; RUN: opt %s -passes=sroa -o - -S \ ; RUN: | FileCheck %s ; RUN: opt --try-experimental-debuginfo-iterators %s -passes=sroa -o - -S \ ; RUN: | FileCheck %s ;; Generated from this C++ source: ;; __attribute__((nodebug)) struct Blob {int P[6];} Glob; ;; __attribute__((nodebug)) int Cond; ;; __attribute__((nodebug)) Blob *C; ;; __attribute__((nodebug)) void call(int); ;; ;; void f() { ;; int A[16]; ;; __attribute__ ((nodebug)) int B[16]; ;; // A[0:6) <- Glob ;; __builtin_memmove(&A[0], &Glob, sizeof(Blob)); ;; call(0); ;; // B[8:14) <- Glob ;; __builtin_memmove(&B[8], &Glob, sizeof(Blob)); ;; call(A[0]); ;; // A[8:14) <- A[0:6) ;; __builtin_memmove(&A[8], &A[0], sizeof(Blob)); ;; call(A[8]); ;; if (Cond) ;; // C <- A[8:14) ;; __builtin_memmove(C, &A[8], sizeof(Blob)); ;; else ;; // C <- B[8:14) ;; __builtin_memmove(C, &B[8], sizeof(Blob)); ;; } ;; ;; using: ;; clang test.cpp -emit-llvm -S -g -O2 -Xclang -disable-llvm-passes -o - \ ;; | opt -passes=declare-to-assign -o test.ll - -S ;; We're interested in variable A and the second memmove with A as a dest (the ;; third memmove in the source). SROA is going to chop up A so that the only ;; Alloca'd slice remaining is what were originally elements 1 through 5 ;; inclusive (element 0 is promoted). Incidentally, the memmove later becomes a ;; memcpy. Check that the dbg.assign address and fragment are correct and ;; ensure the DIAssignID still links it to the memmove(/memcpy). ; CHECK: %A.sroa.0.sroa.5 = alloca [5 x i32] ; CHECK: llvm.memcpy{{.*}}(ptr align 4 %A.sroa.0.sroa.5, ptr align 4 getelementptr inbounds (i8, ptr @Glob, i64 4), i64 20, i1 false){{.*}}!DIAssignID ![[ID:[0-9]+]] ;; Here's the dbg.assign for element 0 - it's not important for the test. ; CHECK-NEXT: llvm.dbg.value({{.*}}!DIExpression(DW_OP_LLVM_fragment, 0, 32){{.*}}) ;; This is the dbg.assign we care about: ; CHECK-NEXT: llvm.dbg.assign(metadata i1 undef, metadata ![[VAR:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 32, 160), metadata ![[ID]], metadata ptr %A.sroa.0.sroa.5, metadata !DIExpression()) ; CHECK: ![[VAR]] = !DILocalVariable(name: "A" source_filename = "test.cpp" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" %struct.Blob = type { [6 x i32] } @Glob = dso_local global %struct.Blob zeroinitializer, align 4 @Cond = dso_local global i32 0, align 4 @C = dso_local global ptr null, align 8 ; Function Attrs: mustprogress uwtable define dso_local void @_Z1fv() #0 !dbg !9 { entry: %A = alloca [16 x i32], align 16, !DIAssignID !18 call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(), metadata !18, metadata ptr %A, metadata !DIExpression()), !dbg !19 %B = alloca [16 x i32], align 16 call void @llvm.lifetime.start.p0(i64 64, ptr %A) #5, !dbg !20 call void @llvm.lifetime.start.p0(i64 64, ptr %B) #5, !dbg !21 %arrayidx = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 0, !dbg !22 call void @llvm.memmove.p0.p0.i64(ptr align 16 %arrayidx, ptr align 4 @Glob, i64 24, i1 false), !dbg !23, !DIAssignID !24 call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 192), metadata !24, metadata ptr %arrayidx, metadata !DIExpression()), !dbg !19 call void @_Z4calli(i32 noundef 0), !dbg !25 %arrayidx1 = getelementptr inbounds [16 x i32], ptr %B, i64 0, i64 8, !dbg !26 call void @llvm.memmove.p0.p0.i64(ptr align 16 %arrayidx1, ptr align 4 @Glob, i64 24, i1 false), !dbg !27 %arrayidx2 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 0, !dbg !28 %0 = load i32, ptr %arrayidx2, align 16, !dbg !28 call void @_Z4calli(i32 noundef %0), !dbg !33 %arrayidx3 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 8, !dbg !34 %arrayidx4 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 0, !dbg !35 call void @llvm.memmove.p0.p0.i64(ptr align 16 %arrayidx3, ptr align 16 %arrayidx4, i64 24, i1 false), !dbg !36, !DIAssignID !37 call void @llvm.dbg.assign(metadata i1 