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
61 lines
2.3 KiB
LLVM
61 lines
2.3 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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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
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define void @mainTest(ptr %ptr) #0 {
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; CHECK-LABEL: @mainTest(
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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: [[DUMMY_PHI:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[OP_RDX3:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 1
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; CHECK-NEXT: [[TMP1:%.*]] = load <4 x i32>, ptr [[PTR]], align 4
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; CHECK-NEXT: [[TMP2:%.*]] = extractelement <4 x i32> [[TMP1]], i32 3
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; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i32> [[TMP1]], i32 2
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; CHECK-NEXT: [[TMP4:%.*]] = load i32, ptr [[TMP0]], align 4
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; CHECK-NEXT: [[TMP5:%.*]] = mul <4 x i32> [[TMP1]], [[TMP1]]
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; CHECK-NEXT: [[TMP6:%.*]] = sext i32 [[TMP3]] to i64
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; CHECK-NEXT: [[TMP7:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[TMP5]])
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; CHECK-NEXT: [[OP_RDX:%.*]] = add i32 [[TMP7]], [[TMP4]]
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; CHECK-NEXT: [[OP_RDX1:%.*]] = add i32 [[TMP3]], [[TMP2]]
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; CHECK-NEXT: [[OP_RDX2:%.*]] = add i32 [[OP_RDX]], [[OP_RDX1]]
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; CHECK-NEXT: [[OP_RDX3]] = add i32 [[OP_RDX2]], 1
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: bail_out:
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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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%dummy_phi = phi i32 [ 1, %entry ], [ %18, %loop ]
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%0 = load i32, ptr %ptr , align 4
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%1 = mul i32 %0, %0
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%2 = add i32 1, %1
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%3 = getelementptr inbounds i32, ptr %ptr, i64 1
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%4 = load i32, ptr %3 , align 4
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%5 = mul i32 %4, %4
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%6 = add i32 %2, %4
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%7 = add i32 %6, %5
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%8 = getelementptr inbounds i32, ptr %ptr, i64 2
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%9 = load i32, ptr %8 , align 4
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%10 = mul i32 %9, %9
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%11 = add i32 %7, %9
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%12 = add i32 %11, %10
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%13 = sext i32 %9 to i64
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%14 = getelementptr inbounds i32, ptr %ptr, i64 3
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%15 = load i32, ptr %14 , align 4
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%16 = mul i32 %15, %15
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%17 = add i32 %12, %15
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%18 = add i32 %17, %16
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br label %loop
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bail_out:
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ret void
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}
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attributes #0 = { "target-cpu"="westmere" }
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