74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2020 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "stdlib/blas/ext/base/sfill.h"
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#include <stdint.h>
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/**
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* Fills a single-precision floating-point strided array with a specified scalar constant.
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*
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* @param N number of indexed elements
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* @param alpha scalar
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* @param X input array
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* @param stride index increment
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*/
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void c_sfill( const int64_t N, const float alpha, float *X, const int64_t stride ) {
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int64_t ix;
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int64_t m;
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int64_t i;
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if ( N <= 0 ) {
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return;
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}
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// Use loop unrolling if the stride is equal to `1`...
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if ( stride == 1 ) {
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m = N % 8;
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// If we have a remainder, run a clean-up loop...
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if ( m > 0 ) {
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for ( i = 0; i < m; i++ ) {
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X[ i ] = alpha;
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}
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}
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if ( N < 8 ) {
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return;
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}
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for ( i = m; i < N; i += 8 ) {
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X[ i ] = alpha;
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X[ i+1 ] = alpha;
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X[ i+2 ] = alpha;
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X[ i+3 ] = alpha;
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X[ i+4 ] = alpha;
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X[ i+5 ] = alpha;
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X[ i+6 ] = alpha;
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X[ i+7 ] = alpha;
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}
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return;
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}
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if ( stride < 0 ) {
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ix = (1-N) * stride;
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} else {
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ix = 0;
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}
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for ( i = 0; i < N; i++ ) {
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X[ ix ] = alpha;
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ix += stride;
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}
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return;
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}
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