On Fri, 9 Nov 2018, Fredrik Noring wrote:
> gcc/
> * config/mips/mips.c (mips_reorg_process_insns)
> (mips_option_override): Handle `-mfix-r5900'.
> * config/mips/mips.h (ASM_SPEC): Add `mfix-r5900' and
> `mno-fix-r5900'.
> * config/mips/mips.opt (mfix-r5900): N
The short loop bug under certain conditions causes loops to
execute only once or twice, due to a hardware bug in the R5900 chip.
`-march=r5900' already enables the R5900 short loop workaround.
However, the R5900 ISA and most other MIPS ISAs are mutually
exclusive since R5900-specific instructions
