3 * FP32 is converted to FP64. Requires SV to be active.
5 * FCVT between 16/32/64 needed
6 * c++11 atomics not very efficient
7 * no 16/48/64 opcodes, needs a shuffle of opcodes
8 * needs escape sequencing (ISAMUX/NS)
12 Single instruction on RV, and x86, but multiple on Power. Needs investigation, particularly as to why cache flush exists.
16 Doesn't exist in Power, need to work out suitable opcodes, basically means duplicating the entire range of FP32/64 ops, symmetrically.
18 Usually done with a fmt field, 2 bit, last one is FP128
22 Absolutely critical, also to have official endorsement from OpenPower Foundation.
24 # Compressed, 48, 64, VBLOCK
26 Under Esc Seq, move mulli, twi, tdi out of major OP000 then use the entire row, 2 bits instead of 3.
28 * OP 000-000 and 000-001 for 16 bit compressed, 11 bit instructions
29 * OP 000-010 and 000-011 for 48 bit. 11 bits for SVP P48
30 * OP 000-100 and 000-201 for 64 bit. 11 bits for SVP P64
31 * OP 000-110 and 000-111 for VBLOCK. 11 bits available.
35 Only 11 bits. Idea: have "pages" where one instruction selects the page number. It also specifies for how long that page is activated (terminated on a branch)
37 The length to be a maximum of 4 bits, where 0b1111 indicates "permanently active".
39 Perhaps split OP000-000 and OP000-001 so that 2 pages can be active.
41 Store activation length in a CSR.