From 1fb090e593214cd8e7869db07f6e87da31cccda5 Mon Sep 17 00:00:00 2001 From: Haicheng Wu Date: Tue, 21 Jun 2016 22:47:56 +0000 Subject: [PATCH] [Kryo] Enable loop prefetcher. Differential Revision: http://reviews.llvm.org/D21535 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273329 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/AArch64/AArch64Subtarget.cpp | 4 ++ .../LoopDataPrefetch/AArch64/kryo-large-stride.ll | 51 ++++++++++++++++++++++ 2 files changed, 55 insertions(+) create mode 100644 test/Transforms/LoopDataPrefetch/AArch64/kryo-large-stride.ll diff --git a/lib/Target/AArch64/AArch64Subtarget.cpp b/lib/Target/AArch64/AArch64Subtarget.cpp index 5904221e153..20faf8e6d2e 100644 --- a/lib/Target/AArch64/AArch64Subtarget.cpp +++ b/lib/Target/AArch64/AArch64Subtarget.cpp @@ -70,6 +70,10 @@ void AArch64Subtarget::initializeProperties() { case Kryo: MaxInterleaveFactor = 4; VectorInsertExtractBaseCost = 2; + CacheLineSize = 128; + PrefetchDistance = 740; + MinPrefetchStride = 1024; + MaxPrefetchIterationsAhead = 11; break; case Vulcan: break; case CortexA35: break; diff --git a/test/Transforms/LoopDataPrefetch/AArch64/kryo-large-stride.ll b/test/Transforms/LoopDataPrefetch/AArch64/kryo-large-stride.ll new file mode 100644 index 00000000000..6433a82fb18 --- /dev/null +++ b/test/Transforms/LoopDataPrefetch/AArch64/kryo-large-stride.ll @@ -0,0 +1,51 @@ +; RUN: opt -mcpu=kryo -mtriple=aarch64-gnu-linux -loop-data-prefetch -max-prefetch-iters-ahead=1000 -S < %s | FileCheck %s --check-prefix=LARGE_PREFETCH --check-prefix=ALL +; RUN: opt -mcpu=kryo -mtriple=aarch64-gnu-linux -loop-data-prefetch -S < %s | FileCheck %s --check-prefix=NO_LARGE_PREFETCH --check-prefix=ALL + +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" + +; ALL-LABEL: @small_stride( +define void @small_stride(double* nocapture %a, double* nocapture readonly %b) { +entry: + br label %for.body + +; 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 + +; ALL: for.end: +for.end: ; preds = %for.body + ret void +} + +; ALL-LABEL: @large_stride( +define void @large_stride(double* nocapture %a, double* nocapture readonly %b) { +entry: + br label %for.body + +; 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, 150 + %exitcond = icmp eq i64 %indvars.iv.next, 160000 + br i1 %exitcond, label %for.end, label %for.body + +; ALL: for.end: +for.end: ; preds = %for.body + ret void +} -- 2.11.0