derek.holloway
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45 lines
1.5 KiB
Common Lisp
45 lines
1.5 KiB
Common Lisp
/*===--------------------------------------------------------------------------
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* ROCm Device Libraries
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*
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* This file is distributed under the University of Illinois Open Source
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* License. See LICENSE.TXT for details.
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*===------------------------------------------------------------------------*/
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#include "mathF.h"
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float
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MATH_MANGLE(i0)(float x)
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{
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x = BUILTIN_ABS_F32(x);
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float ret;
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if (x < 8.0f) {
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float t = 0.25f * x * x;
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ret = MATH_MAD(t, MATH_MAD(t, MATH_MAD(t, MATH_MAD(t,
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MATH_MAD(t, MATH_MAD(t, MATH_MAD(t, MATH_MAD(t,
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MATH_MAD(t,
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0x1.38d760p-43f, 0x1.7fd5c6p-38f), 0x1.66ffc8p-31f), 0x1.4ecb6ep-25f),
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0x1.033c70p-19f), 0x1.233bb2p-14f), 0x1.c71db2p-10f), 0x1.c71c5ep-6f),
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0x1.000000p-2f), 0x1.000000p+0f);
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ret = MATH_MAD(t, ret, 1.0f);
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} else {
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float t = MATH_FAST_RCP(x);
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ret = MATH_MAD(t, MATH_MAD(t, MATH_MAD(t, MATH_MAD(t,
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MATH_MAD(t,
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0x1.c49916p-2f, -0x1.110f5ep-5f), 0x1.2a130ap-5f), 0x1.c68702p-6f),
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0x1.9890aep-5f), 0x1.988450p-2f);
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float xs = x - 88.0f;
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float e1 = MATH_MANGLE(exp)(x > 88.0f ? xs : x);
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float e2 = x > 88.0f ? 0x1.f1056ep+126f : 1.0f;
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ret = e1 * BUILTIN_AMDGPU_RSQRT_F32(x) * ret * e2;
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}
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if (!FINITE_ONLY_OPT()) {
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ret = BUILTIN_CLASS_F32(x, CLASS_PINF|CLASS_QNAN|CLASS_SNAN) ? x : ret;
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}
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return ret;
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}
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