| Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
| 0F 14 /r UNPCKLPS xmm1, xmm2/m128 | RM | V/V | SSE | Unpacks and Interleaves single-precision floating-point values from low quadwords of xmm1 and xmm2/mem into xmm1. |
| VEX.NDS.128.0F.WIG 14 /r VUNPCKLPS xmm1,xmm2, xmm3/m128 | RVM | V/V | AVX | Unpacks and Interleaves single-precision floating-point values from low quadwords of xmm2 and xmm3/m128. |
| VEX.NDS.256.0F.WIG 14 /r VUNPCKLPS ymm1,ymm2,ymm3/m256 | RVM | V/V | AVX | Unpacks and Interleaves single-precision floating-point values from low quadwords of ymm2 and ymm3/m256. |
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RM | ModRM:reg (r, w) | ModRM:r/m (r) | NA | NA |
| RVM | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | NA |
Performs an interleaved unpack of the low-order single-precision floating-point values from the source operand (second operand) and the destination operand (first operand). See Figure 4-26. The source operand can be an XMM register or a 128-bit memory location; the destination operand is an XMM register.
| DEST | X3 | X2 | X1 | X0 |
| SRC | Y3 | Y2 | Y1 | Y0 |
| DEST | Y1 UNPCKLPS Instruction Low Unpack and Interleave Operation | X1 | Y0 | X0 Figure 4-26. |
When unpacking from a memory operand, an implementation may fetch only the appropriate 64 bits; however, alignment to 16-byte boundary and normal segment checking will still be enforced.
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 second 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.
UNPCKLPS (128-bit Legacy SSE version) DEST[31:0] ← SRC1[31:0] DEST[63:32] ← SRC2[31:0] DEST[95:64] ← SRC1[63:32] DEST[127:96] ← SRC2[63:32] DEST[VLMAX-1:128] (Unmodified) VUNPCKLPS (VEX.128 encoded version) DEST[31:0] ← SRC1[31:0] DEST[63:32] ← SRC2[31:0] DEST[95:64] ← SRC1[63:32] DEST[127:96] ← SRC2[63:32] DEST[VLMAX-1:128] ← 0 UNPCKLPS (VEX.256 encoded version) DEST[31:0] ← SRC1[31:0] DEST[63:32] ← SRC2[31:0] DEST[95:64] ← SRC1[63:32] DEST[127:96] ← SRC2[63:32] DEST[159:128] ← SRC1[159:128] DEST[191:160] ← SRC2[159:128] DEST[223:192] ← SRC1[191:160] DEST[255:224] ← SRC2[191:160]
| UNPCKLPS: | __m128 _mm_unpacklo_ps(__m128 a, __m128 b) |
| UNPCKLPS: | __m256 _mm256_unpacklo_ps (__m256 a, __m256 b); |
None.
See Exceptions Type 4.