https://bugs.llvm.org/show_bug.cgi?id=43202
Bug ID: 43202
Summary: ARM FastIsel is renaming the memcpy to
memcpy.<random-number> in getLibcallReg().
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: umesh.kalap...@gmail.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Created attachment 22461
--> https://bugs.llvm.org/attachment.cgi?id=22461&action=edit
testcase
The attached file compiled like
clang --target=arm-linux-eabi -mcpu=cortex-a9 -w -fno-builtin -mlong-calls
testcase.cpp -c; nm testcase.o | grep memcpy
U memcpy
U memcpy.202
U memcpy.203
U memcpy.204
results with linker undefined symbols error .
When we investigated why the codegen renames it ,the following code
ARMFastISel.cpp @ getLibcallReg do so.
>>GlobalValue *GV = new GlobalVariable(M, Type::getInt32Ty(*Context), false,
GlobalValue::ExternalLinkage, nullptr,
Name);
where "Name=memcpy" in this case and GlobalVariable creates new instance with
"Name" if doesn't exist in the module table ,else its renames with appending
the random number to "Name".
But its not the semantics we required here ,hence we modified the code like
>>GlobalValue *GV = cast
>><GlobalVariable>(M.getOrInsertGlobal(Name.getSingleStringRef(),
>>Type::getInt32Ty(*Context)));
where we used Module.getOrInsertGlobal () instead and getOrInsertGlobal()
creates new instance with "Name" if doesn't exist ,else returns the exist one .
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