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Just one update: the function causing the segmentation fault is the following: 359 void DwarfDebug::constructAbstractSubprogramScopeDIE(LexicalScope *Scope) { 360 assert(Scope && Scope->getScopeNode()); 361 assert(Scope->isAbstractScope()); 362 assert(!Scope->getInlinedAt()); 363 364 const MDNode *SP = Scope->getScopeNode(); 365 366

Hi Paul, Thanks for your response. Let me actually post more details visualizing my case. Assuming that can help. so the IR before the opt tool is running is: ; Function Attrs: nounwind define i16 @main() #0 !dbg !13 { entry: %retval = alloca i16, align 1 ... } ; Function Attrs: inlinehint nounwind define internal void @delay(i16 %d) #4 !dbg !69 { entry: %d.addr = alloca i16,

...ton -- If it's not fun you're not doing it right -- Fran Tarkenton -- If it's not fun you're not doing it right -- Fran Tarkenton -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180112/60d8fc92/attachment.html>