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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
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* Copyright 2024 Google LLC
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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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///////////////////////////////////////
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// Implements:
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// double floor(double x);
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#include <pblibc_private.h>
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#include <math.h>
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#include <stdbool.h>
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#include <stdint.h>
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// TODO: PBL-36144 replace this naive implementation with __builtin_floor()
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#ifndef NAN
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#define NAN (0.0/0.0)
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#endif
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#ifndef INFINITY
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#define INFINITY (1.0/0.0)
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#endif
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#ifndef isinf
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#define isinf(y) (__builtin_isinf(y))
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#endif
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#ifndef isnan
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#define isnan(y) (__builtin_isnan(y))
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#endif
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double floor(double x) {
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if (isnan(x)) {
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return NAN;
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}
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if (isinf(x)) {
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return INFINITY;
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}
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const int64_t x_int = (int64_t)x;
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const bool has_no_fraction = (double)x_int == x;
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return (double)((x >= 0 || has_no_fraction) ? x_int : x_int - 1);
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}
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