172 lines
6.9 KiB
C
172 lines
6.9 KiB
C
/***************************************************************************
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Copyright (c) 2022, 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 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 OPENBLAS PROJECT 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 "common.h"
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#include <float.h>
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#if defined(DOUBLE)
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#define VSETVL(n) __riscv_vsetvl_e64m4(n)
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#define VSETVL_MAX __riscv_vsetvlmax_e64m4()
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#define FLOAT_V_T vfloat64m4_t
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#define FLOAT_V_T_M1 vfloat64m1_t
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#define FLOAT_VX2_T vfloat64m4x2_t
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#define VGET_VX2 __riscv_vget_v_f64m4x2_f64m4
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#define VLSEG_FLOAT __riscv_vlseg2e64_v_f64m4x2
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#define VLSSEG_FLOAT __riscv_vlsseg2e64_v_f64m4x2
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#define VFREDMINVS_FLOAT __riscv_vfredmin_vs_f64m4_f64m1
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#define MASK_T vbool16_t
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#define VMFLTVF_FLOAT __riscv_vmflt_vf_f64m4_b16
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#define VMFLTVV_FLOAT __riscv_vmflt_vv_f64m4_b16
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#define VMFLEVF_FLOAT __riscv_vmfle_vf_f64m4_b16
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#define VFMVVF_FLOAT __riscv_vfmv_v_f_f64m4
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#define VFMVVF_FLOAT_M1 __riscv_vfmv_v_f_f64m1
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#define VFABSV_FLOAT __riscv_vfabs_v_f64m4
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#define VFMINVV_FLOAT_TU __riscv_vfmin_vv_f64m4_tu
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#define VFADDVV_FLOAT __riscv_vfadd_vv_f64m4
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#define VFIRSTM __riscv_vfirst_m_b16
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#define UINT_V_T vuint64m4_t
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#define VIDV_MASK_UINT_TU __riscv_vid_v_u64m4_tumu
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#define VIDV_UINT __riscv_vid_v_u64m4
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#define VADDVX_MASK_UINT_TU __riscv_vadd_vx_u64m4_tumu
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#define VADDVX_UINT __riscv_vadd_vx_u64m4
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#define VMVVX_UINT __riscv_vmv_v_x_u64m4
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#define VFMVFS_FLOAT_M1 __riscv_vfmv_f_s_f64m1_f64
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#define VSLIDEDOWN_UINT __riscv_vslidedown_vx_u64m4
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#define VMVVXS_UINT __riscv_vmv_x_s_u64m4_u64
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#else
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#define VSETVL(n) __riscv_vsetvl_e32m4(n)
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#define VSETVL_MAX __riscv_vsetvlmax_e32m4()
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#define FLOAT_V_T vfloat32m4_t
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#define FLOAT_V_T_M1 vfloat32m1_t
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#define FLOAT_VX2_T vfloat32m4x2_t
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#define VGET_VX2 __riscv_vget_v_f32m4x2_f32m4
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#define VLSEG_FLOAT __riscv_vlseg2e32_v_f32m4x2
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#define VLSSEG_FLOAT __riscv_vlsseg2e32_v_f32m4x2
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#define VFREDMINVS_FLOAT __riscv_vfredmin_vs_f32m4_f32m1
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#define MASK_T vbool8_t
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#define VMFLTVF_FLOAT __riscv_vmflt_vf_f32m4_b8
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#define VMFLTVV_FLOAT __riscv_vmflt_vv_f32m4_b8
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#define VMFLEVF_FLOAT __riscv_vmfle_vf_f32m4_b8
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#define VFMVVF_FLOAT __riscv_vfmv_v_f_f32m4
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#define VFMVVF_FLOAT_M1 __riscv_vfmv_v_f_f32m1
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#define VFABSV_FLOAT __riscv_vfabs_v_f32m4
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#define VFMINVV_FLOAT_TU __riscv_vfmin_vv_f32m4_tu
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#define VFADDVV_FLOAT __riscv_vfadd_vv_f32m4
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#define VFIRSTM __riscv_vfirst_m_b8
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#define UINT_V_T vuint32m4_t
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#define VIDV_MASK_UINT_TU __riscv_vid_v_u32m4_tumu
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#define VIDV_UINT __riscv_vid_v_u32m4
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#define VADDVX_MASK_UINT_TU __riscv_vadd_vx_u32m4_tumu
