[gmp-bugs] Build feedback for gmp-6.1.0

[Torbjörn Granlund]

Marc Glisse <marc.glisse at inria.fr> writes:

  >    /usr/bin/gcc -c -DHAVE_CONFIG_H -I. -I.. -D__GMP_WITHIN_GMP -I.. -DOPERATION_lshift \
  > 	-I/usr/uumath/include -I/usr/uumath/include -Wa,--noexecstack tmp-lshift.s -fPIC \
  > 	-DPIC -o .libs/lshift.o
  
  Do you have CFLAGS set or something? I find your list of flags
  surprisingly short.
  
Indeed.

  >    tmp-lshift.s: Assembler messages:
  >    tmp-lshift.s:106: Error: selected processor does not support `vdup.32 d6,r3' in ARM mode
  
  What selected processor is that? Maybe adding -v to a gcc invocation
  would give information.

The /proc/cpuinfo suggest Cortex C9.  It has Neon, and we do attempt to
put the compiler/assembler into a mode where Neon insn are accepted.  Yet...
  
  >    tmp-lshift.s:108: Error: selected processor does not support `vdup.32 d7,r3' in ARM mode
  >    tmp-lshift.s:114: Error: selected processor does not support `vshl.u64 d18,d19,d7' in ARM mode
  >    tmp-lshift.s:120: Error: selected processor does not support `vshl.u64 d4,d19,d6' in ARM mode
  ...

indicates that Neon insn are not accepted.


-- 
Torbjörn
Please encrypt, key id 0xC8601622