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49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* Single-precision vector (SVE) hypot function
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include "sv_math.h"
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#define TinyBound 0x0c800000 /* asuint (0x1p-102). */
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#define Thres 0x73000000 /* 0x70000000 - TinyBound. */
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static svfloat32_t NOINLINE
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special_case (svfloat32_t sqsum, svfloat32_t x, svfloat32_t y, svbool_t pg,
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svbool_t special)
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{
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return sv_call2_f32 (hypotf, x, y, svsqrt_x (pg, sqsum), special);
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}
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/* SVE implementation of single-precision hypot.
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Maximum error observed is 1.21 ULP:
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_ZGVsMxvv_hypotf (0x1.6a213cp-19, -0x1.32b982p-26) got 0x1.6a2346p-19
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want 0x1.6a2344p-19. */
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svfloat32_t SV_NAME_F2 (hypot) (svfloat32_t x, svfloat32_t y,
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const svbool_t pg)
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{
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svfloat32_t sqsum = svmla_x (pg, svmul_x (pg, x, x), y, y);
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svbool_t special = svcmpge (
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pg, svsub_x (pg, svreinterpret_u32 (sqsum), TinyBound), Thres);
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if (__glibc_unlikely (svptest_any (pg, special)))
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return special_case (sqsum, x, y, pg, special);
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return svsqrt_x (pg, sqsum);
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}
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