Unsafe foreign calls (fat machine instructions) do not kill all registers.
The new code generator was doing some interesting spilling across
unsafe foreign calls:
_c1ao::I32 = Hp - 4;
I32[Sp - 20] = _c1ao::I32;
foreign "ccall"
newCAF((BaseReg, PtrHint), (R1, PtrHint))[_unsafe_call_];
_c1ao::I32 = I32[Sp - 20];
This is fairly unnecessary, and resulted from over-conservative
liveness analysis from CmmLive. We can see that the old code
generator only saved volatile registers across unsafe foreign calls:
spilling variables was done by saveVolatileVarsAndRegs, which was
only performed for ordinary calls.
This commit removes the excess kill from the liveness analysis, as well
as the *redundant* excess kill from spilling-and-reloading, and adds a
note to CmmNode to this effect. The only registers we need to kill
are the ones that the foreign call assigns to, just like any other
machine instruction.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>