K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2020-05-09T21:34:50.499722Z
K 7
svn:log
V 373
MFC 357313: Trim duplicate CSR swaps from user exceptions.

The stack pointer is swapped with the sscratch CSR just before the
jump to cpu_exception_handler_user where the first instruction swaps
it again.  The two swaps together are a no-op, but the csr swap
instructions can be expensive (e.g. on Bluespec RISC-V cores csr swap
instructions force a full pipeline stall).

END