<div dir="ltr">The code you've pasted there is inconsistent in variable names. Your created an instruction called 'op1' but your print uses 'v1'. What should be an '->' is just a '-'. You also have a variable in your print called 'op' but that's not declared in your code. Also the result of dyn_cast should always be checked for null before using the result.</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature">~Craig</div></div>
<br><div class="gmail_quote">On Fri, Mar 9, 2018 at 9:18 AM, Zhou Zhizhong via llvm-dev <span dir="ltr"><<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I’m writing a loop-free LLVM pass, my thought is to track if the value inside the loop is changed, so I look up the Instruction StoreInst first and try to get its value in a set. I checked getValueOperand(), getValueName() in the API document but unfortunately they failed the compilation.<br>
<br>
if (isa<StoreInst>(I)){<br>
Value* v = I.getOperand(0);<br>
Instruction* op1 = dyn_cast<Instruction>(v);<br>
errs()<< v << "\t" << v1-getName()<<"\t"<<op<<\n"<br>
}<br>
<br>
Any suggestions on this?<br>
<br>
Thanks,<br>
Ethan<br>
<br>
<br>
<br>
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