18f8106f31
This patch implements an LLVM IR pass, named kernel-info, that reports various statistics for codes compiled for GPUs. The ultimate goal of these statistics to help identify bad code patterns and ways to mitigate them. The pass operates at the LLVM IR level so that it can, in theory, support any LLVM-based compiler for programming languages supporting GPUs. It has been tested so far with LLVM IR generated by Clang for OpenMP offload codes targeting NVIDIA GPUs and AMD GPUs. By default, the pass runs at the end of LTO, and options like ``-Rpass=kernel-info`` enable its remarks. Example `opt` and `clang` command lines appear in `llvm/docs/KernelInfo.rst`. Remarks include summary statistics (e.g., total size of static allocas) and individual occurrences (e.g., source location of each alloca). Examples of its output appear in tests in `llvm/test/Analysis/KernelInfo`.
118 lines
5.8 KiB
LLVM
118 lines
5.8 KiB
LLVM
; Check info on allocas.
|
|
|
|
; RUN: opt -pass-remarks=kernel-info -passes=kernel-info \
|
|
; RUN: -disable-output %s 2>&1 | \
|
|
; RUN: FileCheck -match-full-lines %s
|
|
|
|
target datalayout = "e-i64:64-i128:128-v16:16-v32:32-n16:32:64"
|
|
target triple = "nvptx64-nvidia-cuda"
|
|
|
|
define void @h() !dbg !100 {
|
|
entry:
|
|
; CHECK: remark: test.c:0:0: in artificial function 'h', artificial alloca ('%dyn_ptr.addr') for 'dyn_ptr' with static size of 8 bytes
|
|
%dyn_ptr.addr = alloca ptr, align 8
|
|
; CHECK: remark: test.c:14:9: in artificial function 'h', alloca ('%i') for 'i' with static size of 4 bytes
|
|
%i = alloca i32, align 4
|
|
; CHECK: remark: test.c:15:9: in artificial function 'h', alloca ('%a') for 'a' with static size of 8 bytes
|
|
%a = alloca [2 x i32], align 4
|
|
%size = load i32, ptr %i, align 4
|
|
; CHECK: remark: test.c:16:9: in artificial function 'h', alloca ('%adyn') for 'adyn' with dynamic size
|
|
%adyn = alloca i32, i32 %size, align 4
|
|
; CHECK: remark: <unknown>:0:0: in artificial function 'h', alloca ('%nodbg') without debug info with static size of 4 bytes
|
|
%nodbg = alloca i32, align 4
|
|
tail call void @llvm.dbg.declare(metadata ptr %dyn_ptr.addr, metadata !110, metadata !DIExpression()), !dbg !114
|
|
tail call void @llvm.dbg.declare(metadata ptr %i, metadata !120, metadata !DIExpression()), !dbg !121
|
|
tail call void @llvm.dbg.declare(metadata ptr %a, metadata !130, metadata !DIExpression()), !dbg !131
|
|
tail call void @llvm.dbg.declare(metadata ptr %adyn, metadata !140, metadata !DIExpression()), !dbg !141
|
|
br label %non-entry
|
|
|
|
non-entry:
|
|
; CHECK: remark: test.c:17:9: in artificial function 'h', alloca ('%i2') for 'i2' with static size of 4 bytes
|
|
%i2 = alloca i32, align 4
|
|
%size2 = load i32, ptr %i2, align 4
|
|
; CHECK: remark: test.c:18:9: in artificial function 'h', alloca ('%adyn2') for 'adyn2' with dynamic size
|
|
%adyn2 = alloca i32, i32 %size, align 4
|
|
tail call void @llvm.dbg.declare(metadata ptr %i2, metadata !150, metadata !DIExpression()), !dbg !151
|
|
tail call void @llvm.dbg.declare(metadata ptr %adyn2, metadata !160, metadata !DIExpression()), !dbg !161
|
|
ret void
|
|
}
|
|
; CHECK: remark: test.c:13:0: in artificial function 'h', Allocas = 7
|
|
; CHECK: remark: test.c:13:0: in artificial function 'h', AllocasStaticSizeSum = 28
|
|
; CHECK: remark: test.c:13:0: in artificial function 'h', AllocasDyn = 2
|
|
|
|
define void @g() !dbg !200 {
|
|
entry:
|
|
; CHECK: remark: test.c:4:7: in function 'g', alloca ('%i') for 'i' with static size of 4 bytes
