When the inline spiller rematerializes an instruction, take the debug location from the instruction

that immediately follows the rematerialization point.

Patch by Andrea DiBiagio.

Differential Revision: http://reviews.llvm.org/D23539

llvm-svn: 278822

1 files changed, 96 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/X86/rematerialize.ll b/llvm/test/DebugInfo/X86/rematerialize.ll
new file mode 100644
index 00000000000..8eb97c56a95
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/rematerialize.ll
@@ -0,0 +1,96 @@
+; REQUIRES: object-emission
+; RUN: llc -O2 -filetype=obj -mtriple=x86_64-unknown-linux-gnu < %s \
+; RUN: | llvm-dwarfdump -debug-dump=line - | FileCheck %s
+;
+; Generated with clang -O2 -g from
+;
+; typedef float __m128 __attribute__((__vector_size__(16)));
+; 
+; extern __m128 doSomething(__m128, __m128);
+; 
+; 
+; __m128 foo(__m128 X) {     // line 6
+;   const __m128 V = {0.5f, 0.5f, 0.5f, 0.5f};  // line 7
+;   __m128 Sub = X - V;  // line 8
+;   __m128 Add = X + V;  // line 9
+; 
+;   __m128 Result = doSomething(Add, Sub);  // line 11
+; 
+;   return V - Result;  // line 13
+; }
+;
+;
+; We want to see line 13 after line 11 without any other line in between.
+; CHECK:       0x{{[0-9a-f]*}} 11
+; CHECK-NOT:   0x{{[0-9a-f]*}}  8
+; CHECK-NOT:   0x{{[0-9a-f]*}}  9
+; CHECK:       0x{{[0-9a-f]*}} 13
+; CHECK-NOT:   0x{{[0-9a-f]*}}  8
+; CHECK-NOT:   0x{{[0-9a-f]*}}  9
+
+; ModuleID = 'test.c'
+source_filename = "test.c"
+; target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+; target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: nounwind uwtable
+define <4 x float> @foo(<4 x float> %X) local_unnamed_addr #0 !dbg !6 {
+entry:
+  tail call void @llvm.dbg.value(metadata <4 x float> %X, i64 0, metadata !15, metadata !21), !dbg !22
+  tail call void @llvm.dbg.value(metadata <4 x float> <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>, i64 0, metadata !16, metadata !21), !dbg !23
+  %sub = fadd <4 x float> %X, <float -5.000000e-01, float -5.000000e-01, float -5.000000e-01, float -5.000000e-01>, !dbg !24
+  tail call void @llvm.dbg.value(metadata <4 x float> %sub, i64 0, metadata !18, metadata !21), !dbg !25
+  %add = fadd <4 x float> %X, <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>, !dbg !26
+  tail call void @llvm.dbg.value(metadata <4 x float> %add, i64 0, metadata !19, metadata !21), !dbg !27
+  %call = tail call <4 x float> @doSomething(<4 x float> %add, <4 x float> %sub) #3, !dbg !28
+  tail call void @llvm.dbg.value(metadata <4 x float> %call, i64 0, metadata !20, metadata !21), !dbg !29
+  %sub1 = fsub <4 x float> <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>, %call, !dbg !30
+  ret <4 x float> %sub1, !dbg !31
+}
+
+declare <4 x float> @doSomething(<4 x float>, <4 x float>) local_unnamed_addr #1
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { nounwind uwtable }
+attributes #2 = { nounwind readnone }
+attributes #3 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+!llvm.ident = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 278291)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "test.c", directory: "/home/test")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{!"clang version 4.0.0 (trunk 278291)"}
+!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 6, type: !7, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !14)
+!7 = !DISubroutineType(types: !8)
+!8 = !{!9, !9}
+!9 = !DIDerivedType(tag: DW_TAG_typedef, name: "__m128", file: !1, line: 1, baseType: !10)
+!10 = !DICompositeType(tag: DW_TAG_array_type, baseType: !11, size: 128, align: 128, flags: DIFlagVector, elements: !12)
+!11 = !DIBasicType(name: "float", size: 32, align: 32, encoding: DW_ATE_float)
+!12 = !{!13}
+!13 = !DISubrange(count: 4)
+!14 = !{!15, !16, !18, !19, !20}
+!15 = !DILocalVariable(name: "X", arg: 1, scope: !6, file: !1, line: 6, type: !9)
+!16 = !DILocalVariable(name: "V", scope: !6, file: !1, line: 7, type: !17)
+!17 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !9)
+!18 = !DILocalVariable(name: "Sub", scope: !6, file: !1, line: 8, type: !9)
+!19 = !DILocalVariable(name: "Add", scope: !6, file: !1, line: 9, type: !9)
+!20 = !DILocalVariable(name: "Result", scope: !6, file: !1, line: 11, type: !9)
+!21 = !DIExpression()
+!22 = !DILocation(line: 6, column: 19, scope: !6)
+!23 = !DILocation(line: 7, column: 16, scope: !6)
+!24 = !DILocation(line: 8, column: 18, scope: !6)
+!25 = !DILocation(line: 8, column: 10, scope: !6)
+!26 = !DILocation(line: 9, column: 18, scope: !6)
+!27 = !DILocation(line: 9, column: 10, scope: !6)
+!28 = !DILocation(line: 11, column: 19, scope: !6)
+!29 = !DILocation(line: 11, column: 10, scope: !6)
+!30 = !DILocation(line: 13, column: 12, scope: !6)
+!31 = !DILocation(line: 13, column: 3, scope: !6)