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99b03e3401
Otherwise we use the same threshold as for complete unrolling, which is way too high. This made us unroll any loop smaller than 150 instructions by 8 times, but only if someone specified -march=core2 or better, which happens to be the default on darwin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207940 91177308-0d34-0410-b5e6-96231b3b80d8
128 lines
4.7 KiB
LLVM
128 lines
4.7 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -mcpu=nehalem -x86-use-partial-unrolling=1 | FileCheck %s
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; RUN: opt < %s -S -loop-unroll -mcpu=core -x86-use-partial-unrolling=1 | FileCheck -check-prefix=CHECK-NOUNRL %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @foo(i32* noalias nocapture readnone %ip, double %alpha, double* noalias nocapture %a, double* noalias nocapture readonly %b) #0 {
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entry:
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br label %vector.body
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vector.body: ; preds = %vector.body, %entry
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%index = phi i64 [ 0, %entry ], [ %index.next, %vector.body ]
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%0 = getelementptr inbounds double* %b, i64 %index
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%1 = bitcast double* %0 to <2 x double>*
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%wide.load = load <2 x double>* %1, align 8
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%.sum9 = or i64 %index, 2
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%2 = getelementptr double* %b, i64 %.sum9
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%3 = bitcast double* %2 to <2 x double>*
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%wide.load8 = load <2 x double>* %3, align 8
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%4 = fadd <2 x double> %wide.load, <double 1.000000e+00, double 1.000000e+00>
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%5 = fadd <2 x double> %wide.load8, <double 1.000000e+00, double 1.000000e+00>
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%6 = getelementptr inbounds double* %a, i64 %index
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%7 = bitcast double* %6 to <2 x double>*
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store <2 x double> %4, <2 x double>* %7, align 8
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%.sum10 = or i64 %index, 2
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%8 = getelementptr double* %a, i64 %.sum10
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%9 = bitcast double* %8 to <2 x double>*
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store <2 x double> %5, <2 x double>* %9, align 8
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%index.next = add i64 %index, 4
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%10 = icmp eq i64 %index.next, 1600
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br i1 %10, label %for.end, label %vector.body
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; FIXME: We should probably unroll this loop by a factor of 2, but the cost
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; model needs to be fixed to account for instructions likely to be folded
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; as part of an addressing mode.
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; CHECK-LABEL: @foo
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; CHECK-NOUNRL-LABEL: @foo
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for.end: ; preds = %vector.body
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ret void
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}
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define void @bar(i32* noalias nocapture readnone %ip, double %alpha, double* noalias nocapture %a, double* noalias nocapture readonly %b) #0 {
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entry:
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br label %vector.body
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vector.body: ; preds = %vector.body, %entry
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%index = phi i64 [ 0, %entry ], [ %index.next, %vector.body ]
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%v0 = getelementptr inbounds double* %b, i64 %index
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%v1 = bitcast double* %v0 to <2 x double>*
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%wide.load = load <2 x double>* %v1, align 8
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%v4 = fadd <2 x double> %wide.load, <double 1.000000e+00, double 1.000000e+00>
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%v5 = fmul <2 x double> %v4, <double 8.000000e+00, double 8.000000e+00>
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%v6 = getelementptr inbounds double* %a, i64 %index
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%v7 = bitcast double* %v6 to <2 x double>*
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store <2 x double> %v5, <2 x double>* %v7, align 8
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%index.next = add i64 %index, 2
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%v10 = icmp eq i64 %index.next, 1600
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br i1 %v10, label %for.end, label %vector.body
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; FIXME: We should probably unroll this loop by a factor of 2, but the cost
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; model needs to first to fixed to account for instructions likely to be folded
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; as part of an addressing mode.
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; CHECK-LABEL: @bar
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; CHECK: fadd
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; CHECK-NEXT: fmul
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; CHECK: fadd
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; CHECK-NEXT: fmul
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; CHECK-NOUNRL-LABEL: @bar
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; CHECK-NOUNRL: fadd
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; CHECK-NOUNRL-NEXT: fmul
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; CHECK-NOUNRL-NOT: fadd
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for.end: ; preds = %vector.body
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ret void
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}
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define zeroext i16 @test1(i16* nocapture readonly %arr, i32 %n) #0 {
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entry:
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%cmp25 = icmp eq i32 %n, 0
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br i1 %cmp25, label %for.end, label %for.body
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%reduction.026 = phi i16 [ %add14, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i16* %arr, i64 %indvars.iv
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%0 = load i16* %arrayidx, align 2
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%add = add i16 %0, %reduction.026
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%sext = mul i64 %indvars.iv, 12884901888
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%idxprom3 = ashr exact i64 %sext, 32
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%arrayidx4 = getelementptr inbounds i16* %arr, i64 %idxprom3
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%1 = load i16* %arrayidx4, align 2
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%add7 = add i16 %add, %1
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%sext28 = mul i64 %indvars.iv, 21474836480
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%idxprom10 = ashr exact i64 %sext28, 32
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%arrayidx11 = getelementptr inbounds i16* %arr, i64 %idxprom10
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%2 = load i16* %arrayidx11, align 2
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%add14 = add i16 %add7, %2
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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%reduction.0.lcssa = phi i16 [ 0, %entry ], [ %add14, %for.body ]
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ret i16 %reduction.0.lcssa
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; This loop is too large to be partially unrolled (size=16)
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; CHECK-LABEL: @test1
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; CHECK: br
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; CHECK: br
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; CHECK: br
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; CHECK: br
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; CHECK-NOT: br
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; CHECK-NOUNRL-LABEL: @test1
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; CHECK-NOUNRL: br
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; CHECK-NOUNRL: br
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; CHECK-NOUNRL: br
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; CHECK-NOUNRL: br
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; CHECK-NOUNRL-NOT: br
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}
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attributes #0 = { nounwind uwtable }
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