• bill_ofarrell's avatar
    cmd/asm: add s390x VMSLG instruction variants · 3f3142ad
    bill_ofarrell authored
    VMSLG has three variants on z14 and later machines. These variants are used in "limbified" squaring:
    VMSLEG: Even Shift Indication -- the even-indexed intermediate result is doubled
    VMSLOG: Odd Shift Indication -- the odd-indexed intermediate result is doubled
    VMSLEOG: Even and Odd Shift Indication -- both intermediate results are doubled
    Limbified squaring is very useful for high performance cryptographic algorithms, such as
    elliptic curve. This change allows these instructions to be used in Go assembly.
    
    Change-Id: Iaad577b07320205539f99b3cb37a2a984882721b
    Reviewed-on: https://go-review.googlesource.com/c/145180Reviewed-by: 's avatarMichael Munday <mike.munday@ibm.com>
    3f3142ad
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