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lavu/riscv: helper macro for VTYPE encoding

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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.
This commit is contained in:
Rémi Denis-Courmont 2022-10-05 19:12:54 +03:00 committed by Lynne
parent 8009581912
commit f59a767ccd
1 changed files with 75 additions and 0 deletions

75
libavutil/riscv/asm.S

@ -92,3 +92,78 @@
shnadd 3, \rd, \rs1, \rs2
.endm
#endif
/* Convenience macro to load a Vector type (vtype) as immediate */
.macro lvtypei rd, e, m=m1, tp=tu, mp=mu
.ifc \e,e8
.equ ei, 0
.else
.ifc \e,e16
.equ ei, 8
.else
.ifc \e,e32
.equ ei, 16
.else
.ifc \e,e64
.equ ei, 24
.else
.error "Unknown element type"
.endif
.endif
.endif
.endif
.ifc \m,m1
.equ mi, 0
.else
.ifc \m,m2
.equ mi, 1
.else
.ifc \m,m4
.equ mi, 2
.else
.ifc \m,m8
.equ mi, 3
.else
.ifc \m,mf8
.equ mi, 5
.else
.ifc \m,mf4
.equ mi, 6
.else
.ifc \m,mf2
.equ mi, 7
.else
.error "Unknown multiplier"
.equ mi, 3
.endif
.endif
.endif
.endif
.endif
.endif
.endif
.ifc \tp,tu
.equ tpi, 0
.else
.ifc \tp,ta
.equ tpi, 64
.else
.error "Unknown tail policy"
.endif
.endif
.ifc \mp,mu
.equ mpi, 0
.else
.ifc \mp,ma
.equ mpi, 128
.else
.error "Unknown mask policy"
.endif
.endif
li \rd, (ei | mi | tpi | mpi)
.endm