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AVX512_ROUND()::
LLRC=0b00 | ROUNDC=1 SAE=1
LLRC=0b01 | ROUNDC=2 SAE=1
LLRC=0b10 | ROUNDC=3 SAE=1
LLRC=0b11 | ROUNDC=4 SAE=1

SAE()::
BCRC=1 | SAE=1
BCRC=0 | error

# NEWKEY: VEXPFX_OP == 0x62
# NEWKEY: MBITS --> REXR, REXX (complemented MBITS)
# NEWKEY: BRR -> REXB, REXRR (complemented BRR bits)
# NEWKEY: EVMAP -> V0F, V0F38, V0F3A or error
# NEWKEY: REXW
# NEWKEY: VEXDEST3
# NEWKEY: VEXDEST210
# NEWKEY: UBIT
# NEWKEY: VEXPP_OP -> VNP/V66/VF3/VF2 recoding
# NEWKEY: confirm no refining prefix or rex prefix
# NEWKEY: set VEXVALID=2
# NEWKEY: ZEROING[z]  
# NEWKEY: LLRCDECODE()-> LLRC -> VL128,256,512 or error
# NEWKEY: BCRC[b] 
# NEWKEY: VEXDEST4P[p]  
# NEWKEY: VEXDEST4_INVERT()  <<<< invert VEXDEST4
# NEWKEY: MASK[aaa]

