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100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
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/*******************************************************************************
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MIT License
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-----------
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Copyright (c) 2002-2019 Advanced Micro Devices, Inc.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this Software and associated documentaon files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*******************************************************************************/
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#include "libm.h"
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#include "libm_util.h"
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#ifdef USE_SOFTWARE_SQRT
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#define USE_SQRTF_AMD_INLINE
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#endif
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#define USE_INFINITYF_WITH_FLAGS
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#define USE_HANDLE_ERRORF
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#include "libm_inlines.h"
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#ifdef USE_SOFTWARE_SQRT
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#undef USE_SQRTF_AMD_INLINE
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#endif
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#undef USE_INFINITYF_WITH_FLAGS
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#undef USE_HANDLE_ERRORF
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#include "libm_errno.h"
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float FN_PROTOTYPE(_hypotf)(float x, float y)
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{
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/* Returns sqrt(x*x + y*y) with no overflow or underflow unless
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the result warrants it */
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/* Do intermediate computations in double precision
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and use sqrt instruction from chip if available. */
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double dx = x, dy = y, dr, retval;
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/* The largest finite float, stored as a double */
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const double large = 3.40282346638528859812e+38; /* 0x47efffffe0000000 */
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unsigned long ux, uy, avx, avy;
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GET_BITS_DP64(x, avx);
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avx &= ~SIGNBIT_DP64;
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GET_BITS_DP64(y, avy);
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avy &= ~SIGNBIT_DP64;
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ux = (avx >> EXPSHIFTBITS_DP64);
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uy = (avy >> EXPSHIFTBITS_DP64);
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if (ux == BIASEDEMAX_DP64 + 1 || uy == BIASEDEMAX_DP64 + 1)
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{
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retval = x*x + y*y;
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/* One or both of the arguments are NaN or infinity. The
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result will also be NaN or infinity. */
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if (((ux == BIASEDEMAX_DP64 + 1) && !(avx & MANTBITS_DP64)) ||
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((uy == BIASEDEMAX_DP64 + 1) && !(avy & MANTBITS_DP64)))
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/* x or y is infinity. ISO C99 defines that we must
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return +infinity, even if the other argument is NaN.
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Note that the computation of x*x + y*y above will already
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have raised invalid if either x or y is a signalling NaN. */
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return infinityf_with_flags(0);
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else
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/* One or both of x or y is NaN, and neither is infinity.
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Raise invalid if it's a signalling NaN */
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return (float)retval;
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}
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dr = (dx*dx + dy*dy);
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#if USE_SOFTWARE_SQRT
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retval = sqrtf_amd_inline(r);
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#else
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/* VC++ intrinsic call */
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_mm_store_sd(&retval, _mm_sqrt_sd(_mm_setzero_pd(), _mm_load_sd(&dr)));
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#endif
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if (retval > large)
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return _handle_errorf("_hypotf", OP_HYPOT, PINFBITPATT_SP32, _OVERFLOW,
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AMD_F_OVERFLOW | AMD_F_INEXACT, ERANGE, x, y, 2);
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else
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return (float)retval;
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}
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