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llvm-project/llvm/lib/Transforms/InstCombine
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Sanjay Patel 18db56209c [InstCombine] canonicalize cmp/select form of uadd saturate with constant 
I'm circling back around to a loose end from D51929.

The backend (either CGP or DAG) doesn't recognize this pattern, so we end up with different asm for these IR variants.

Regardless of any future changes to canonicalize to saturation/overflow intrinsics, we want to get raw IR variations 
into the minimal number of raw IR forms. If/when we can canonicalize to intrinsics, that will make that step easier.

  Pre: C2 == ~C1
  %a = add i32 %x, C1
  %c = icmp ugt i32 %x, C2
  %r = select i1 %c, i32 -1, i32 %a
  =>
  %a = add i32 %x, C1
  %c2 = icmp ult i32 %x, C2
  %r = select i1 %c2, i32 %a, i32 -1

  https://rise4fun.com/Alive/pkH

Differential Revision: https://reviews.llvm.org/D57352

llvm-svn: 352536
 		2019-01-29 20:02:45 +00:00
..
CMakeLists.txt InstCombine/AMDGPU: Add dimension-aware image intrinsics to SimplifyDemanded 2018-06-21 13:37:31 +00:00
InstCombineAddSub.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombineAndOrXor.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombineCalls.cpp [X86] Auto upgrade VPCOM/VPCOMU intrinsics to generic integer comparisons 2019-01-20 19:27:40 +00:00
InstCombineCasts.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombineCompares.cpp [InstCombine] Simplify cttz/ctlz + icmp ugt/ult 2019-01-19 09:56:01 +00:00
InstCombineInternal.h [InstCombine] Simplify cttz/ctlz + icmp ugt/ult 2019-01-19 09:56:01 +00:00
InstCombineLoadStoreAlloca.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombineMulDivRem.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombinePHI.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombineSelect.cpp [InstCombine] canonicalize cmp/select form of uadd saturate with constant 2019-01-29 20:02:45 +00:00
InstCombineShifts.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstCombineSimplifyDemanded.cpp Demanded elements support for vector GEPs 2019-01-28 23:24:49 +00:00
InstCombineTables.td InstCombine/AMDGPU: Add dimension-aware image intrinsics to SimplifyDemanded 2018-06-21 13:37:31 +00:00
InstCombineVectorOps.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InstructionCombining.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00