These Intel® Streaming SIMD Extension 4 (Intel® SSE4) rounding intrinsics cover scalar and packed single-precision and double precision floating-point operands. The prototypes for these instrinsics are in the smmintrin.h file.
The floor and ceil intrinsics correspond to the definitions of floor and ceil in the ISO 9899:1999 standard for the C programming language.
Intrinsic Syntax |
Operation |
Corresponding |
|---|---|---|
__m128d _mm_round_pd(__m128d s1, int iRoundMode) __m128d _mm_floor_pd(__m128d s1) __m128d _mm_ceil_pd(__m128d s1) |
Packed float double precision rounding |
ROUNDPD |
__m128 _mm_round_ps(__m128 s1, int iRoundMode) __m128 _mm_floor_ps(__m128 s1) __m128 _mm_ceil_ps(__m128 s1) |
Packed float single precision rounding |
ROUNDPS |
__m128d _mm_round_sd(__m128d dst, __m128d s1, int iRoundMode) __m128d _mm_floor_sd(__m128d dst, __m128d s1) __m128d _mm_ceil_sd(__m128d dst, __m128d s1) |
Single float double precision rounding |
ROUNDSD |
__m128 _mm_round_ss(__m128 dst, __m128d s1, int iRoundMode) __m128 _mm_floor_ss(__m128d dst, __m128 s1) __m128 _mm_ceil_ss(__m128d dst, __m128 s1) |
Single float single precision rounding |
ROUNDSS |
Copyright © 1996-2011, Intel Corporation. All rights reserved.