[cfe-dev] [llvm-dev] How to debug if LTO generate wrong code?
Shi, Steven via cfe-dev
cfe-dev at lists.llvm.org
Tue May 31 01:08:14 PDT 2016
Hi Mehdi,
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;
int get_constant(void)
{
return constant;
}
(lldb) dis -n get_constant -b
a.out`get_constant:
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
Steven Shi
Intel\SSG\STO\UEFI Firmware
Tel: +86 021-61166522
iNet: 821-6522
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