76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*****************************************************************************
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Copyright (c) 2024, The OpenBLAS Project
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. Neither the name of the OpenBLAS project nor the names of
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its contributors may be used to endorse or promote products
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derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**********************************************************************************/
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#include <stdint.h>
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#ifdef __riscv_v_intrinsic
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#include <riscv_vector.h>
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#endif
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unsigned detect_riscv64_get_vlenb(void) {
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#ifdef __riscv_v_intrinsic
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return __riscv_vlenb();
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#else
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return 0;
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#endif
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}
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/*
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* Based on the approach taken here:
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* https://code.videolan.org/videolan/dav1d/-/merge_requests/1629
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*
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* Only to be called after we've determined we have some sort of
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* RVV support.
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*/
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uint64_t detect_riscv64_rvv100(void)
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{
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uint64_t rvv10_supported;
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/*
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* After the vsetvli statement vtype will either be a value > 0 if the
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* vsetvli succeeded or less than 0 if it failed. If 0 < vtype
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* we're good and the function will return 1, otherwise there's no
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* RVV 1.0 and we return 0.
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*/
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asm volatile("vsetvli x0, x0, e8, m1, ta, ma\n\t"
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"csrr %0, vtype\n\t"
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"slt %0, x0, %0\n"
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: "=r" (rvv10_supported)
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:
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:);
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return rvv10_supported;
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}
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