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/* RISC-V 'V' Extension intrinsics include file.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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; either version 3, or (at your
option) any later version.
GCC 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef __RISCV_VECTOR_H
#define __RISCV_VECTOR_H
#include <stdint.h>
#include <stddef.h>
#ifndef __riscv_vector
#error "Vector intrinsics require the vector extension."
#else
#ifdef __cplusplus
extern "C" {
#endif
enum RVV_CSR {
RVV_VSTART = 0,
RVV_VXSAT,
RVV_VXRM,
RVV_VCSR,
};
__extension__ extern __inline unsigned long
__attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
vread_csr(enum RVV_CSR csr)
{
unsigned long rv = 0;
switch (csr)
{
case RVV_VSTART:
__asm__ __volatile__ ("csrr\t%0,vstart" : "=r"(rv) : : "memory");
break;
case RVV_VXSAT:
__asm__ __volatile__ ("csrr\t%0,vxsat" : "=r"(rv) : : "memory");
break;
case RVV_VXRM:
__asm__ __volatile__ ("csrr\t%0,vxrm" : "=r"(rv) : : "memory");
break;
case RVV_VCSR:
__asm__ __volatile__ ("csrr\t%0,vcsr" : "=r"(rv) : : "memory");
break;
}
return rv;
}
__extension__ extern __inline void
__attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
vwrite_csr(enum RVV_CSR csr, unsigned long value)
{
switch (csr)
{
case RVV_VSTART:
__asm__ __volatile__ ("csrw\tvstart,%z0" : : "rJ"(value) : "memory");
break;
case RVV_VXSAT:
__asm__ __volatile__ ("csrw\tvxsat,%z0" : : "rJ"(value) : "memory");
break;
case RVV_VXRM:
__asm__ __volatile__ ("csrw\tvxrm,%z0" : : "rJ"(value) : "memory");
break;
case RVV_VCSR:
__asm__ __volatile__ ("csrw\tvcsr,%z0" : : "rJ"(value) : "memory");
break;
}
}
/* NOTE: This implementation of riscv_vector.h is intentionally short. It does
not define the RVV types and intrinsic functions directly in C and C++
code, but instead uses the following pragma to tell GCC to insert the
necessary type and function definitions itself. The net effect is the
same, and the file is a complete implementation of riscv_vector.h. */
#pragma riscv intrinsic "vector"
#ifdef __cplusplus
}
#endif // __cplusplus
#endif // __riscv_vector
#endif // __RISCV_VECTOR_H
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