b10ecfa914
Currently SLP vectorizer tries to keep only GEPs as scalar, if they are vectorized but used externally. Same approach can be used for all scalar values. This patch tries to keep original scalars if all its operands remain scalar or externally used, the cost of the original scalar is lower than the cost of the extractelement instruction, or if the number of externally used scalars in the same entry is power of 2. Last criterion allows better revectorization for multiply used scalars. Reviewers: RKSimon Reviewed By: RKSimon Pull Request: https://github.com/llvm/llvm-project/pull/100904
56 lines
1.5 KiB
LLVM
56 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=slp-vectorizer -mtriple=x86_64-unknown-linux < %s | FileCheck %s
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define void @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br i1 false, label [[PH:%.*]], label [[EXIT:%.*]]
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; CHECK: ph:
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; CHECK-NEXT: [[TMP0:%.*]] = call i8 @llvm.vector.reduce.and.v8i8(<8 x i8> zeroinitializer)
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; CHECK-NEXT: [[OP_RDX:%.*]] = and i8 0, [[TMP0]]
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; CHECK-NEXT: [[OP_RDX1:%.*]] = and i8 [[OP_RDX]], 0
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[PHI:%.*]] = phi i8 [ [[OP_RDX1]], [[PH]] ], [ 0, [[BB:%.*]] ]
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; CHECK-NEXT: ret void
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;
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bb:
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br i1 false, label %ph, label %exit
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ph:
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%add1 = add i8 0, 0
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%add2 = add i8 %add1, 0
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%add3 = add i8 %add1, 0
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%add4 = add i8 %add1, 0
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%add5 = add i8 %add1, 0
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%add6 = add i8 %add1, 0
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%add7 = add i8 %add1, 0
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%add8 = add i8 %add1, 0
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%add9 = add i8 0, 0
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%add10 = add i8 0, %add9
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%0 = and i8 %add10, %add3
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%1 = and i8 %0, %add2
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%2 = and i8 %1, %add4
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%3 = and i8 %2, 0
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%4 = and i8 %3, %add5
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%5 = and i8 %4, %add6
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%6 = and i8 %5, 0
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%7 = and i8 %6, 0
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%8 = and i8 %7, 0
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%9 = and i8 %8, 0
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%10 = and i8 %9, 0
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%11 = and i8 %10, 0
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%12 = and i8 %11, 0
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%13 = and i8 %12, %add7
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%14 = and i8 %13, %add8
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%15 = and i8 %14, 0
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%16 = and i8 %15, 0
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%17 = and i8 %16, 0
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%18 = and i8 %17, 0
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%and = and i8 %18, %add1
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br label %exit
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exit:
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%phi = phi i8 [ %and, %ph ], [ 0, %bb ]
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ret void
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}
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