http://llvm.org/bugs/show_bug.cgi?id=9434
Summary: codegen bug with conditionally assigned function
pointers
Product: new-bugs
Version: 2.8
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=6295)
--> (http://llvm.org/bugs/attachment.cgi?id=6295)
C source and makefile to show a likely codegen bug with conditionally assigned
function pointers
I have a pretty simple program that shows a codegen problem.
Specifically, llvm-ld assumes that a function pointer will always be assigned a
non-null value when that's not the case, and inlines the assigned function.
It may be argued that calling a null pointer is undefined, and thus the
assignment could always be done. However, even when including weak linked
functions (whose definition will be changed at runtime), by commenting out the
object file baz.o, this inlining happens rather than the call-through-pointer.
I'm enclosing a simple test program. Use "make" to build and disassemble the
target.
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