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Diffstat (limited to 'pl/math/sv_log2_3u.c')
| -rw-r--r-- | pl/math/sv_log2_3u.c | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/pl/math/sv_log2_3u.c b/pl/math/sv_log2_3u.c deleted file mode 100644 index 0775a39cc85d..000000000000 --- a/pl/math/sv_log2_3u.c +++ /dev/null @@ -1,73 +0,0 @@ -/* - * Double-precision SVE log2 function. - * - * Copyright (c) 2022-2023, Arm Limited. - * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception - */ - -#include "sv_math.h" -#include "pl_sig.h" -#include "pl_test.h" -#include "poly_sve_f64.h" - -#define N (1 << V_LOG2_TABLE_BITS) -#define Off 0x3fe6900900000000 -#define Max (0x7ff0000000000000) -#define Min (0x0010000000000000) -#define Thresh (0x7fe0000000000000) /* Max - Min. */ - -static svfloat64_t NOINLINE -special_case (svfloat64_t x, svfloat64_t y, svbool_t cmp) -{ - return sv_call_f64 (log2, x, y, cmp); -} - -/* Double-precision SVE log2 routine. - Implements the same algorithm as AdvSIMD log10, with coefficients and table - entries scaled in extended precision. - The maximum observed error is 2.58 ULP: - SV_NAME_D1 (log2)(0x1.0b556b093869bp+0) got 0x1.fffb34198d9dap-5 - want 0x1.fffb34198d9ddp-5. */ -svfloat64_t SV_NAME_D1 (log2) (svfloat64_t x, const svbool_t pg) -{ - svuint64_t ix = svreinterpret_u64 (x); - svbool_t special = svcmpge (pg, svsub_x (pg, ix, Min), Thresh); - - /* x = 2^k z; where z is in range [Off,2*Off) and exact. - The range is split into N subintervals. - The ith subinterval contains z and c is near its center. */ - svuint64_t tmp = svsub_x (pg, ix, Off); - svuint64_t i = svlsr_x (pg, tmp, 51 - V_LOG2_TABLE_BITS); - i = svand_x (pg, i, (N - 1) << 1); - svfloat64_t k = svcvt_f64_x (pg, svasr_x (pg, svreinterpret_s64 (tmp), 52)); - svfloat64_t z = svreinterpret_f64 ( - svsub_x (pg, ix, svand_x (pg, tmp, 0xfffULL << 52))); - - svfloat64_t invc = svld1_gather_index (pg, &__v_log2_data.table[0].invc, i); - svfloat64_t log2c - = svld1_gather_index (pg, &__v_log2_data.table[0].log2c, i); - - /* log2(x) = log1p(z/c-1)/log(2) + log2(c) + k. */ - - svfloat64_t r = svmad_x (pg, invc, z, -1.0); - svfloat64_t w = svmla_x (pg, log2c, r, __v_log2_data.invln2); - - svfloat64_t r2 = svmul_x (pg, r, r); - svfloat64_t y = sv_pw_horner_4_f64_x (pg, r, r2, __v_log2_data.poly); - w = svadd_x (pg, k, w); - - if (unlikely (svptest_any (pg, special))) - return special_case (x, svmla_x (svnot_z (pg, special), w, r2, y), - special); - return svmla_x (pg, w, r2, y); -} - -PL_SIG (SV, D, 1, log2, 0.01, 11.1) -PL_TEST_ULP (SV_NAME_D1 (log2), 2.09) -PL_TEST_EXPECT_FENV_ALWAYS (SV_NAME_D1 (log2)) -PL_TEST_INTERVAL (SV_NAME_D1 (log2), -0.0, -0x1p126, 1000) -PL_TEST_INTERVAL (SV_NAME_D1 (log2), 0.0, 0x1p-126, 4000) -PL_TEST_INTERVAL (SV_NAME_D1 (log2), 0x1p-126, 0x1p-23, 50000) -PL_TEST_INTERVAL (SV_NAME_D1 (log2), 0x1p-23, 1.0, 50000) -PL_TEST_INTERVAL (SV_NAME_D1 (log2), 1.0, 100, 50000) -PL_TEST_INTERVAL (SV_NAME_D1 (log2), 100, inf, 50000) |
