1; RUN: opt -simplifycfg -sink-common-insts -S < %s | FileCheck %s 2 3target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 4target triple = "x86_64-unknown-linux-gnu" 5 6; Simplify CFG will try to sink the last instruction in a series of basic 7; blocks, creating a "common" instruction in the successor block. If the 8; debug locations of the commoned instructions have different file/line 9; numbers the debug location of the common instruction should be a merged 10; location. 11 12; Generated from source: 13 14; extern int foo(void); 15; extern int bar(void); 16; 17; int test(int a, int b) { 18; if(a) 19; b -= foo(); 20; else 21; b -= bar(); 22; return b; 23; } 24 25; CHECK: define i32 @test 26; CHECK-LABEL: if.end: 27; CHECK: %[[PHI:.*]] = phi i32 [ %call1, %if.else ], [ %call, %if.then ] 28; CHECK: sub nsw i32 %b, %[[PHI]], !dbg [[testMergedLoc:![0-9]+]] 29; CHECK: ret i32 30 31define i32 @test(i32 %a, i32 %b) !dbg !6 { 32entry: 33 %tobool = icmp ne i32 %a, 0, !dbg !8 34 br i1 %tobool, label %if.then, label %if.else, !dbg !8 35 36if.then: ; preds = %entry 37 %call = call i32 @foo(), !dbg !9 38 %sub = sub nsw i32 %b, %call, !dbg !10 39 br label %if.end, !dbg !11 40 41if.else: ; preds = %entry 42 %call1 = call i32 @bar(), !dbg !12 43 %sub2 = sub nsw i32 %b, %call1, !dbg !13 44 br label %if.end 45 46if.end: ; preds = %if.else, %if.then 47 %b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ] 48 ret i32 %b.addr.0, !dbg !14 49} 50 51; When the commoned instructions have the same debug location, this location 52; should be used as the location of the common instruction. 53 54; Generated from source (with -mllvm -no-discriminators and -gno-column-info): 55 56; int test2(int a, int b) { 57; if(a) b -= foo(); else b -= bar(); 58; return b; 59; } 60 61; CHECK: define i32 @test2 62; CHECK-LABEL: if.end: 63; CHECK: %[[PHI:.*]] = phi i32 [ %call1, %if.else ], [ %call, %if.then ] 64; CHECK: sub nsw i32 %b, %[[PHI]], !dbg [[test2Loc:![0-9]+]] 65; CHECK: ret i32 66 67define i32 @test2(i32 %a, i32 %b) !dbg !15 { 68entry: 69 %tobool = icmp ne i32 %a, 0, !dbg !16 70 br i1 %tobool, label %if.then, label %if.else, !dbg !16 71 72if.then: ; preds = %entry 73 %call = call i32 @foo(), !dbg !16 74 %sub = sub nsw i32 %b, %call, !dbg !16 75 br label %if.end, !dbg !16 76 77if.else: ; preds = %entry 78 %call1 = call i32 @bar(), !dbg !16 79 %sub2 = sub nsw i32 %b, %call1, !dbg !16 80 br label %if.end 81 82if.end: ; preds = %if.else, %if.then 83 %b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ] 84 ret i32 %b.addr.0, !dbg !17 85} 86 87; CHECK: [[testMergedLoc]] = !DILocation(line: 0 88; CHECK: [[test2Loc]] = !DILocation(line: 17 89 90declare i32 @foo() 91declare i32 @bar() 92 93!llvm.dbg.cu = !{!0} 94!llvm.module.flags = !{!3, !4} 95 96!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2) 97!1 = !DIFile(filename: "test.c", directory: "") 98!2 = !{} 99!3 = !{i32 2, !"Dwarf Version", i32 4} 100!4 = !{i32 2, !"Debug Info Version", i32 3} 101!6 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 8, type: !7, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 102!7 = !DISubroutineType(types: !2) 103!8 = !DILocation(line: 9, column: 6, scope: !6) 104!9 = !DILocation(line: 10, column: 10, scope: !6) 105!10 = !DILocation(line: 10, column: 7, scope: !6) 106!11 = !DILocation(line: 10, column: 5, scope: !6) 107!12 = !DILocation(line: 12, column: 10, scope: !6) 108!13 = !DILocation(line: 12, column: 7, scope: !6) 109!14 = !DILocation(line: 13, column: 3, scope: !6) 110!15 = distinct !DISubprogram(name: "test2", scope: !1, file: !1, line: 16, type: !7, isLocal: false, isDefinition: true, scopeLine: 16, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 111!16 = !DILocation(line: 17, scope: !15) 112!17 = !DILocation(line: 18, scope: !15) 113