diff options
Diffstat (limited to 'pl/math/v_sinhf_2u3.c')
| -rw-r--r-- | pl/math/v_sinhf_2u3.c | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/pl/math/v_sinhf_2u3.c b/pl/math/v_sinhf_2u3.c index ce2fe0e..a54c178 100644 --- a/pl/math/v_sinhf_2u3.c +++ b/pl/math/v_sinhf_2u3.c @@ -5,17 +5,25 @@ */ #include "v_math.h" -#include "mathlib.h" #include "pl_sig.h" #include "pl_test.h" #if V_SUPPORTED +#include "v_expm1f_inline.h" + #define AbsMask 0x7fffffff #define Half 0x3f000000 -#define Expm1OFlowLimit \ - 0x42b17218 /* 0x1.62e43p+6, 2^7*ln2, minimum value for which expm1f \ - overflows. */ +#define BigBound \ + 0x42b0c0a7 /* 0x1.61814ep+6, above which expm1f helper overflows. */ +#define TinyBound \ + 0x2fb504f4 /* 0x1.6a09e8p-32, below which expm1f underflows. */ + +static NOINLINE VPCS_ATTR v_f32_t +special_case (v_f32_t x) +{ + return v_call_f32 (sinhf, x, x, v_u32 (-1)); +} /* Approximation for vector single-precision sinh(x) using expm1. sinh(x) = (exp(x) - exp(-x)) / 2. @@ -29,28 +37,32 @@ VPCS_ATTR v_f32_t V_NAME (sinhf) (v_f32_t x) v_u32_t sign = ix & ~AbsMask; v_f32_t halfsign = v_as_f32_u32 (sign | Half); - v_u32_t special = v_cond_u32 (iax >= Expm1OFlowLimit); +#if WANT_SIMD_EXCEPT + v_u32_t special = v_cond_u32 ((iax - TinyBound) >= (BigBound - TinyBound)); +#else + v_u32_t special = v_cond_u32 (iax >= BigBound); +#endif + /* Fall back to the scalar variant for all lanes if any of them should trigger an exception. */ if (unlikely (v_any_u32 (special))) - return v_call_f32 (sinhf, x, x, v_u32 (-1)); + return special_case (x); /* Up to the point that expm1f overflows, we can use it to calculate sinhf using a slight rearrangement of the definition of asinh. This allows us to retain acceptable accuracy for very small inputs. */ - v_f32_t t = V_NAME (expm1f) (ax); + v_f32_t t = expm1f_inline (ax); return (t + t / (t + 1)) * halfsign; } VPCS_ALIAS PL_SIG (V, F, 1, sinh, -10.0, 10.0) PL_TEST_ULP (V_NAME (sinhf), 1.76) -/* TODO: reinstate PL_TEST_EXPECT_FENV here once fp exceptions are triggered - correctly. */ -PL_TEST_INTERVAL (V_NAME (sinhf), 0, 0x1.62e43p+6, 100000) -PL_TEST_INTERVAL (V_NAME (sinhf), -0, -0x1.62e43p+6, 100000) -PL_TEST_INTERVAL (V_NAME (sinhf), 0x1.62e43p+6, 0x1.65a9fap+6, 100) -PL_TEST_INTERVAL (V_NAME (sinhf), -0x1.62e43p+6, -0x1.65a9fap+6, 100) -PL_TEST_INTERVAL (V_NAME (sinhf), 0x1.65a9fap+6, inf, 100) -PL_TEST_INTERVAL (V_NAME (sinhf), -0x1.65a9fap+6, -inf, 100) +PL_TEST_EXPECT_FENV (V_NAME (sinhf), WANT_SIMD_EXCEPT) +PL_TEST_INTERVAL (V_NAME (sinhf), 0, TinyBound, 1000) +PL_TEST_INTERVAL (V_NAME (sinhf), -0, -TinyBound, 1000) +PL_TEST_INTERVAL (V_NAME (sinhf), TinyBound, BigBound, 100000) +PL_TEST_INTERVAL (V_NAME (sinhf), -TinyBound, -BigBound, 100000) +PL_TEST_INTERVAL (V_NAME (sinhf), BigBound, inf, 1000) +PL_TEST_INTERVAL (V_NAME (sinhf), -BigBound, -inf, 1000) #endif |