https://bugs.llvm.org/show_bug.cgi?id=45345
Bug ID: 45345
Summary: Bad codegen: funclet Prologue and Epilogue do not
agree on frame size.
Product: libraries
Version: 9.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: daniel.framp...@microsoft.com
CC: arnaud.degrandmai...@arm.com,
llvm-bugs@lists.llvm.org, smithp...@googlemail.com,
ties.st...@arm.com
Created attachment 23288
--> https://bugs.llvm.org/attachment.cgi?id=23288&action=edit
Program that will crash if compiled and run on aarch64-pc-windows-msvc
The generated code for a funclet can have an add to sp in the epilogue for
which there is no corresponding sub in the prologue.
To trigger this case we must be generating a funclet and:
1) The function must make a call where arguments are passed on the stack (these
are the extra bytes the epilog adds).
2) We must not be able to combine the stack adjustment into a single sub to sp
when saving callee-save registers, which will happen if we have an aligned
object or are using alloca.
Attaching simple C++ repro.
Bug exists in both LLVM9 and master.
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