[llvm] r268578 - [LoopDataPrefetch] Add optimization remark
Adam Nemet via llvm-commits
llvm-commits at lists.llvm.org
Wed May 4 17:08:16 PDT 2016
Author: anemet
Date: Wed May 4 19:08:15 2016
New Revision: 268578
URL: http://llvm.org/viewvc/llvm-project?rev=268578&view=rev
Log:
[LoopDataPrefetch] Add optimization remark
With -Rpass=loop-data-prefetch, show the memory access that got
prefetched.
Added:
llvm/trunk/test/Transforms/LoopDataPrefetch/AArch64/opt-remark.ll
Modified:
llvm/trunk/lib/Transforms/Scalar/LoopDataPrefetch.cpp
Modified: llvm/trunk/lib/Transforms/Scalar/LoopDataPrefetch.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopDataPrefetch.cpp?rev=268578&r1=268577&r2=268578&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopDataPrefetch.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopDataPrefetch.cpp Wed May 4 19:08:15 2016
@@ -26,6 +26,7 @@
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/CFG.h"
+#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IntrinsicInst.h"
@@ -209,9 +210,10 @@ bool LoopDataPrefetch::runOnLoop(Loop *L
if (ItersAhead > getMaxPrefetchIterationsAhead())
return MadeChange;
+ Function *F = L->getHeader()->getParent();
DEBUG(dbgs() << "Prefetching " << ItersAhead
<< " iterations ahead (loop size: " << LoopSize << ") in "
- << L->getHeader()->getParent()->getName() << ": " << *L);
+ << F->getName() << ": " << *L);
SmallVector<std::pair<Instruction *, const SCEVAddRecExpr *>, 16> PrefLoads;
for (Loop::block_iterator I = L->block_begin(), IE = L->block_end();
@@ -291,6 +293,9 @@ bool LoopDataPrefetch::runOnLoop(Loop *L
++NumPrefetches;
DEBUG(dbgs() << " Access: " << *PtrValue << ", SCEV: " << *LSCEV
<< "\n");
+ emitOptimizationRemark(F->getContext(), DEBUG_TYPE, *F,
+ MemI->getDebugLoc(), "prefetched memory access");
+
MadeChange = true;
}
Added: llvm/trunk/test/Transforms/LoopDataPrefetch/AArch64/opt-remark.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopDataPrefetch/AArch64/opt-remark.ll?rev=268578&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopDataPrefetch/AArch64/opt-remark.ll (added)
+++ llvm/trunk/test/Transforms/LoopDataPrefetch/AArch64/opt-remark.ll Wed May 4 19:08:15 2016
@@ -0,0 +1,78 @@
+; RUN: opt -mcpu=cyclone -mtriple=arm64-apple-ios -loop-data-prefetch \
+; RUN: -pass-remarks=loop-data-prefetch -S -max-prefetch-iters-ahead=100 \
+; RUN: < %s 2>&1 | FileCheck %s
+
+; ModuleID = '/tmp/s.c'
+source_filename = "/tmp/s.c"
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+target triple = "arm64-apple-ios5.0.0"
+
+; 1 struct MyStruct {
+; 2 int field;
+; 3 char kk[2044];
+; 4 } *my_struct;
+; 5
+; 6 int f(struct MyStruct *p, int N) {
+; 7 int total = 0;
+; 8 for (int i = 0; i < N; i++) {
+; 9 total += my_struct[i].field;
+; 10 }
+; 11 return total;
+; 12 }
+
+; CHECK: remark: /tmp/s.c:9:27: prefetched memory access
+
+%struct.MyStruct = type { i32, [2044 x i8] }
+
+ at my_struct = common global %struct.MyStruct* null, align 8
+
+define i32 @f(%struct.MyStruct* nocapture readnone %p, i32 %N) !dbg !6 {
+entry:
+ %cmp6 = icmp sgt i32 %N, 0, !dbg !8
+ br i1 %cmp6, label %for.body.lr.ph, label %for.cond.cleanup, !dbg !9
+
+for.body.lr.ph: ; preds = %entry
+ %0 = load %struct.MyStruct*, %struct.MyStruct** @my_struct, align 8, !dbg !10, !tbaa !11
+ br label %for.body, !dbg !9
+
+for.cond.cleanup: ; preds = %for.body, %entry
+ %total.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
+ ret i32 %total.0.lcssa, !dbg !15
+
+for.body: ; preds = %for.body, %for.body.lr.ph
+ %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
+ %total.07 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
+ %field = getelementptr inbounds %struct.MyStruct, %struct.MyStruct* %0, i64 %indvars.iv, i32 0, !dbg !16
+ %1 = load i32, i32* %field, align 4, !dbg !16, !tbaa !17
+ %add = add nsw i32 %1, %total.07, !dbg !20
+ %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !9
+ %lftr.wideiv = trunc i64 %indvars.iv.next to i32, !dbg !9
+ %exitcond = icmp eq i32 %lftr.wideiv, %N, !dbg !9
+ br i1 %exitcond, label %for.cond.cleanup, label %for.body, !dbg !9
+}
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+!llvm.ident = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
+!1 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = !{i32 1, !"PIC Level", i32 2}
+!5 = !{!"clang version 3.9.0"}
+!6 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 6, type: !7, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
+!7 = !DISubroutineType(types: !2)
+!8 = !DILocation(line: 8, column: 21, scope: !6)
+!9 = !DILocation(line: 8, column: 3, scope: !6)
+!10 = !DILocation(line: 9, column: 14, scope: !6)
+!11 = !{!12, !12, i64 0}
+!12 = !{!"any pointer", !13, i64 0}
+!13 = !{!"omnipotent char", !14, i64 0}
+!14 = !{!"Simple C/C++ TBAA"}
+!15 = !DILocation(line: 11, column: 3, scope: !6)
+!16 = !DILocation(line: 9, column: 27, scope: !6)
+!17 = !{!18, !19, i64 0}
+!18 = !{!"MyStruct", !19, i64 0, !13, i64 4}
+!19 = !{!"int", !13, i64 0}
+!20 = !DILocation(line: 9, column: 11, scope: !6)
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