From: lkcl Date: Thu, 1 Jul 2021 00:55:05 +0000 (+0100) Subject: (no commit message) X-Git-Tag: DRAFT_SVP64_0_1~682 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=de7389cf35e0fccf8b328148ffdbb4af8c79b6cb;p=libreriscv.git --- diff --git a/openpower/sv/register_type_tags.mdwn b/openpower/sv/register_type_tags.mdwn index f5ca7a3c9..de2d79591 100644 --- a/openpower/sv/register_type_tags.mdwn +++ b/openpower/sv/register_type_tags.mdwn @@ -4,8 +4,12 @@ A concept present in processors such as Texas Instruments DSPs and in the Mill Architecture to an advanced level, register "tags" allow the meaning and behaviour of instructions to change, polymorphically. -This allows instructions originally designed to only be IEEE754 FP64 fir example to become IEEE754 FP128 or even complex mumbers. With SVP64 supporting [[sv/remap]] it is not conceptually that much of a leap to support complex numbers, given that the hardware to do so is already in place. +This for allows instructions originally designed to only be IEEE754 FP64 fir example to become IEEE754 FP128 or even complex mumbers. With SVP64 supporting [[sv/remap]] it is not conceptually that much of a leap to support complex numbers, given that the hardware to do so is already in place. Links: * + +# Complex numbers + +Currently under discussion is which arithmetic operations should be supported: complex divide for example is known to be very tricky. Add and subtract are easy: multiply involves four scalar multiplies, one add and one subtract. This fits within the REMAP system capabilities.