[PATCH v2] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions

On Tue, 12 Nov 2013, Nicolas Pitre wrote:

On Tue, 12 Nov 2013, M?ns Rullg?rd wrote:

quoted

It might be possible to extract this information from relocation tables.

True, but only for individual .o files.  Once the linker puts them 
together the information is lost, and trying to infer what the linker 
has done is insane.

Filtering the compiler output to annotate idiv calls before it is 
assembled would probably be a better solution.

Another solution is to patch the call site from within __aeabi_idiv at 
run time using lr.  That wouldn't work in the presence of tail call 
optimization though.

Again this might not be worth it and patching __aeabi_idiv instead might 
be a good enough compromize.


Nicolas