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22 lines
601 B
LLVM
22 lines
601 B
LLVM
; This testcase tests for a problem where LICM hoists loads out of a loop
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; despite the fact that calls to unknown functions may modify what is being
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; loaded from. Basically if the load gets hoisted, the subtract gets turned
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; into a constant zero.
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;
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; RUN: llvm-upgrade < %s | llvm-as | opt -licm -load-vn -gcse -instcombine | llvm-dis | grep load
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%X = global int 7
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declare void %foo()
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int %test(bool %c) {
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%A = load int *%X
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br label %Loop
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Loop:
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call void %foo()
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%B = load int *%X ;; Should not hoist this load!
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br bool %c, label %Loop, label %Out
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Out:
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%C = sub int %A, %B
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ret int %C
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}
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