llvm-project

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Sanjay Patel 3343fcef86 [InstCombine] allow multi-use values in canEvaluate* if all uses are in 1 inst

This is the enhancement suggested in D42536 to fix a shortcoming in 
regular InstCombine's canEvaluate* functionality.
When we have multiple uses of a value, but they're all in one instruction, we can 
allow that expression to be narrowed or widened for the same cost as a single-use 
value.

AFAICT, this can only matter for multiply: sub/and/or/xor/select would be simplified 
away if the operands are the same value; add becomes shl; shifts with a variable shift 
amount aren't handled.

Differential Revision: https://reviews.llvm.org/D42739

llvm-svn: 324014

2018-02-01 21:55:53 +00:00

CMakeLists.txt

[CMake] NFC. Updating CMake dependency specifications

2016-11-17 04:36:50 +00:00

InstCombineAddSub.cpp

[InstCombine] canonicalize constant-minus-boolean to select-of-constants

2017-12-06 21:22:57 +00:00

InstCombineAndOrXor.cpp

[InstCombine] narrow masked zexted binops (PR35792)

2018-01-25 16:34:36 +00:00

InstCombineCalls.cpp

AMDGPU: Add intrinsics llvm.amdgcn.cvt.{pknorm.i16, pknorm.u16, pk.i16, pk.u16}