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https://github.com/RPCS3/llvm-mirror.git
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6a55f3d913
Current findBestLoopTop can find and move one kind of block to top, a latch block has one successor. Another common case is:
* a latch block
* it has two successors, one is loop header, another is exit
* it has more than one predecessors
If it is below one of its predecessors P, only P can fall through to it, all other predecessors need a jump to it, and another conditional jump to loop header. If it is moved before loop header, all its predecessors jump to it, then fall through to loop header. So all its predecessors except P can reduce one taken branch.
Differential Revision: https://reviews.llvm.org/D43256
llvm-svn: 363471
125 lines
5.6 KiB
LLVM
125 lines
5.6 KiB
LLVM
; RUN: llc %s -o - | FileCheck %s
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; This test case was generated by running
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;
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; clang++ -O2 -g PR37234.cpp -S -save-temps
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; opt -O2 -S PR37234.bc -o PR37234.ll
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;
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; using the following PR37234.cpp program
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;
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; int main() {
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; const char* buffer = "aaa";
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; unsigned aa = 0;
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; while (char c = *buffer++) {
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; if (c == 'a')
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; ++aa; // DexWatch('aa')
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; }
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; return aa;
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; }
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; CHECK-LABEL: # %bb.{{.*}}:
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; CHECK: #DEBUG_VALUE: main:aa <- 0
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; CHECK: #DEBUG_VALUE: main:aa <- $[[REG:[0-9a-z]+]]
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; CHECK: .LBB0_1:
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; CHECK: #DEBUG_VALUE: main:aa <- $[[REG]]
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; CHECK: je .LBB0_4
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; CHECK: # %bb.{{.*}}:
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; CHECK: #DEBUG_VALUE: main:aa <- $[[REG]]
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; CHECK: jne .LBB0_1
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; CHECK: # %bb.{{.*}}:
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; CHECK: #DEBUG_VALUE: main:aa <- $[[REG]]
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; CHECK: incl %[[REG]]
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; CHECK: #DEBUG_VALUE: main:aa <- $[[REG]]
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; CHECK: jmp .LBB0_1
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; CHECK: .LBB0_4:
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; CHECK: #DEBUG_VALUE: main:aa <- $[[REG]]
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; CHECK: retq
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source_filename = "PR37234.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@.str = private unnamed_addr constant [4 x i8] c"aaa\00", align 1
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; Function Attrs: norecurse nounwind readonly uwtable
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define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 0, metadata !16, metadata !DIExpression()), !dbg !19
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br label %while.cond.outer, !dbg !20
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while.cond.outer: ; preds = %if.then, %entry
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%buffer.0.ph = phi i8* [ %incdec.ptr, %if.then ], [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), %entry ]
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%aa.0.ph = phi i32 [ %inc, %if.then ], [ 0, %entry ]
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br label %while.cond, !dbg !21
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while.cond: ; preds = %while.cond.outer, %while.cond
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%buffer.0 = phi i8* [ %incdec.ptr, %while.cond ], [ %buffer.0.ph, %while.cond.outer ], !dbg !22
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call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata i8* %buffer.0, metadata !12, metadata !DIExpression()), !dbg !23
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%incdec.ptr = getelementptr inbounds i8, i8* %buffer.0, i64 1, !dbg !21
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call void @llvm.dbg.value(metadata i8* %incdec.ptr, metadata !12, metadata !DIExpression()), !dbg !23
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%0 = load i8, i8* %buffer.0, align 1, !dbg !24, !tbaa !25
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call void @llvm.dbg.value(metadata i8 %0, metadata !18, metadata !DIExpression()), !dbg !28
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switch i8 %0, label %while.cond [
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i8 0, label %while.end
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i8 97, label %if.then
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], !dbg !20
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if.then: ; preds = %while.cond
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%inc = add i32 %aa.0.ph, 1, !dbg !29
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call void @llvm.dbg.value(metadata i32 %inc, metadata !16, metadata !DIExpression()), !dbg !19
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br label %while.cond.outer, !dbg !29
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while.end: ; preds = %while.cond
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call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.value(metadata i32 %aa.0.ph, metadata !16, metadata !DIExpression()), !dbg !19
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ret i32 %aa.0.ph, !dbg !32
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { norecurse nounwind readonly uwtable }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 7.0.0 (trunk 330946) (llvm/trunk 330952)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "PR37234.cpp", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 7.0.0 (trunk 330946) (llvm/trunk 330952)"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12, !16, !18}
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!12 = !DILocalVariable(name: "buffer", scope: !7, file: !1, line: 2, type: !13)
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
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!14 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !15)
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!15 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!16 = !DILocalVariable(name: "aa", scope: !7, file: !1, line: 3, type: !17)
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!17 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!18 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 4, type: !15)
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!19 = !DILocation(line: 3, column: 18, scope: !7)
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!20 = !DILocation(line: 4, column: 9, scope: !7)
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!21 = !DILocation(line: 4, column: 32, scope: !7)
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!22 = !DILocation(line: 0, scope: !7)
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!23 = !DILocation(line: 2, column: 21, scope: !7)
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!24 = !DILocation(line: 4, column: 25, scope: !7)
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!25 = !{!26, !26, i64 0}
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!26 = !{!"omnipotent char", !27, i64 0}
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!27 = !{!"Simple C++ TBAA"}
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!28 = !DILocation(line: 4, column: 21, scope: !7)
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!29 = !DILocation(line: 6, column: 25, scope: !30)
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!30 = distinct !DILexicalBlock(scope: !31, file: !1, line: 5, column: 21)
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!31 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 36)
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!32 = !DILocation(line: 9, column: 1, scope: !7)
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