ad4d018202
Summary: Teach LoopRotate to preserve MemorySSA. Enable tests for correctness, dependency disabled by default. Subscribers: sanjoy, jlebar, Prazek, george.burgess.iv, llvm-commits Differential Revision: https://reviews.llvm.org/D51718 llvm-svn: 345216
35 lines
754 B
LLVM
35 lines
754 B
LLVM
; RUN: opt < %s -loop-rotate -S | FileCheck %s
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; RUN: opt < %s -loop-rotate -enable-mssa-loop-dependency=true -verify-memoryssa -S | FileCheck %s
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; Test alloca in -loop-rotate.
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; We expect a different value for %ptr each iteration (according to the
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; definition of alloca). I.e. each @use must be paired with an alloca.
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; CHECK: call void @use(i8* %
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; CHECK: %ptr = alloca i8
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@e = global i16 10
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declare void @use(i8*)
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define void @test() {
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entry:
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%end = load i16, i16* @e
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br label %loop
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loop:
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%n.phi = phi i16 [ %n, %loop.fin ], [ 0, %entry ]
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%ptr = alloca i8
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%cond = icmp eq i16 %n.phi, %end
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br i1 %cond, label %exit, label %loop.fin
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loop.fin:
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%n = add i16 %n.phi, 1
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call void @use(i8* %ptr)
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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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