The following set operation intrinsics and their respective instructions are functional in the Streaming SIMD Extensions 2 (SSE2).
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.
For detailed information about an intrinsic, click on that intrinsic name in the following table.
The results of each intrinsic operation are placed in registers. The information about what is placed in each register appears in the tables below, in the detailed explanation of each intrinsic. R0 and R1 represent the registers in which results are placed.
The prototypes for SSE2 intrinsics are in the emmintrin.h header file.
| Intrinsic Name |
Operation |
Corresponding 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 |