subject:"\[PATCH, GCC\/ARM\] Do no clobber r4 in Armv8\-M nonsecure call"

Re: [PATCH, GCC/ARM] Do no clobber r4 in Armv8-M nonsecure call

2017-11-17 Thread Kyrill Tkachov

Hi Thomas, On 15/11/17 17:14, Thomas Preudhomme wrote: Hi, Expanders for Armv8-M nonsecure call unnecessarily clobber r4 despite the libcall they perform not writing to r4. Furthermore, the requirement for the branch target address to be in r4 as expected by the libcall is modeled in a convolu

[PATCH, GCC/ARM] Do no clobber r4 in Armv8-M nonsecure call

2017-11-15 Thread Thomas Preudhomme

Hi, Expanders for Armv8-M nonsecure call unnecessarily clobber r4 despite the libcall they perform not writing to r4. Furthermore, the requirement for the branch target address to be in r4 as expected by the libcall is modeled in a convoluted way in the define_insn patterns: the address is a reg