On 3/18/25 10:23 AM, Luis Silva wrote:
This patch handles both signed and unsigned
builtin multiplication overflow.
Uses the "mpy.f" instruction to set the condition
codes based on the result. In the event of an
overflow, the V flag is set, triggering a
conditional move depending on the V flag status.
For example, set "1" to "r0" in case of overflow:
mov_s r0,1
mpy.f r0,r0,r1
j_s.d [blink]
mov.nv r0,0
gcc/ChangeLog:
* config/arc/arc.md (<su_optab>mulvsi4): New define_expand.
(<su_optab>mulsi3_Vcmp): New define_insn.
So similar to your other patch, there are other attributes (cond and
predicable) that you may need to set. I just don't know the port well
enough to judge that.
jeff
