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081e6fcd17
For the purpose of calculating the cost of the loop at various vectorization factors, we need to count dependencies of consecutive pointers as uniforms (which means that the VF = 1 cost is used for all overall VF values). For example, the TSVC benchmark function s173 has: ... %3 = add nsw i64 %indvars.iv, 16000 %arrayidx8 = getelementptr inbounds %struct.GlobalData* @global_data, i64 0, i32 0, i64 %3 ... and we must realize that the add will be a scalar in order to correctly deduce it to be profitable to vectorize this on PowerPC with VSX enabled. In fact, all dependencies of a consecutive pointer must be a scalar (uniform), and so we simply need to add all consecutive pointers to the worklist that currently detects collects uniforms. Fixes PR19296. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205387 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
2.2 KiB
LLVM
52 lines
2.2 KiB
LLVM
; RUN: opt < %s -mcpu=pwr7 -mattr=+vsx -loop-vectorize -instcombine -S | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.GlobalData = type { [32000 x float], [3 x i32], [4 x i8], [32000 x float], [5 x i32], [12 x i8], [32000 x float], [7 x i32], [4 x i8], [32000 x float], [11 x i32], [4 x i8], [32000 x float], [13 x i32], [12 x i8], [256 x [256 x float]], [17 x i32], [12 x i8], [256 x [256 x float]], [19 x i32], [4 x i8], [256 x [256 x float]], [23 x i32], [4 x i8], [256 x [256 x float]] }
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@global_data = external global %struct.GlobalData, align 16
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@ntimes = external hidden unnamed_addr global i32, align 4
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define signext i32 @s173() #0 {
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entry:
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%0 = load i32* @ntimes, align 4
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%cmp21 = icmp sgt i32 %0, 0
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br i1 %cmp21, label %for.cond1.preheader, label %for.end12
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for.cond1.preheader: ; preds = %for.end, %entry
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%nl.022 = phi i32 [ %inc11, %for.end ], [ 0, %entry ]
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br label %for.body3
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for.body3: ; preds = %for.body3, %for.cond1.preheader
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%indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body3 ]
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%arrayidx = getelementptr inbounds %struct.GlobalData* @global_data, i64 0, i32 0, i64 %indvars.iv
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%1 = load float* %arrayidx, align 4
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%arrayidx5 = getelementptr inbounds %struct.GlobalData* @global_data, i64 0, i32 3, i64 %indvars.iv
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%2 = load float* %arrayidx5, align 4
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%add = fadd float %1, %2
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%3 = add nsw i64 %indvars.iv, 16000
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%arrayidx8 = getelementptr inbounds %struct.GlobalData* @global_data, i64 0, i32 0, i64 %3
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store float %add, float* %arrayidx8, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 16000
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br i1 %exitcond, label %for.end, label %for.body3
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for.end: ; preds = %for.body3
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%inc11 = add nsw i32 %nl.022, 1
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%4 = load i32* @ntimes, align 4
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%mul = mul nsw i32 %4, 10
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%cmp = icmp slt i32 %inc11, %mul
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br i1 %cmp, label %for.cond1.preheader, label %for.end12
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for.end12: ; preds = %for.end, %entry
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ret i32 0
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; CHECK-LABEL: @s173
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; CHECK: load <4 x float>*
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; CHECK: add i64 %index, 16000
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; CHECK: ret i32 0
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}
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attributes #0 = { nounwind }
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