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
58 lines
2.0 KiB
LLVM
58 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=slp-vectorizer -slp-vectorize-hor -slp-vectorize-hor-store -S < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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define void @test(ptr %ptr, ptr noalias %s) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq ptr [[PTR:%.*]], null
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; CHECK-NEXT: br i1 [[CMP]], label [[LOOP:%.*]], label [[BAIL_OUT:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[TMP0:%.*]] = load <4 x i32>, ptr [[PTR]], align 4
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; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr [[PTR]], align 4
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; CHECK-NEXT: store <4 x i32> [[TMP0]], ptr [[S:%.*]], align 4
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; CHECK-NEXT: br label [[LOOP1:%.*]]
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; CHECK: loop1:
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; CHECK-NEXT: store i32 [[TMP1]], ptr [[S]], align 4
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; CHECK-NEXT: br i1 true, label [[LOOP1]], label [[CONT:%.*]]
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; CHECK: cont:
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; CHECK-NEXT: br i1 true, label [[LOOP]], label [[BAIL_OUT]]
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; CHECK: bail_out:
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; CHECK-NEXT: [[DUMMY_PHI:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[TMP1]], [[CONT]] ]
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; CHECK-NEXT: store i32 [[DUMMY_PHI]], ptr [[S]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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%cmp = icmp eq ptr %ptr, null
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br i1 %cmp, label %loop, label %bail_out
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loop:
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%0 = load i32, ptr %ptr , align 4
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%1 = getelementptr inbounds i32, ptr %ptr, i64 1
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%2 = load i32, ptr %1 , align 4
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%3 = getelementptr inbounds i32, ptr %ptr, i64 2
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%4 = load i32, ptr %3 , align 4
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%5 = getelementptr inbounds i32, ptr %ptr, i64 3
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%6 = load i32, ptr %5 , align 4
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store i32 %0, ptr %s, align 4
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%7 = getelementptr inbounds i32, ptr %s, i64 1
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store i32 %2, ptr %7, align 4
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%8 = getelementptr inbounds i32, ptr %s, i64 2
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store i32 %4, ptr %8, align 4
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%9 = getelementptr inbounds i32, ptr %s, i64 3
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store i32 %6, ptr %9, align 4
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br label %loop1
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loop1:
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store i32 %0, ptr %s, align 4
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br i1 true, label %loop1, label %cont
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cont:
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br i1 true, label %loop, label %bail_out
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bail_out:
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%dummy_phi = phi i32 [ 1, %entry ], [ %0, %cont ]
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store i32 %dummy_phi, ptr %s, align 4
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ret void
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}
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