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Summary: Calls to convergent functions can be duplicated, but only if the duplicates are not control-flow dependent on any additional values. Loop rotation doesn't meet the bar. Reviewers: jingyue Subscribers: mzolotukhin, llvm-commits, arsenm, joker.eph, resistor, tra, hfinkel, broune Differential Revision: http://reviews.llvm.org/D17127 llvm-svn: 260729
32 lines
619 B
LLVM
32 lines
619 B
LLVM
; RUN: opt -S -loop-rotate < %s | FileCheck %s
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@e = global i32 10
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declare void @f1(i32) convergent
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declare void @f2(i32)
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; The call to f1 in the loop header shouldn't be duplicated (meaning, loop
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; rotation shouldn't occur), because f1 is convergent.
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; CHECK: call void @f1
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; CHECK-NOT: call void @f1
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define void @test(i32 %x) {
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entry:
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br label %loop
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loop:
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%n.phi = phi i32 [ %n, %loop.fin ], [ 0, %entry ]
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call void @f1(i32 %n.phi)
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%cond = icmp eq i32 %n.phi, %x
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br i1 %cond, label %exit, label %loop.fin
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loop.fin:
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%n = add i32 %n.phi, 1
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call void @f2(i32 %n)
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br label %loop
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exit:
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ret void
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}
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