Set Intrinsics

The Intel® Streaming SIMD Extensions 2 (Intel® SSE2) intrinsics for floating-point set operations are listed in this topic. The prototypes for the Intel® SSE2 intrinsics are in the emmintrin.h header file.

The load and set operations are similar in that both initialize __m128d data. However, the set operations take a double argument and are intended for initialization with constants, while the load operations take a double pointer argument and are intended to mimic the instructions for loading data from memory.

Some of the these intrinsics are composite intrinsics because they require more than one instruction to implement them.

The results of each intrinsic operation are placed in a register. The information about what is placed in each register appears in the tables below, in the detailed explanation for each intrinsic. For each intrinsic, the resulting register is represented by R0 and R1, where R0 and R1 each represent one piece of the result register.

Intrinsic Name	Operation	Corresponding Intel® SSE2 Instruction
_mm_set_sd	Sets lower DP FP value to w and upper to zero	Composite
_mm_set1_pd	Sets two DP FP valus to w	Composite
_mm_set_pd	Sets lower DP FP to x and upper to w	Composite
_mm_setr_pd	Sets lower DP FP to w and upper to x	Composite
_mm_setzero_pd	Sets two DP FP values to zero	XORPD
_mm_move_sd	Sets lower DP FP value to the lower DP FP value of b	MOVSD

__m128d _mm_set_sd(double w)

Sets the lower DP FP value to w and sets the upper DP FP value to zero.

R0	R1
w	0.0

__m128d _mm_set1_pd(double w)

Sets the 2 DP FP values to w.

R0	R1
w	w

__m128d _mm_set_pd(double w, double x)

Sets the lower DP FP value to x and sets the upper DP FP value to w.

R0	R1
x	w

__m128d _mm_setr_pd(double w, double x)

Sets the lower DP FP value to w and sets the upper DP FP value to x. r0 := w r1 := x

R0	R1
w	x

__m128d _mm_setzero_pd(void)

Sets the 2 DP FP values to zero.

R0	R1
0.0	0.0

__m128d _mm_move_sd( __m128d a, __m128d b)

Sets the lower DP FP value to the lower DP FP value of b. The upper DP FP value is passed through from a.

R0	R1
b0	a1