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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/nexgen32e/pcmpstr.inc Normal file
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/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
/ Documentation for Intel(R)'s “Most Complicated Instruction”(TM)
/
/ mnemonic op1 op2 op3 op4 modif f description, notes
/ ═══════════ ════ ════ ════ ═══ ════════ ═════════════════════════════
/ PCMPESTRM XMM0 Vdq Wdq ... o..szapc Explicit Length, Return Mask
/ PCMPESTRI rCX Vdq Wdq ... o..szapc Explicit Length, Return Index
/ PCMPISTRM XMM0 Vdq Wdq Ib o..szapc Implicit Length, Return Mask
/ PCMPISTRI rCX Vdq Wdq Ib o..szapc Implicit Length, Return Index
/
/ CF ← Reset if IntRes2 is equal to zero, set otherwise
/ ZF ← Set if any byte/word of xmm2/mem128 is null, reset otherwise
/ SF ← Set if any byte/word of xmm1 is null, reset otherwise
/ OF ← IntRes2[0]
/ AF ← Reset
/ PF ← Reset
/
/ PCMP{E,I}STR{I,M} Control Byte
/ @see Intel Manual V.2B §4.1.7
/
/ ┌─0:index of the LEAST significant, set, bit is used
/ │ regardless of corresponding input element validity
/ │ intres2 is returned in least significant bits of xmm0
/ ├─1:index of the MOST significant, set, bit is used
/ │ regardless of corresponding input element validity
/ │ each bit of intres2 is expanded to byte/word
/ │┌─0:negation of intres1 is for all 16 (8) bits
/ │├─1:negation of intres1 is masked by reg/mem validity
/ ││┌─intres1 is negated (1’s complement)
/ │││┌─mode{equalany,ranges,equaleach,equalordered}
/ ││││ ┌─issigned
/ ││││ │┌─is16bit
/ u│││├┐││
.Lequalordered = 0b00001100
.Lequalorder16 = 0b00001101
.Lequalranges8 = 0b00000100