[llvm-dev] [cfe-dev] How to debug if LTO generate wrong code?
Rafael Espíndola via llvm-dev
llvm-dev at lists.llvm.org
Tue May 31 06:21:05 PDT 2016
On 31 May 2016 at 01:08, Shi, Steven <steven.shi at intel.com> wrote:
> 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.
Small, but PIC.
> For example if you read a global like this the compiler will generate this code.
> int constant = 0;
> int get_constant(void)
> return constant;
Compiling for ELF with -FPIE -Os I get
get_constant: # @get_constant
# BB#0: # %entry
movl constant(%rip), %eax
Which should also be able to run at any address.
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