derek.holloway
7502bf64a4
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58 lines
2.2 KiB
LLVM
58 lines
2.2 KiB
LLVM
; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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; CHECK-NOT: switch
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%llvm.dbg.anchor.type = type { i32, i32 }
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%llvm.dbg.compile_unit.type = type { i32, ptr, i32, ptr, ptr, ptr, i1, i1, ptr }
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@llvm.dbg.compile_units = linkonce constant %llvm.dbg.anchor.type { i32 458752, i32 17 }, section "llvm.metadata"
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@.str = internal constant [4 x i8] c"a.c\00", section "llvm.metadata" ; <ptr> [#uses=1]
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@.str1 = internal constant [6 x i8] c"/tmp/\00", section "llvm.metadata" ; <ptr> [#uses=1]
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@.str2 = internal constant [55 x i8] c"4.2.1 (Based on Apple Inc. build 5636) (LLVM build 00)\00", section "llvm.metadata" ; <ptr> [#uses=1]
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@llvm.dbg.compile_unit = internal constant %llvm.dbg.compile_unit.type { i32 458769, ptr @llvm.dbg.compile_units, i32 1, ptr @.str, ptr @.str1, ptr @.str2, i1 true, i1 false, ptr null }, section "llvm.metadata" ; <ptr> [#uses=1]
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declare void @llvm.dbg.stoppoint(i32, i32, ptr) nounwind
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; Test folding all to same dest
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define i32 @test3(i1 %C) {
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br i1 %C, label %Start, label %TheDest
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Start: ; preds = %0
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call void @llvm.dbg.stoppoint(i32 5, i32 0, ptr @llvm.dbg.compile_unit)
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switch i32 3, label %TheDest [
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i32 0, label %TheDest
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i32 1, label %TheDest
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i32 2, label %TheDest
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i32 5, label %TheDest
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]
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TheDest: ; preds = %Start, %Start, %Start, %Start, %Start, %0
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ret i32 1234
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}
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; Test folding switch -> branch
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define i32 @test4(i32 %C) {
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switch i32 %C, label %L1 [
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i32 0, label %L2
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]
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L1: ; preds = %0
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call void @llvm.dbg.stoppoint(i32 5, i32 0, ptr @llvm.dbg.compile_unit)
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ret i32 0
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L2: ; preds = %0
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call void @llvm.dbg.stoppoint(i32 5, i32 0, ptr @llvm.dbg.compile_unit)
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ret i32 1
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}
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; Can fold into a cond branch!
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define i32 @test5(i32 %C) {
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switch i32 %C, label %L1 [
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i32 0, label %L2
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i32 123, label %L1
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]
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L1: ; preds = %0, %0
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call void @llvm.dbg.stoppoint(i32 5, i32 0, ptr @llvm.dbg.compile_unit)
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ret i32 0
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L2: ; preds = %0
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call void @llvm.dbg.stoppoint(i32 5, i32 0, ptr @llvm.dbg.compile_unit)
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ret i32 1
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}
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