e3cf80c5c1
BlockFrequencyInfo calculates block frequencies as Scaled64 numbers but as a last step converts them to unsigned 64bit integers (`BlockFrequency`). This improves the factors picked for this conversion so that: * Avoid big numbers close to UINT64_MAX to avoid users overflowing/saturating when adding multiply frequencies together or when multiplying with integers. This leaves the topmost 10 bits unused to allow for some room. * Spread the difference between hottest/coldest block as much as possible to increase precision. * If the hot/cold spread cannot be represented loose precision at the lower end, but keep the frequencies at the upper end for hot blocks differentiable.
83 lines
3.3 KiB
LLVM
83 lines
3.3 KiB
LLVM
; RUN: opt -mcpu=cyclone -mtriple=arm64-apple-ios -passes=loop-data-prefetch \
|
|
; RUN: -pass-remarks=loop-data-prefetch -S -max-prefetch-iters-ahead=100 \
|
|
; RUN: -pass-remarks-with-hotness \
|
|
; 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 (hotness: 600)
|
|
|
|
%struct.MyStruct = type { i32, [2044 x i8] }
|
|
|
|
@my_struct = common global ptr null, align 8
|
|
|
|
define i32 @f(ptr nocapture readnone %p, i32 %N) !dbg !6 !prof !21 {
|
|
entry:
|
|
%cmp6 = icmp sgt i32 %N, 0, !dbg !8
|
|
br i1 %cmp6, label %for.body.lr.ph, label %for.cond.cleanup, !dbg !9, !prof !22
|
|
|
|
for.body.lr.ph: ; preds = %entry
|
|
%0 = load ptr, ptr @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, ptr %0, i64 %indvars.iv, i32 0, !dbg !16
|
|
%1 = load i32, ptr %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, !prof !23
|
|
}
|
|
|
|
!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, retainedNodes: !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)
|
|
!21 = !{!"function_entry_count", i64 6}
|
|
!22 = !{!"branch_weights", i32 2000, i32 1}
|
|
!23 = !{!"branch_weights", i32 1, i32 99}
|