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f59a767ccd
On most cases, the vector type (VTYPE) for the RISC-V Vector extension is supplied as an immediate value, with either of the VSETVLI or VSETIVLI instructions. There is however a third instruction VSETVL which takes the vector type from a general purpose register. That is so the type can be selected at run-time. This introduces a macro to load a (valid) vector type into a register. The syntax follows that of VSETVLI and VSETIVLI, with element size, group multiplier, then tail and mask policies.
170 lines
3.7 KiB
ArmAsm
170 lines
3.7 KiB
ArmAsm
/*
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* Copyright © 2022 Rémi Denis-Courmont.
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* Loosely based on earlier work copyrighted by Måns Rullgård, 2008.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if defined (__riscv_float_abi_soft)
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#define NOHWF
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#define NOHWD
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#define HWF #
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#define HWD #
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#elif defined (__riscv_float_abi_single)
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#define NOHWF #
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#define NOHWD
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#define HWF
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#define HWD #
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#else
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#define NOHWF #
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#define NOHWD #
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#define HWF
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#define HWD
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#endif
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.macro func sym, ext=
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.text
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.align 2
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.option push
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.ifnb \ext
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.option arch, +\ext
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.endif
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.global \sym
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.hidden \sym
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.type \sym, %function
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\sym:
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.macro endfunc
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.size \sym, . - \sym
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.option pop
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.previous
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.purgem endfunc
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.endm
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.endm
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.macro const sym, align=3, relocate=0
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.if \relocate
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.pushsection .data.rel.ro
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.else
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.pushsection .rodata
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.endif
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.align \align
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\sym:
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.macro endconst
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.size \sym, . - \sym
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.popsection
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.purgem endconst
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.endm
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.endm
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#if !defined (__riscv_zba)
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/* SH{1,2,3}ADD definitions for pre-Zba assemblers */
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.macro shnadd n, rd, rs1, rs2
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.insn r OP, 2 * \n, 16, \rd, \rs1, \rs2
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.endm
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.macro sh1add rd, rs1, rs2
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shnadd 1, \rd, \rs1, \rs2
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.endm
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.macro sh2add rd, rs1, rs2
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shnadd 2, \rd, \rs1, \rs2
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.endm
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.macro sh3add rd, rs1, rs2
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shnadd 3, \rd, \rs1, \rs2
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.endm
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#endif
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/* Convenience macro to load a Vector type (vtype) as immediate */
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.macro lvtypei rd, e, m=m1, tp=tu, mp=mu
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.ifc \e,e8
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.equ ei, 0
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.else
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.ifc \e,e16
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.equ ei, 8
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.else
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.ifc \e,e32
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.equ ei, 16
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.else
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.ifc \e,e64
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.equ ei, 24
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.else
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.error "Unknown element type"
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.endif
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.endif
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.endif
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.endif
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.ifc \m,m1
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.equ mi, 0
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.else
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.ifc \m,m2
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.equ mi, 1
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.else
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.ifc \m,m4
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.equ mi, 2
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.else
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.ifc \m,m8
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.equ mi, 3
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.else
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.ifc \m,mf8
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.equ mi, 5
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.else
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.ifc \m,mf4
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.equ mi, 6
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.else
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.ifc \m,mf2
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.equ mi, 7
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.else
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.error "Unknown multiplier"
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.equ mi, 3
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.endif
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.endif
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.endif
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.endif
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.endif
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.endif
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.endif
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.ifc \tp,tu
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.equ tpi, 0
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.else
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.ifc \tp,ta
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.equ tpi, 64
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.else
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.error "Unknown tail policy"
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.endif
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.endif
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.ifc \mp,mu
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.equ mpi, 0
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.else
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.ifc \mp,ma
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.equ mpi, 128
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.else
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.error "Unknown mask policy"
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.endif
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.endif
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li \rd, (ei | mi | tpi | mpi)
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.endm
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