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#define VADDVX_UINT __riscv_vadd_vx_u32m4
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#define VMVVX_UINT __riscv_vmv_v_x_u32m4
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#define VFMVFS_FLOAT_M1 __riscv_vfmv_f_s_f32m1_f32
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#define VSLIDEDOWN_UINT __riscv_vslidedown_vx_u32m4
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#define VMVVXS_UINT __riscv_vmv_x_s_u32m4_u32
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#endif
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BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
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{
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unsigned int min_index = 0;
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if (n <= 0 || inc_x <= 0) return(min_index);
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FLOAT_V_T vx0, vx1, v_min;
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FLOAT_VX2_T vxx2;
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UINT_V_T v_min_index;
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MASK_T mask;
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size_t vlmax = VSETVL_MAX;
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v_min_index = VMVVX_UINT(0, vlmax);
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v_min = VFMVVF_FLOAT(FLT_MAX, vlmax);
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BLASLONG j=0;
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FLOAT minf=0.0;
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if(inc_x == 1) {
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for (size_t vl; n > 0; n -= vl, x += vl*2, j += vl) {
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vl = VSETVL(n);
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vxx2 = VLSEG_FLOAT(x, vl);
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vx0 = VGET_VX2(vxx2, 0);
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vx1 = VGET_VX2(vxx2, 1);
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vx0 = VFABSV_FLOAT(vx0, vl);
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vx1 = VFABSV_FLOAT(vx1, vl);
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vx0 = VFADDVV_FLOAT(vx0, vx1, vl);
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// index where element less than v_min
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mask = VMFLTVV_FLOAT(vx0, v_min, vl);
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v_min_index = VIDV_MASK_UINT_TU(mask, v_min_index, vl);
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v_min_index = VADDVX_MASK_UINT_TU(mask, v_min_index, v_min_index, j, vl);
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//update v_min and start_index j
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v_min = VFMINVV_FLOAT_TU(v_min, v_min, vx0, vl);
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}
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} else {
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BLASLONG stride_x = inc_x * sizeof(FLOAT) * 2;
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for (size_t vl; n > 0; n -= vl, x += vl*inc_x*2, j += vl) {
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vl = VSETVL(n);
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vxx2 = VLSSEG_FLOAT(x, stride_x, vl);
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vx0 = VGET_VX2(vxx2, 0);
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vx1 = VGET_VX2(vxx2, 1);
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vx0 = VFABSV_FLOAT(vx0, vl);
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vx1 = VFABSV_FLOAT(vx1, vl);
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vx0 = VFADDVV_FLOAT(vx0, vx1, vl);
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// index where element less than v_min
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mask = VMFLTVV_FLOAT(vx0, v_min, vl);
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v_min_index = VIDV_MASK_UINT_TU(mask, v_min_index, vl);
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v_min_index = VADDVX_MASK_UINT_TU(mask, v_min_index, v_min_index, j, vl);
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//update v_min and start_index j
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v_min = VFMINVV_FLOAT_TU(v_min, v_min, vx0, vl);
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}
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}
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FLOAT_V_T_M1 v_res;
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v_res = VFMVVF_FLOAT_M1(FLT_MAX, vlmax);
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v_res = VFREDMINVS_FLOAT(v_min, v_res, vlmax);
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minf = VFMVFS_FLOAT_M1(v_res);
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mask = VMFLEVF_FLOAT(v_min, minf, vlmax);
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min_index = VFIRSTM(mask, vlmax);
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v_min_index = VSLIDEDOWN_UINT(v_min_index, min_index, vlmax);
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min_index = VMVVXS_UINT(v_min_index);
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return(min_index+1);
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}
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