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Author SHA1 Message Date
Zhaoshi Zheng 95710337b4 Revert "Revert "[ConstHoist] Do not rebase single (or few) dependent constant"" 
This reverts commit bd7b44f35ee9fbe365eb25ce55437ea793b39346.

Reland r342994: disabled the optimization and explicitly enable it in test.

-mllvm -consthoist-min-num-to-rebase<unsigned>=0

[ConstHoist] Do not rebase single (or few) dependent constant

If an instance (InsertionPoint or IP) of Base constant A has only one or few
rebased constants depending on it, do NOT rebase. One extra ADD instruction is
required to materialize each rebased constant, assuming A and the rebased have
the same materialization cost.

Differential Revision: https://reviews.llvm.org/D52243

llvm-svn: 343053
 2018-09-26 00:59:09 +00:00
Jessica Paquette e02de05b32 Revert "[ConstHoist] Do not rebase single (or few) dependent constant" 
This caused a couple test failures on a bot:

CodeGen/X86/constant-hoisting-bfi.ll
Transforms/ConstantHoisting/X86/ehpad.ll

Example:

http://green.lab.llvm.org/green/job/clang-stage1-cmake-RA-incremental/53575/

llvm-svn: 343005
 2018-09-25 18:41:40 +00:00
Zhaoshi Zheng 2c1a09188f [ConstHoist] Do not rebase single (or few) dependent constant 
If an instance (InsertionPoint or IP) of Base constant A has only one or few
rebased constants depending on it, do NOT rebase. One extra ADD instruction is
required to materialize each rebased constant, assuming A and the rebased have
the same materialization cost.

Differential Revision: https://reviews.llvm.org/D52243

llvm-svn: 342994
 2018-09-25 17:45:37 +00:00