|
|
%i = alloca i32, align 4
|
|
; CHECK: remark: test.c:5:7: in function 'g', alloca ('%a') for 'a' with static size of 8 bytes
|
|
%a = alloca [2 x i32], align 4
|
|
tail call void @llvm.dbg.declare(metadata ptr %i, metadata !210, metadata !DIExpression()), !dbg !211
|
|
tail call void @llvm.dbg.declare(metadata ptr %a, metadata !220, metadata !DIExpression()), !dbg !221
|
|
ret void
|
|
}
|
|
; CHECK: remark: test.c:3:0: in function 'g', Allocas = 2
|
|
; CHECK: remark: test.c:3:0: in function 'g', AllocasStaticSizeSum = 12
|
|
; CHECK: remark: test.c:3:0: in function 'g', AllocasDyn = 0
|
|
|
|
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
|
|
declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
|
|
|
|
; uselistorder directives
|
|
uselistorder ptr @llvm.dbg.declare, { 7, 6, 5, 4, 3, 2, 1, 0 }
|
|
|
|
attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
|
|
|
|
!llvm.module.flags = !{!0}
|
|
!llvm.dbg.cu = !{!1}
|
|
|
|
!0 = !{i32 2, !"Debug Info Version", i32 3}
|
|
!1 = distinct !DICompileUnit(language: DW_LANG_C11, file: !2, producer: "clang version 19.0.0git", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
|
|
!2 = !DIFile(filename: "test.c", directory: "/tmp")
|
|
!3 = !{null}
|
|
!4 = !{}
|
|
|
|
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
|
|
|
!20 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !21)
|
|
!21 = !DIDerivedType(tag: DW_TAG_restrict_type, baseType: !22)
|
|
!22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
|
|
|
|
!30 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 64, elements: !31)
|
|
!31 = !{!32}
|
|
!32 = !DISubrange(count: 2)
|
|
|
|
!40 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, elements: !41)
|
|
!41 = !{!42}
|
|
!42 = !DISubrange(count: !43)
|
|
!43 = !DILocalVariable(name: "__vla_expr0", scope: !100, type: !10, flags: DIFlagArtificial)
|
|
|
|
!100 = distinct !DISubprogram(name: "h", scope: !2, file: !2, line: 13, type: !101, scopeLine: 13, flags: DIFlagArtificial | DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition, unit: !1, retainedNodes: !4)
|
|
!101 = distinct !DISubroutineType(types: !3)
|
|
|
|
!110 = !DILocalVariable(name: "dyn_ptr", arg: 1, scope: !100, type: !20, flags: DIFlagArtificial)
|
|
!114 = !DILocation(line: 0, scope: !100)
|
|
|
|
!120 = !DILocalVariable(name: "i", scope: !100, file: !2, line: 14, type: !10)
|
|
!121 = !DILocation(line: 14, column: 9, scope: !100)
|
|
|
|
!130 = !DILocalVariable(name: "a", scope: !100, file: !2, line: 15, type: !30)
|
|
!131 = !DILocation(line: 15, column: 9, scope: !100)
|
|
|
|
!140 = !DILocalVariable(name: "adyn", scope: !100, file: !2, line: 16, type: !40)
|
|
!141 = !DILocation(line: 16, column: 9, scope: !100)
|
|
|
|
!150 = !DILocalVariable(name: "i2", scope: !100, file: !2, line: 17, type: !10)
|
|
!151 = !DILocation(line: 17, column: 9, scope: !100)
|
|
|
|
!160 = !DILocalVariable(name: "adyn2", scope: !100, file: !2, line: 18, type: !40)
|
|
!161 = !DILocation(line: 18, column: 9, scope: !100)
|
|
|
|
!200 = distinct !DISubprogram(name: "g", scope: !2, file: !2, line: 3, type: !201, scopeLine: 3, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !4)
|
|
!201 = !DISubroutineType(types: !3)
|
|
|
|
!210 = !DILocalVariable(name: "i", scope: !200, file: !2, line: 4, type: !10)
|
|
!211 = !DILocation(line: 4, column: 7, scope: !200)
|
|
|
|
!220 = !DILocalVariable(name: "a", scope: !200, file: !2, line: 5, type: !30)
|
|
!221 = !DILocation(line: 5, column: 7, scope: !200)
|