derek.holloway
7502bf64a4
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41 lines
1.6 KiB
LLVM
41 lines
1.6 KiB
LLVM
; RUN: opt < %s -S -passes=loop-unroll,simplifycfg -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s
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; PR12513: Loop unrolling breaks with indirect branches.
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; If loop unrolling attempts to transform this loop, it replaces the
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; indirectbr successors. SimplifyCFG then considers them to be unreachable.
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declare void @subtract() nounwind uwtable
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; CHECK-NOT: unreachable
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define i32 @main(i32 %argc, ptr nocapture %argv) nounwind uwtable {
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entry:
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%vals19 = alloca [5 x i32], align 16
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%x20 = alloca i32, align 4
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store i32 135, ptr %x20, align 4
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br label %for.body
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for.body: ; preds = ; %call2_termjoin, %call3_termjoin
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%indvars.iv = phi i64 [ 0, %entry ], [ %joinphi15.in.in, %call2_termjoin ]
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%a6 = call coldcc ptr @funca(ptr blockaddress(@main, %for.body_code), ptr
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blockaddress(@main, %for.body_codeprime)) nounwind
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indirectbr ptr %a6, [label %for.body_code, label %for.body_codeprime]
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for.body_code: ; preds = %for.body
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call void @subtract()
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br label %call2_termjoin
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call2_termjoin: ; preds = %for.body_codeprime, %for.body_code
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%joinphi15.in.in = add i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %joinphi15.in.in, 5
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %call2_termjoin
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ret i32 0
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for.body_codeprime: ; preds = %for.body
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call void @subtract_v2(i64 %indvars.iv)
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br label %call2_termjoin
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}
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declare coldcc ptr @funca(ptr, ptr) readonly
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declare void @subtract_v2(i64) nounwind uwtable
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