2012-04-09-unroll-indirectbr.ll
1.55 KB
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; RUN: opt < %s -S -loop-unroll -simplifycfg | FileCheck %s
; PR12513: Loop unrolling breaks with indirect branches.
; If loop unrolling attempts to transform this loop, it replaces the
; indirectbr successors. SimplifyCFG then considers them to be unreachable.
declare void @subtract() nounwind uwtable
; CHECK-NOT: unreachable
define i32 @main(i32 %argc, i8** nocapture %argv) nounwind uwtable {
entry:
%vals19 = alloca [5 x i32], align 16
%x20 = alloca i32, align 4
store i32 135, i32* %x20, align 4
br label %for.body
for.body: ; preds = ; %call2_termjoin, %call3_termjoin
%indvars.iv = phi i64 [ 0, %entry ], [ %joinphi15.in.in, %call2_termjoin ]
%a6 = call coldcc i8* @funca(i8* blockaddress(@main, %for.body_code), i8*
blockaddress(@main, %for.body_codeprime)) nounwind
indirectbr i8* %a6, [label %for.body_code, label %for.body_codeprime]
for.body_code: ; preds = %for.body
call void @subtract()
br label %call2_termjoin
call2_termjoin: ; preds = %for.body_codeprime, %for.body_code
%joinphi15.in.in = add i64 %indvars.iv, 1
%exitcond = icmp eq i64 %joinphi15.in.in, 5
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %call2_termjoin
ret i32 0
for.body_codeprime: ; preds = %for.body
call void @subtract_v2(i64 %indvars.iv)
br label %call2_termjoin
}
declare coldcc i8* @funca(i8*, i8*) readonly
declare void @subtract_v2(i64) nounwind uwtable