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b0968e671c
Revision 289661 introduced the function DILocation::getMergedLocation for merging of debug locations. At the time is was simply a stub which always returned no location. This patch modifies getMergedLocation to handle the case where the two locations are the same or can't be discriminated. Differential Revision: https://reviews.llvm.org/D28521 llvm-svn: 291809
111 lines
3.9 KiB
LLVM
111 lines
3.9 KiB
LLVM
; RUN: opt -simplifycfg -S < %s | FileCheck %s
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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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; Simplify CFG will try to sink the last instruction in a series of basic
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; blocks, creating a "common" instruction in the successor block. If the
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; debug locations of the commoned instructions have different file/line
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; numbers the debug location of the common instruction should not be set.
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; Generated from source:
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; extern int foo(void);
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; extern int bar(void);
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;
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; int test(int a, int b) {
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; if(a)
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; b -= foo();
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; else
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; b -= bar();
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; return b;
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; }
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; CHECK: define i32 @test
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; CHECK-LABEL: if.end:
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; CHECK: %[[PHI:.*]] = phi i32 [ %call1, %if.else ], [ %call, %if.then ]
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; CHECK: sub nsw i32 %b, %[[PHI]]
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; CHECK-NOT: !dbg
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; CHECK: ret i32
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define i32 @test(i32 %a, i32 %b) !dbg !6 {
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entry:
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%tobool = icmp ne i32 %a, 0, !dbg !8
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br i1 %tobool, label %if.then, label %if.else, !dbg !8
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if.then: ; preds = %entry
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%call = call i32 @foo(), !dbg !9
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%sub = sub nsw i32 %b, %call, !dbg !10
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br label %if.end, !dbg !11
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if.else: ; preds = %entry
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%call1 = call i32 @bar(), !dbg !12
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%sub2 = sub nsw i32 %b, %call1, !dbg !13
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ]
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ret i32 %b.addr.0, !dbg !14
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}
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; When the commoned instructions have the same debug location, this location
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; should be used as the location of the common instruction.
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; Generated from source (with -mllvm -no-discriminators and -gno-column-info):
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; int test2(int a, int b) {
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; if(a) b -= foo(); else b -= bar();
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; return b;
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; }
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; CHECK: define i32 @test2
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; CHECK-LABEL: if.end:
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; CHECK: %[[PHI:.*]] = phi i32 [ %call1, %if.else ], [ %call, %if.then ]
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; CHECK: sub nsw i32 %b, %[[PHI]], !dbg ![[DBG:.*]]
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; CHECK: ret i32
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; CHECK: ![[DBG]] = !DILocation(line: 17, scope: !{{.*}})
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define i32 @test2(i32 %a, i32 %b) !dbg !15 {
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entry:
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%tobool = icmp ne i32 %a, 0, !dbg !16
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br i1 %tobool, label %if.then, label %if.else, !dbg !16
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if.then: ; preds = %entry
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%call = call i32 @foo(), !dbg !16
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%sub = sub nsw i32 %b, %call, !dbg !16
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br label %if.end, !dbg !16
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if.else: ; preds = %entry
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%call1 = call i32 @bar(), !dbg !16
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%sub2 = sub nsw i32 %b, %call1, !dbg !16
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ]
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ret i32 %b.addr.0, !dbg !17
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}
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declare i32 @foo()
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declare i32 @bar()
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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!1 = !DIFile(filename: "test.c", 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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!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, variables: !2)
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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 9, column: 6, scope: !6)
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!9 = !DILocation(line: 10, column: 10, scope: !6)
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!10 = !DILocation(line: 10, column: 7, scope: !6)
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!11 = !DILocation(line: 10, column: 5, scope: !6)
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!12 = !DILocation(line: 12, column: 10, scope: !6)
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!13 = !DILocation(line: 12, column: 7, scope: !6)
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!14 = !DILocation(line: 13, column: 3, scope: !6)
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!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, variables: !2)
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!16 = !DILocation(line: 17, scope: !15)
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!17 = !DILocation(line: 18, scope: !15)
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