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[LoopDataPrefetch/Aarch64] Allow selective prefetching of large-strid…
…ed accesses Summary: And use this TTI for Cyclone. As it was explained in the original RFC (http://thread.gmane.org/gmane.comp.compilers.llvm.devel/92758), the HW prefetcher work up to 2KB strides. I am also adding tests for this and the previous change (D17943): * Cyclone prefetching accesses with a large stride * Cyclone not prefetching accesses with a small stride * Generic Aarch64 subtarget not prefetching either Reviewers: hfinkel Subscribers: aemerson, rengolin, llvm-commits, mzolotukhin Differential Revision: http://reviews.llvm.org/D17945 llvm-svn: 263771
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llvm/test/Transforms/LoopDataPrefetch/AArch64/large-stride.ll
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; RUN: opt -mcpu=cyclone -mtriple=arm64-apple-ios -loop-data-prefetch -S < %s | FileCheck %s --check-prefix=LARGE_PREFETCH --check-prefix=ALL | ||
; RUN: opt -mcpu=generic -mtriple=arm64-apple-ios -loop-data-prefetch -S < %s | FileCheck %s --check-prefix=NO_LARGE_PREFETCH --check-prefix=ALL | ||
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n32:64-S128" | ||
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; ALL-LABEL: @small_stride( | ||
define void @small_stride(double* nocapture %a, double* nocapture readonly %b) { | ||
entry: | ||
br label %for.body | ||
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; ALL: for.body: | ||
for.body: ; preds = %for.body, %entry | ||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] | ||
%arrayidx = getelementptr inbounds double, double* %b, i64 %indvars.iv | ||
; ALL-NOT: call void @llvm.prefetch | ||
%0 = load double, double* %arrayidx, align 8 | ||
%add = fadd double %0, 1.000000e+00 | ||
%arrayidx2 = getelementptr inbounds double, double* %a, i64 %indvars.iv | ||
store double %add, double* %arrayidx2, align 8 | ||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 | ||
%exitcond = icmp eq i64 %indvars.iv.next, 1600 | ||
br i1 %exitcond, label %for.end, label %for.body | ||
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; ALL: for.end: | ||
for.end: ; preds = %for.body | ||
ret void | ||
} | ||
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; ALL-LABEL: @large_stride( | ||
define void @large_stride(double* nocapture %a, double* nocapture readonly %b) { | ||
entry: | ||
br label %for.body | ||
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; ALL: for.body: | ||
for.body: ; preds = %for.body, %entry | ||
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] | ||
%arrayidx = getelementptr inbounds double, double* %b, i64 %indvars.iv | ||
; LARGE_PREFETCH: call void @llvm.prefetch | ||
; NO_LARGE_PREFETCH-NOT: call void @llvm.prefetch | ||
%0 = load double, double* %arrayidx, align 8 | ||
%add = fadd double %0, 1.000000e+00 | ||
%arrayidx2 = getelementptr inbounds double, double* %a, i64 %indvars.iv | ||
store double %add, double* %arrayidx2, align 8 | ||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 300 | ||
%exitcond = icmp eq i64 %indvars.iv.next, 160000 | ||
br i1 %exitcond, label %for.end, label %for.body | ||
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; ALL: for.end: | ||
for.end: ; preds = %for.body | ||
ret void | ||
} |
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config.suffixes = ['.ll'] | ||
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if not 'AArch64' in config.root.targets: | ||
config.unsupported = True |