c1a269bf0e
If a loop has a sufficiently large amount of compute instruction in its loop body, it is unlikely that our rewrite of the loop iterators introduces large performance changes. As Polly can also apply beneficical optimizations (such as parallelization) to such loop nests, we mark them as profitable. This option is currently "disabled" by default, but can be used to run experiments. If enabled by setting it e.g. to 40 instructions, we currently see some compile-time increases on LNT without any significant run-time changes. llvm-svn: 256199
84 lines
2.7 KiB
LLVM
84 lines
2.7 KiB
LLVM
; RUN: opt %loadPolly -polly-process-unprofitable=false \
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; RUN: -polly-detect-profitability-min-per-loop-insts=40 \
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; RUN: -polly-detect -analyze < %s | FileCheck %s -check-prefix=PROFITABLE
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; RUN: opt %loadPolly -polly-process-unprofitable=true \
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; RUN: -polly-detect -analyze < %s | FileCheck %s -check-prefix=PROFITABLE
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; RUN: opt %loadPolly -polly-process-unprofitable=false \
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; RUN: \
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; RUN: -polly-detect -analyze < %s | FileCheck %s -check-prefix=UNPROFITABLE
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; UNPROFITABLE-NOT: Valid Region for Scop:
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; PROFITABLE: Valid Region for Scop:
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; void foo(float *A, float *B, long N) {
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; for (long i = 0; i < 100; i++)
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; A[i] += .... / * a lot of compute */
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; }
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @foo(float* %A, float* %B, i64 %N) {
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entry:
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br label %header
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header:
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%i.0 = phi i64 [ 0, %entry ], [ %tmp10, %header ]
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%tmp5 = sitofp i64 %i.0 to float
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%tmp6 = getelementptr inbounds float, float* %A, i64 %i.0
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%tmp7 = load float, float* %tmp6, align 4
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%tmp8 = fadd float %tmp7, %tmp5
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%val0 = fadd float %tmp7, 1.0
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%val1 = fadd float %val0, 1.0
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%val2 = fadd float %val1, 1.0
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%val3 = fadd float %val2, 1.0
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%val4 = fadd float %val3, 1.0
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%val5 = fadd float %val4, 1.0
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%val6 = fadd float %val5, 1.0
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%val7 = fadd float %val6, 1.0
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%val8 = fadd float %val7, 1.0
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%val9 = fadd float %val8, 1.0
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%val10 = fadd float %val9, 1.0
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%val11 = fadd float %val10, 1.0
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%val12 = fadd float %val11, 1.0
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%val13 = fadd float %val12, 1.0
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%val14 = fadd float %val13, 1.0
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%val15 = fadd float %val14, 1.0
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%val16 = fadd float %val15, 1.0
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%val17 = fadd float %val16, 1.0
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%val18 = fadd float %val17, 1.0
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%val19 = fadd float %val18, 1.0
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%val20 = fadd float %val19, 1.0
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%val21 = fadd float %val20, 1.0
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%val22 = fadd float %val21, 1.0
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%val23 = fadd float %val22, 1.0
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%val24 = fadd float %val23, 1.0
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%val25 = fadd float %val24, 1.0
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%val26 = fadd float %val25, 1.0
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%val27 = fadd float %val26, 1.0
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%val28 = fadd float %val27, 1.0
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%val29 = fadd float %val28, 1.0
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%val30 = fadd float %val29, 1.0
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%val31 = fadd float %val30, 1.0
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%val32 = fadd float %val31, 1.0
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%val33 = fadd float %val32, 1.0
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%val34 = fadd float %val33, 1.0
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%val35 = fadd float %val34, 1.0
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%val36 = fadd float %val35, 1.0
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%val37 = fadd float %val36, 1.0
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%val38 = fadd float %val37, 1.0
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%val39 = fadd float %val38, 1.0
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%val40 = fadd float %val39, 1.0
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%val41 = fadd float %val40, 1.0
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%val42 = fadd float %val41, 1.0
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%val43 = fadd float %val42, 1.0
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store float %val34, float* %tmp6, align 4
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%exitcond = icmp ne i64 %i.0, 100
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%tmp10 = add nsw i64 %i.0, 1
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br i1 %exitcond, label %header, label %exit
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exit:
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ret void
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}
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