Index: llvm/lib/Transforms/Utils/InlineFunction.cpp =================================================================== --- llvm/lib/Transforms/Utils/InlineFunction.cpp +++ llvm/lib/Transforms/Utils/InlineFunction.cpp @@ -1842,6 +1842,7 @@ // Scan for the block of allocas that we can move over, and move them // all at once. while (isa(I) && + !cast(I)->use_empty() && allocaWouldBeStaticInEntry(cast(I))) { IFI.StaticAllocas.push_back(cast(I)); ++I; Index: llvm/test/Transforms/Inline/inline-skip-use-empty-alloca.ll =================================================================== --- /dev/null +++ llvm/test/Transforms/Inline/inline-skip-use-empty-alloca.ll @@ -0,0 +1,71 @@ +; RUN: opt < %s -S -inline | FileCheck %s +; RUN: opt < %s -S -strip-debug -inline | FileCheck %s + +; https://bugs.llvm.org/show_bug.cgi?id=43291 +; The purpose of this test is to check if there is use_empty in the inner loop when scanning +; blocks of allocas, if the alloca is use_empty, skip it when allocas inlining. + +define void @foo(i16 %k) !dbg !6 { + call void @llvm.dbg.value(metadata i16 %k, metadata !14, metadata !DIExpression()), !dbg !15 + %alloca_a = alloca i32 + call void @llvm.dbg.value(metadata i16 %k, metadata !14, metadata !DIExpression()), !dbg !15 + %alloca_b = alloca [3 x i32] + call void @llvm.dbg.value(metadata i16 %k, metadata !14, metadata !DIExpression()), !dbg !15 + %alloca_c = alloca i32 + call void @llvm.dbg.value(metadata i16 %k, metadata !14, metadata !DIExpression()), !dbg !15 + %alloca_a..1 = bitcast i32* %alloca_a to i8**, !dbg !16 + %alloca_c..1 = bitcast i32* %alloca_c to i8**, !dbg !16 + %_tmp23 = icmp ne i16 %k, 0 + br i1 %_tmp23, label %bb1, label %bb2 + +bb1: ; preds = %0 + %_tmp28 = getelementptr [3 x i32], [3 x i32]* %alloca_b, i16 0, i64 0 + store i32 0, i32* %_tmp28 + br label %bb2 + +bb2: ; preds = %bb1, %0 + ret void +} + +define i16 @bar() !dbg !17 { + ; CHECK-LABEL: bar + ; CHECK: %alloca_a.i = alloca i32 + ; CHECK-NOT: %alloca_b.i = alloca [3 x i32] + ; CHECK: %alloca_c.i = alloca i32 + call void @foo(i16 0), !dbg !20 + br label %bb1 + +bb1: ; preds = %0 + ret i16 0 +} + +; Function Attrs: nounwind readnone speculatable willreturn +declare void @llvm.dbg.value(metadata, metadata, metadata) #0 + +attributes #0 = { nounwind readnone speculatable willreturn } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4} +!llvm.ident = !{!5} + +!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "Foo", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2) +!1 = !DIFile(filename: "foo2.c", directory: "/tmp") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{!"Foo"} +!6 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 17, type: !7, scopeLine: 17, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) +!7 = !DISubroutineType(types: !8) +!8 = !{!9, !13} +!9 = !DIDerivedType(tag: DW_TAG_typedef, name: "int64_t", file: !10, line: 76, baseType: !11) +!10 = !DIFile(filename: "stdint.h", directory: "/tmp") +!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "__i64_t", file: !1, baseType: !12) +!12 = !DIBasicType(name: "signed long long", size: 64, encoding: DW_ATE_signed) +!13 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed) +!14 = !DILocalVariable(name: "k", arg: 1, scope: !6, file: !1, line: 17, type: !13) +!15 = !DILocation(line: 0, scope: !6) +!16 = !DILocation(line: 19, column: 3, scope: !6) +!17 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 8, type: !18, scopeLine: 8, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) +!18 = !DISubroutineType(types: !19) +!19 = !{!13} +!20 = !DILocation(line: 8, column: 7, scope: !17)