The comparison intrinsics for Streaming SIMD Extensions 2 and descriptions for each are listed in the following table.
The prototypes for Streaming SIMD Extensions 2 intrinsics are in the emmintrin.h header file.
| Intrinsic Name | Instruction | Comparison | Elements | Size of Elements |
|---|---|---|---|---|
| _mm_cmpeq_epi8 | PCMPEQB | Equality | 16 | 8 |
| _mm_cmpeq_epi16 | PCMPEQW | Equality | 8 | 16 |
| _mm_cmpeq_epi32 | PCMPEQD | Equality | 4 | 32 |
| _mm_cmpgt_epi8 | PCMPGTB | Greater Than | 16 | 8 |
| _mm_cmpgt_epi16 | PCMPGTW | Greater Than | 8 | 16 |
| _mm_cmpgt_epi32 | PCMPGTD | Greater Than | 4 | 32 |
| _mm_cmplt_epi8 | PCMPGTBr | Less Than | 16 | 8 |
| _mm_cmplt_epi16 | PCMPGTWr | Less Than | 8 | 16 |
| _mm_cmplt_epi32 | PCMPGTDr | Less Than | 4 | 32 |
__m128i _mm_cmpeq_epi8(__m128i a, __m128i b)
Compares the 16 signed or unsigned 8-bit integers in a and the 16 signed or unsigned 8-bit integers in b for equality.
r0 := (a0 == b0) ? 0xff : 0x0
r1 := (a1 == b1) ? 0xff : 0x0
...
r15 := (a15 == b15) ? 0xff : 0x0
__m128i _mm_cmpeq_epi16(__m128i a, __m128i b)
Compares the 8 signed or unsigned 16-bit integers in a and the 8 signed or unsigned 16-bit integers in b for equality.
r0 := (a0 == b0) ? 0xffff : 0x0
r1 := (a1 == b1) ? 0xffff : 0x0
...
r7 := (a7 == b7) ? 0xffff : 0x0
__m128i _mm_cmpeq_epi32(__m128i a, __m128i b)
Compares the 4 signed or unsigned 32-bit integers in a and the 4 signed or unsigned 32-bit integers in b for equality.
r0 := (a0 == b0) ? 0xffffffff : 0x0
r1 := (a1 == b1) ? 0xffffffff : 0x0
r2 := (a2 == b2) ? 0xffffffff : 0x0
r3 := (a3 == b3) ? 0xffffffff : 0x0
__m128i _mm_cmpgt_epi8(__m128i a, __m128i b)
Compares the 16 signed 8-bit integers in a and the 16 signed 8-bit integers in b for greater than.
r0 := (a0 > b0) ? 0xff : 0x0
r1 := (a1 > b1) ? 0xff : 0x0
...
r15 := (a15 > b15) ? 0xff : 0x0
__m128i _mm_cmpgt_epi16(__m128i a, __m128i b)
__m128i _mm_cmpgt_epi32(__m128i a, __m128i b)Compares the 8 signed 16-bit integers in a and the 8 signed 16-bit integers in b for greater than.
r0 := (a0 > b0) ? 0xffff : 0x0
r1 := (a1 > b1) ? 0xffff : 0x0
...
r7 := (a7 > b7) ? 0xffff : 0x0
Compares the 4 signed 32-bit integers in a and the 4 signed 32-bit integers in b for greater than.
r0 := (a0 > b0) ? 0xffff : 0x0
r1 := (a1 > b1) ? 0xffff : 0x0
r2 := (a2 > b2) ? 0xffff : 0x0
r3 := (a3 > b3) ? 0xffff : 0x0
__m128i _mm_cmplt_epi8( __m128i a, __m128i b)
Compares the 16 signed 8-bit integers in a and the 16 signed 8-bit integers in b for less than.
r0 := (a0 < b0) ? 0xff : 0x0
r1 := (a1 < b1) ? 0xff : 0x0
...
r15 := (a15 < b15) ? 0xff : 0x0
__m128i _mm_cmplt_epi16( __m128i a, __m128i b)
Compares the 8 signed 16-bit integers in a and the 8 signed 16-bit integers in b for less than.
r0 := (a0 < b0) ? 0xffff : 0x0
r1 := (a1 < b1) ? 0xffff : 0x0
...
r7 := (a7 < b7) ? 0xffff : 0x0
__m128i _mm_cmplt_epi32( __m128i a, __m128i b)
Compares the 4 signed 32-bit integers in a and the 4 signed 32-bit integers in b for less than.
r0 := (a0 < b0) ? 0xffff : 0x0
r1 := (a1 < b1) ? 0xffff : 0x0
r2 := (a2 < b2) ? 0xffff : 0x0
r3 := (a3 < b3) ? 0xffff : 0x0