| Opcode*/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
| 66 0F C6 /r ib SHUFPD xmm1, xmm2/m128, imm8 | RMI | V/V | SSE2 | Shuffle packed double-precision floatingpoint values selected by imm8 from xmm1 and xmm2/m128 to xmm1. |
| VEX.NDS.128.66.0F.WIG C6 /r ib VSHUFPD xmm1, xmm2, xmm3/m128, imm8 | RVMI | V/V | AVX | Shuffle Packed double-precision floatingpoint values selected by imm8 from xmm2 and xmm3/mem. |
| VEX.NDS.256.66.0F.WIG C6 /r ib VSHUFPD ymm1, ymm2, ymm3/m256, imm8 | RVMI | V/V | AVX | Shuffle Packed double-precision floatingpoint values selected by imm8 from ymm2 and ymm3/mem. |
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RMI | ModRM:reg (r, w) | ModRM:r/m (r) | imm8 | NA |
| RVMI | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | imm8 |
Moves either of the two packed double-precision floating-point values from destination operand (first operand) into the low quadword of the destination operand; moves either of the two packed double-precision floating-point values from the source operand into to the high quadword of the destination operand (see Figure 4-21). The select operand (third operand) determines which values are moved to the destination operand.
In 64-bit mode, using a REX prefix in the form of REX.R permits this instruction to access additional registers (XMM8-XMM15). 128-bit Legacy SSE version: The source can be an XMM register or an 128-bit memory location. The destination is not distinct from the first source XMM register and the upper bits (VLMAX-1:128) of the corresponding YMM register destination are unmodified. VEX.128 encoded version: the first source operand is an XMM register or 128-bit memory location. The destination operand is an XMM register. The upper bits (VLMAX-1:128) of the corresponding YMM register destination are zeroed. VEX.256 encoded version: The first source operand is a YMM register. The second source operand can be a YMM register or a 256-bit memory location. The destination operand is a YMM register.
| X1 | X0 DEST |
| Y1 | Y0 X1 or X0 |
| SHUFPD Shuffle Operation | Figure 4-21. |
The source operand can be an XMM register or a 128-bit memory location. The destination operand is an XMM register. The select operand is an 8-bit immediate: bit 0 selects which value is moved from the destination operand to the result (where 0 selects the low quadword and 1 selects the high quadword) and bit 1 selects which value is moved from the source operand to the result. Bits 2 through 7 of the select operand are reserved and must be set to 0.
IF SELECT[0] = 0 THEN DEST[63:0] ELSE DEST[63:0] IF SELECT[1] = 0 THEN DEST[127:64] ELSE DEST[127:64] SHUFPD (128-bit Legacy SSE version) IF IMM0[0] = 0 THEN DEST[63:0] ← SRC1[63:0] ELSE DEST[63:0] ← SRC1[127:64] FI; IF IMM0[1] = 0 THEN DEST[127:64] ← SRC2[63:0] ELSE DEST[127:64] ← SRC2[127:64] FI; DEST[VLMAX-1:128] (Unmodified) VSHUFPD (VEX.128 encoded version) IF IMM0[0] = 0 THEN DEST[63:0] ← SRC1[63:0] ELSE DEST[63:0] ← SRC1[127:64] FI; IF IMM0[1] = 0 THEN DEST[127:64] ← SRC2[63:0] ELSE DEST[127:64] ← SRC2[127:64] FI; DEST[VLMAX-1:128] ← 0 VSHUFPD (VEX.256 encoded version) IF IMM0[0] = 0 THEN DEST[63:0] ← SRC1[63:0] ELSE DEST[63:0] ← SRC1[127:64] FI; IF IMM0[1] = 0 THEN DEST[127:64] ← SRC2[63:0] ELSE DEST[127:64] ← SRC2[127:64] FI; IF IMM0[2] = 0 THEN DEST[191:128] ← SRC1[191:128] ELSE DEST[191:128] ← SRC1[255:192] FI; IF IMM0[3] = 0 THEN DEST[255:192] ← SRC2[191:128] ELSE DEST[255:192] ← SRC2[255:192] FI;
| SHUFPD: | __m128d _mm_shuffle_pd(__m128d a, __m128d b, unsigned int imm8) |
| VSHUFPD: | __m256d _mm256_shuffle_pd (__m256d a, __m256d b, const int select); |
None.
See Exceptions Type 4.