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Integer Overflow/Saturation Operations

CDS <cohen.steed@...>
 

Vector-widening multiply & accumulate instructions:

  • These instructions, signed or unsigned, will quickly overflow in even simple cases.
  • Given absence of flagging (e.g. OVERFLOW), a saturating version of these instructions would prevent users from making unintentional errors.
  • The current specification leaves the user doing clunky processing to check for overflow after every iteration in a loop.

How else could these instructions be used practically? What is the expectation for utility when the operations overflow quickly?
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