d26b43ff4f
Add a pass to convert jump tables to switches. The new pass replaces an indirect call with a switch + direct calls if all the functions in the jump table are smaller than the provided threshold. The pass is currently disabled by default and can be enabled by -enable-jump-table-to-switch. Test plan: ninja check-all
37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
LLVM
; RUN: opt < %s -passes=jump-table-to-switch -pass-remarks=jump-table-to-switch -S -o /dev/null 2>&1 | FileCheck %s
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; CHECK: remark: /tmp/tmp.cc:2:20: expanded indirect call into switch
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@func_array = constant [2 x ptr] [ptr @func0, ptr @func1]
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define i32 @func0() {
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ret i32 1
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}
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define i32 @func1() {
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ret i32 2
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}
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define i32 @function_with_jump_table(i32 %index) {
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%gep = getelementptr inbounds [2 x ptr], ptr @func_array, i32 0, i32 %index
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%func_ptr = load ptr, ptr %gep
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%result = call i32 %func_ptr(), !dbg !8
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ret i32 %result
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 18.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "/tmp/tmp.cc", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"PIC Level", i32 2}
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!5 = !{!"clang version 18.0.0 "}
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!6 = distinct !DISubprogram(name: "success", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 2, column: 20, scope: !6)
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!9 = !DILocation(line: 2, column: 21, scope: !6)
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!10 = !DILocation(line: 2, column: 22, scope: !6)
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