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[arm]fix exp's implementation(v_exp_f32) based on neon intrinsics #14

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[arm]fix exp's implementation(v_exp_f32) based on neon intrinsics #14

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[arm]fix exp's implementation(v_exp_f32) based on neon intrinsics
empowerszc Apr 5, 2023
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empowerszc Apr 6, 2023
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16 changes: 8 additions & 8 deletions src/ppl/kernel/arm_server/common/math_neon.h
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,10 @@ inline float32x4_t v_exp_f32(const float32x4_t v_src)
#else
tmp = vrndmq_f32(fx);
#endif
//TODO: compare is right?
uint32x4_t mask = vceqq_f32(tmp, fx);
mask = vandq_u32(mask, vcvtq_u32_f32(one));
fx = vsubq_f32(tmp, vcvtq_f32_u32(mask));

float32x4_t mask = vreinterpretq_f32_u32(vcgtq_f32(tmp, fx));
mask = vreinterpretq_f32_s32(vandq_s32(vreinterpretq_s32_f32(mask), vreinterpretq_s32_f32(one)));
fx = vsubq_f32(tmp, mask);

tmp = vmulq_f32(fx, vdupq_n_f32(0.693359375));
float32x4_t z = vmulq_f32(fx, vdupq_n_f32(-2.12194440e-4));
Expand All @@ -61,10 +61,10 @@ inline float32x4_t v_exp_f32(const float32x4_t v_src)
y = vfma<float32x4_t>(y, z, x);
y = vaddq_f32(y, one);

int32x4_t imm0 = vcvtq_s32_f32(fx);
imm0 = vaddq_s32(imm0, vdupq_n_s32(0x7f));
imm0 = vqrshlq_s32(imm0, vdupq_n_s32(23));
float32x4_t pow2n = vcvtq_f32_s32(imm0);
int64x2_t imm0 = vreinterpretq_s64_s32(vcvtq_s32_f32(fx));
imm0 = vreinterpretq_s64_s32(vaddq_s32(vreinterpretq_s32_s64(imm0), vdupq_n_s32(0x7f)));
imm0 = vreinterpretq_s64_s32(vshlq_s32(vreinterpretq_s32_s64(imm0), vdupq_n_s32(23)));
float32x4_t pow2n = vreinterpretq_f32_s32(vreinterpretq_s32_s64(imm0));
y = vmulq_f32(y, pow2n);

return y;
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