undef, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 256, 192), metadata !37, metadata ptr %arrayidx3, metadata !DIExpression()), !dbg !19 %arrayidx5 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 8, !dbg !38 %1 = load i32, ptr %arrayidx5, align 16, !dbg !38 call void @_Z4calli(i32 noundef %1), !dbg !39 %2 = load i32, ptr @Cond, align 4, !dbg !40 %tobool = icmp ne i32 %2, 0, !dbg !40 br i1 %tobool, label %if.then, label %if.else, !dbg !42 if.then: ; preds = %entry %3 = load ptr, ptr @C, align 8, !dbg !43 %arrayidx6 = getelementptr inbounds [16 x i32], ptr %A, i64 0, i64 8, !dbg !46 call void @llvm.memmove.p0.p0.i64(ptr align 4 %3, ptr align 16 %arrayidx6, i64 24, i1 false), !dbg !47 br label %if.end, !dbg !47 if.else: ; preds = %entry %4 = load ptr, ptr @C, align 8, !dbg !48 %arrayidx7 = getelementptr inbounds [16 x i32], ptr %B, i64 0, i64 8, !dbg !49 call void @llvm.memmove.p0.p0.i64(ptr align 4 %4, ptr align 16 %arrayidx7, i64 24, i1 false), !dbg !50 br label %if.end if.end: ; preds = %if.else, %if.then call void @llvm.lifetime.end.p0(i64 64, ptr %B) #5, !dbg !51 call void @llvm.lifetime.end.p0(i64 64, ptr %A) #5, !dbg !51 ret void, !dbg !51 } declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 declare void @llvm.dbg.declare(metadata, metadata, metadata) #2 declare void @llvm.memmove.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1 immarg) #3 declare void @_Z4calli(i32 noundef) #4 declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #2 !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !1000} !llvm.ident = !{!8} !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 16.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None) !1 = !DIFile(filename: "test.cpp", directory: "/") !2 = !{i32 7, !"Dwarf Version", i32 5} !3 = !{i32 2, !"Debug Info Version", i32 3} !4 = !{i32 1, !"wchar_size", i32 4} !5 = !{i32 8, !"PIC Level", i32 2} !6 = !{i32 7, !"PIE Level", i32 2} !7 = !{i32 7, !"uwtable", i32 2} !8 = !{!"clang version 16.0.0"} !9 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 6, type: !10, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12) !10 = !DISubroutineType(types: !11) !11 = !{null} !12 = !{!13} !13 = !DILocalVariable(name: "A", scope: !9, file: !1, line: 7, type: !14) !14 = !DICompositeType(tag: DW_TAG_array_type, baseType: !15, size: 512, elements: !16) !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !16 = !{!17} !17 = !DISubrange(count: 16) !18 = distinct !DIAssignID() !19 = !DILocation(line: 0, scope: !9) !20 = !DILocation(line: 7, column: 3, scope: !9) !21 = !DILocation(line: 8, column: 3, scope: !9) !22 = !DILocation(line: 10, column: 22, scope: !9) !23 = !DILocation(line: 10, column: 3, scope: !9) !24 = distinct !DIAssignID() !25 = !DILocation(line: 11, column: 3, scope: !9) !26 = !DILocation(line: 13, column: 22, scope: !9) !27 = !DILocation(line: 13, column: 3, scope: !9) !28 = !DILocation(line: 14, column: 8, scope: !9) !33 = !DILocation(line: 14, column: 3, scope: !9) !34 = !DILocation(line: 16, column: 22, scope: !9) !35 = !DILocation(line: 16, column: 29, scope: !9) !36 = !DILocation(line: 16, column: 3, scope: !9) !37 = distinct !DIAssignID() !38 = !DILocation(line: 17, column: 8, scope: !9) !39 = !DILocation(line: 17, column: 3, scope: !9) !40 = !DILocation(line: 18, column: 7, scope: !41) !41 = distinct !DILexicalBlock(scope: !9, file: !1, line: 18, column: 7) !42 = !DILocation(line: 18, column: 7, scope: !9) !43 = !DILocation(line: 20, column: 23, scope: !41) !46 = !DILocation(line: 20, column: 27, scope: !41) !47 = !DILocation(line: 20, column: 5, scope: !41) !48 = !DILocation(line: 23, column: 23, scope: !41) !49 = !DILocation(line: 23, column: 27, scope: !41) !50 = !DILocation(line: 23, column: 5, scope: !41) !51 = !DILocation(line: 24, column: 1, scope: !9) !1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}