In this case, can we instruct GCC to not insert memcpy for structure assignments in the first place? just leave the structure variable assignment un-optimized? Is it possible? I tried with various options like -O0, -fno-builtin, -fno-builtin-function, -fno-tree-loop-distribute-patterns but memcpy is still inserted by GCC. -- GampuZ On Wed, Jul 25, 2018 at 4:26 PM Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> wrote: > On 2018-07-25 16:06 +0530, Gampu Z wrote: > > With -fno-plt, I see that there is reference to > > *call *memcpy@GOTPCREL(%rip)* > > > > Excuse me if this is stupid question, but is it possible to instruct GCC > to > > insert plain memcpy > > call here? (With no PLT or GOTPCREL or any other relocation) > > > > Like this: > > *call memcpy* > > (Similar to the case when -fPIE flag is not specified?) > > Static linking. > > Even if GCC generate "call memcpy", the *linker* would rewrite > it to "call memcpy@PLT" or "call *0xabcdef(%rip)". That's how > dynamic linking works on modern Linux system. > -- > Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> > School of Aerospace Science and Technology, Xidian University >
