commit: 11455a7905947f61533a689e5f8ef45d5d1f26ff
https://github.com/llvm/llvm-project/commit/11455a7905947f61533a689e5f8ef45d5d1f26ff
Author: Hongtao Yu <hoy at fb.com>
Date: 2020-04-11 (Sat, 11 Apr 2020)
Changed paths:
M llvm/lib/CodeGen/MachineBlockPlacement.cpp
A llvm/test/CodeGen/X86/tail-dup-partial.ll
Log Message:
-----------
[CodeGen] Allow partial tail duplication in Machine Block Placement.
Summary: A count profile may affect tail duplication's heuristic causing a block to be duplicated in only a part of its predecessors. This is not allowed in the Machine Block Placement pass where an assert will go off. I'm removing the assert and making the optimization bail out when such case happens.
Reviewers: wenlei, davidxl, Carrot
Reviewed By: Carrot
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D77748
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