[PATCH] D145908: [X86] Remove unreachable code in X86TargetTransformInfo.cpp
Wang, Xin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Mar 13 02:23:39 PDT 2023
XinWang10 created this revision.
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In Function getVectorInstrCost, situation Opcode == Instruction::ExtractElement
and Opcode == Instruction::InsertElement are all handled in the first 2 if-statements,
So we have no chance for the code in line 4401.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D145908
Files:
llvm/lib/Target/X86/X86TargetTransformInfo.cpp
Index: llvm/lib/Target/X86/X86TargetTransformInfo.cpp
===================================================================
--- llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -4396,11 +4396,6 @@
return ShuffleCost + IntOrFpCost + RegisterFileMoveCost;
}
- // Add to the base cost if we know that the extracted element of a vector is
- // destined to be moved to and used in the integer register file.
- if (Opcode == Instruction::ExtractElement && ScalarType->isPointerTy())
- RegisterFileMoveCost += 1;
-
return BaseT::getVectorInstrCost(Opcode, Val, CostKind, Index, Op0, Op1) +
RegisterFileMoveCost;
}
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