http://llvm.org/bugs/show_bug.cgi?id=18974
Bug ID: 18974
Summary: res=__builtin_setjmp(); -> invalid assembler
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
__builtin_setjmp() only works when we immediately switch on its result and
branch into two different code paths. If instead we write this kind of code:
int res = __builtin_setjmp();
do_this_in_all_cases();
then, at least on x86-64, it produces this kind of assembler for the first
line:
movq %rbp, -80(%rbp)
movq %rsp, -64(%rbp)
movq $".LBB4_-1", -72(%rbp)
where ".LBB4_-1" is a bogus label not defined anywhere in the .s file. It
fails to assemble, of course.
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