I was expecting a bit better performance (in absolute terms),

Could you double-check one thing? Run 'mipsel-linux-objdump -d 
crypto/sha/sha1-mips.o | grep ror | wc'. Do you get a lot of hits? This is to 
double-check that -mips32r2 was in fact effective and passed down 
_MIPS_ARCH_MIPS32R2 pre-define.

$ mipsel-linux-objdump -d crypto/sha/sha1-mips.o | grep ror | wc
    240     960    8320
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