Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Use union to bitcast int to float #275

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Use union to bitcast int to float #275

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 6 additions & 6 deletions encoder/cppspmd_sse.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -186,6 +186,8 @@ CPPSPMD_FORCE_INLINE __m128i blendv_epi32(__m128i a, __m128i b, __m128i mask)
return _mm_castps_si128(blendv_ps(_mm_castsi128_ps(a), _mm_castsi128_ps(b), _mm_castsi128_ps(mask)));
}

CPPSPMD_FORCE_INLINE float cast_int_bits_as_float(int v) { union { int32_t i; float f; } u = { v }; return u.f; }

#if CPPSPMD_SSE2
CPPSPMD_FORCE_INLINE int extract_x(const __m128i& vec) { return _mm_cvtsi128_si32(vec); }
CPPSPMD_FORCE_INLINE int extract_y(const __m128i& vec) { return _mm_cvtsi128_si32(_mm_shuffle_epi32(vec, 0x55)); }
Expand Down Expand Up @@ -216,10 +218,10 @@ CPPSPMD_FORCE_INLINE int extract_ps_z(const __m128& vec) { return _mm_extract_ps
CPPSPMD_FORCE_INLINE int extract_ps_w(const __m128& vec) { return _mm_extract_ps(vec, 3); }

// Returns floats
CPPSPMD_FORCE_INLINE float extractf_ps_x(const __m128& vec) { int v = extract_ps_x(vec); return *(const float*)&v; }
CPPSPMD_FORCE_INLINE float extractf_ps_y(const __m128& vec) { int v = extract_ps_y(vec); return *(const float*)&v; }
CPPSPMD_FORCE_INLINE float extractf_ps_z(const __m128& vec) { int v = extract_ps_z(vec); return *(const float*)&v; }
CPPSPMD_FORCE_INLINE float extractf_ps_w(const __m128& vec) { int v = extract_ps_w(vec); return *(const float*)&v; }
CPPSPMD_FORCE_INLINE float extractf_ps_x(const __m128& vec) { int v = extract_ps_x(vec); return cast_int_bits_as_float(v); }
CPPSPMD_FORCE_INLINE float extractf_ps_y(const __m128& vec) { int v = extract_ps_y(vec); return cast_int_bits_as_float(v); }
CPPSPMD_FORCE_INLINE float extractf_ps_z(const __m128& vec) { int v = extract_ps_z(vec); return cast_int_bits_as_float(v); }
CPPSPMD_FORCE_INLINE float extractf_ps_w(const __m128& vec) { int v = extract_ps_w(vec); return cast_int_bits_as_float(v); }
#endif

#if CPPSPMD_SSE2
Expand Down Expand Up @@ -1915,8 +1917,6 @@ CPPSPMD_FORCE_INLINE bool extract(const vbool& v, int instance) { assert(instanc
#define VBOOL_EXTRACT(v, instance) ( ((instance) == 0) ? extract_x((v).m_value) : (((instance) == 1) ? extract_y((v).m_value) : (((instance) == 2) ? extract_z((v).m_value) : extract_w((v).m_value))) )
#define VFLOAT_EXTRACT(v, instance) ( ((instance) == 0) ? extractf_ps_x((v).m_value) : (((instance) == 1) ? extractf_ps_y((v).m_value) : (((instance) == 2) ? extractf_ps_z((v).m_value) : extractf_ps_w((v).m_value))) )
#else
CPPSPMD_FORCE_INLINE float cast_int_bits_as_float(int v) { return *(const float*)&v; }

#define VINT_EXTRACT(v, instance) _mm_extract_epi32((v).m_value, instance)
#define VBOOL_EXTRACT(v, instance) _mm_extract_epi32((v).m_value, instance)
#define VFLOAT_EXTRACT(v, instance) cast_int_bits_as_float(_mm_extract_ps((v).m_value, instance))
Expand Down