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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15427 91177308-0d34-0410-b5e6-96231b3b80d8
20 lines
590 B
LLVM
20 lines
590 B
LLVM
; If the result of an instruction is only used outside of the loop, sink
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; the instruction to the exit blocks instead of executing it on every
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; iteration of the loop.
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;
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; RUN: llvm-as < %s | opt -licm | llvm-dis | %prcontext mul 1 | grep Out:
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int %test(int %N) {
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Entry:
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br label %Loop
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Loop:
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%N_addr.0.pn = phi int [ %dec, %Loop ], [ %N, %Entry ]
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%tmp.6 = mul int %N, %N_addr.0.pn
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%tmp.7 = sub int %tmp.6, %N
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%dec = add int %N_addr.0.pn, -1
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%tmp.1 = setne int %N_addr.0.pn, 1
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br bool %tmp.1, label %Loop, label %Out
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Out:
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ret int %tmp.7
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}
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