Interpreter_FPUtils: Handle the FPSCR.ZE and FPSCR.VE flags with arithmetic instructions

According to PEM 3.3.6.1, if a division by zero occurs and FPSCR.ZE is
set, then the result of the instruction operation is unchanged (see
table 3-13). Similarly, if an invalid operation occurs and FPSCR.VE is
set, then the destination should also remain unchanged (see table 3-12).
Hardware also matches this behavior.

We were handling this for other relevant instructions, but we weren't
doing so for the arithmetic instructions. This corrects that.

This also alters our NI_* functions to return an FPResult type, which
allows us to see which kind of exception in particular is set in
exceptional cases. This is necessary for cases like the fdiv
instructions, which requires handling both ZE and VE being potentially
set.

0 files changed, 0 insertions, 0 deletions