Alex Bradbury 0715d35ed5 [RISCV] Reserve an emergency spill slot for the register scavenger when necessary ...

Although the register scavenger can often find a spare register, an emergency 
spill slot is needed to guarantee success. Reserve this slot in cases where 
the function is known to have a large stack (meaning the scavenger may be 
needed when forming stack addresses).

llvm-svn: 322269

2018-01-11 11:17:19 +00:00

9.1 KiB

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