diff options
Diffstat (limited to 'sysdeps/aarch64/fpu/tanf_advsimd.c')
| -rw-r--r-- | sysdeps/aarch64/fpu/tanf_advsimd.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/sysdeps/aarch64/fpu/tanf_advsimd.c b/sysdeps/aarch64/fpu/tanf_advsimd.c index 1f16103f8a..5a7489390a 100644 --- a/sysdeps/aarch64/fpu/tanf_advsimd.c +++ b/sysdeps/aarch64/fpu/tanf_advsimd.c @@ -23,7 +23,8 @@ static const struct data { float32x4_t poly[6]; - float32x4_t neg_half_pi_1, neg_half_pi_2, neg_half_pi_3, two_over_pi, shift; + float32x4_t pi_consts; + float32x4_t shift; #if !WANT_SIMD_EXCEPT float32x4_t range_val; #endif @@ -31,10 +32,9 @@ static const struct data /* Coefficients generated using FPMinimax. */ .poly = { V4 (0x1.55555p-2f), V4 (0x1.11166p-3f), V4 (0x1.b88a78p-5f), V4 (0x1.7b5756p-6f), V4 (0x1.4ef4cep-8f), V4 (0x1.0e1e74p-7f) }, - .neg_half_pi_1 = V4 (-0x1.921fb6p+0f), - .neg_half_pi_2 = V4 (0x1.777a5cp-25f), - .neg_half_pi_3 = V4 (0x1.ee59dap-50f), - .two_over_pi = V4 (0x1.45f306p-1f), + /* Stores constants: (-pi/2)_high, (-pi/2)_mid, (-pi/2)_low, and 2/pi. */ + .pi_consts + = { -0x1.921fb6p+0f, 0x1.777a5cp-25f, 0x1.ee59dap-50f, 0x1.45f306p-1f }, .shift = V4 (0x1.8p+23f), #if !WANT_SIMD_EXCEPT .range_val = V4 (0x1p15f), @@ -58,10 +58,11 @@ eval_poly (float32x4_t z, const struct data *d) { float32x4_t z2 = vmulq_f32 (z, z); #if WANT_SIMD_EXCEPT - /* Tiny z (<= 0x1p-31) will underflow when calculating z^4. If fp exceptions - are to be triggered correctly, sidestep this by fixing such lanes to 0. */ + /* Tiny z (<= 0x1p-31) will underflow when calculating z^4. + If fp exceptions are to be triggered correctly, + sidestep this by fixing such lanes to 0. */ uint32x4_t will_uflow - = vcleq_u32 (vreinterpretq_u32_f32 (vabsq_f32 (z)), TinyBound); + = vcleq_u32 (vreinterpretq_u32_f32 (vabsq_f32 (z)), TinyBound); if (__glibc_unlikely (v_any_u32 (will_uflow))) z2 = vbslq_f32 (will_uflow, v_f32 (0), z2); #endif @@ -94,16 +95,16 @@ float32x4_t VPCS_ATTR NOINLINE V_NAME_F1 (tan) (float32x4_t x) #endif /* n = rint(x/(pi/2)). */ - float32x4_t q = vfmaq_f32 (d->shift, d->two_over_pi, x); + float32x4_t q = vfmaq_laneq_f32 (d->shift, x, d->pi_consts, 3); float32x4_t n = vsubq_f32 (q, d->shift); /* Determine if x lives in an interval, where |tan(x)| grows to infinity. */ uint32x4_t pred_alt = vtstq_u32 (vreinterpretq_u32_f32 (q), v_u32 (1)); /* r = x - n * (pi/2) (range reduction into -pi./4 .. pi/4). */ float32x4_t r; - r = vfmaq_f32 (x, d->neg_half_pi_1, n); - r = vfmaq_f32 (r, d->neg_half_pi_2, n); - r = vfmaq_f32 (r, d->neg_half_pi_3, n); + r = vfmaq_laneq_f32 (x, n, d->pi_consts, 0); + r = vfmaq_laneq_f32 (r, n, d->pi_consts, 1); + r = vfmaq_laneq_f32 (r, n, d->pi_consts, 2); /* If x lives in an interval, where |tan(x)| - is finite, then use a polynomial approximation of the form |