[llvm-dev] [cfe-dev] How to debug if LTO generate wrong code?
Shi, Steven via llvm-dev
llvm-dev at lists.llvm.org
Tue May 31 01:08:14 PDT 2016
What's the default code model for x86_64 Mac OS X App? Andrew showed me some example code of Mac OS X App as below, which looks to use the small code model but can run at >4GB high address.
For example if you read a global like this the compiler will generate this code.
int constant = 0;
(lldb) dis -n get_constant -b
a.out[0x100000f8c] <+0>: 55 pushq %rbp
a.out[0x100000f8d] <+1>: 48 89 e5 movq %rsp, %rbp
a.out[0x100000f90] <+4>: 8b 05 6a 00 00 00 movl 0x6a(%rip), %eax
a.out[0x100000f96] <+10>: 5d popq %rbp
a.out[0x100000f97] <+11>: c3 retq
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