198e0a12f6
Make sure the code comments in processMemSetMemCpyDependence match with the actual transform. They indicated that the memset being rewritten was sunk to after a memcpy, while it actually is inserted just before the memcpy. Also make sure we use the debug location of the original memset when creating the new simplified memset. In the past we've been using the debug location for the memcpy which could be a bit confusing. Differential Revision: https://reviews.llvm.org/D135574
48 lines
2.4 KiB
LLVM
48 lines
2.4 KiB
LLVM
; RUN: opt -passes=memcpyopt -S %s -verify-memoryssa | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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@C = external constant [0 x i8]
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declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1)
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture readonly, i64, i1)
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define void @test_constant(i64 %src_size, ptr %dst, i64 %dst_size, i8 %c) !dbg !5 {
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; CHECK-LABEL: @test_constant(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i64 [[DST_SIZE:%.*]], [[SRC_SIZE:%.*]], !dbg [[DBG11:![0-9]+]]
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; CHECK-NEXT: [[TMP2:%.*]] = sub i64 [[DST_SIZE]], [[SRC_SIZE]], !dbg [[DBG11]]
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; CHECK-NEXT: [[TMP3:%.*]] = select i1 [[TMP1]], i64 0, i64 [[TMP2]], !dbg [[DBG11]]
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i8, ptr [[DST:%.*]], i64 [[SRC_SIZE]], !dbg [[DBG11]]
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; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP4]], i8 [[C:%.*]], i64 [[TMP3]], i1 false), !dbg [[DBG11]]
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr [[DST]], ptr @C, i64 [[SRC_SIZE]], i1 false), !dbg [[DBG12:![0-9]+]]
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; CHECK-NEXT: ret void, !dbg [[DBG13:![0-9]+]]
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;
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call void @llvm.memset.p0.i64(ptr %dst, i8 %c, i64 %dst_size, i1 false), !dbg !11
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call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr @C, i64 %src_size, i1 false), !dbg !12
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ret void, !dbg !13
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}
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; Validate that the memset is mapped to DILocation for the original memset.
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; CHECK: [[DBG11]] = !DILocation(line: 1,
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; CHECK: [[DBG12]] = !DILocation(line: 2,
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; CHECK: [[DBG13]] = !DILocation(line: 3,
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!llvm.dbg.cu = !{!0}
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!llvm.debugify = !{!2, !3}
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!llvm.module.flags = !{!4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "memset-memcpy-dbgloc.ll", directory: "/")
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!2 = !{i32 3}
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!3 = !{i32 1}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = distinct !DISubprogram(name: "test_constant", linkageName: "test_constant", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
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!6 = !DISubroutineType(types: !7)
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!7 = !{}
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!8 = !{!9}
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!9 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 3, type: !10)
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!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
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!11 = !DILocation(line: 1, column: 1, scope: !5)
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!12 = !DILocation(line: 2, column: 1, scope: !5)
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!13 = !DILocation(line: 3, column: 1, scope: !5)
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