UNPCKLPS—Unpack and Interleave Low Packed Single-Precision Floating-Point Values

Opcode/Instruction

RM

UNPCKLPS xmm1, xmm2/m128

 Op /En

64/32 bit Mode Support

V/V

CPUID Feature Flag

SSE

Description

Unpacks and Interleaves single-precision floating-point values from low quadwords of xmm1 and xmm2/m128.

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.

EVEX.NDS.128.0F.W0 14 /r

VUNPCKLPS xmm1 {k1}{z}, xmm2, xmm3/m128/m32bcst

 FV V/V AVX512VL AVX512F Unpacks and Interleaves single-precision floating-point values from low quadwords of xmm2 and xmm3/mem and write result to xmm1 subject to write mask k1.

EVEX.NDS.256.0F.W0 14 /r

VUNPCKLPS ymm1 {k1}{z}, ymm2, ymm3/m256/m32bcst

 FV V/V AVX512VL AVX512F Unpacks and Interleaves single-precision floating-point values from low quadwords of ymm2 and ymm3/mem and write result to ymm1 subject to write mask k1.

EVEX.NDS.512.0F.W0 14 /r

VUNPCKLPS zmm1 {k1}{z}, zmm2, zmm3/m512/m32bcst

 FV V/V AVX512F Unpacks and Interleaves single-precision floating-point values from low quadwords of zmm2 and zmm3/m512/m32bcst and write result to zmm1 subject to write mask k1.

Instruction Operand Encoding

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
FV ModRM:reg (w) EVEX.vvvv (r) ModRM:r/m (r) NA

Description

Performs an interleaved unpack of the low single-precision floating-point values from the first source operand and the second source operand.

128-bit Legacy SSE version: The second source can be an XMM register or an 128-bit memory location. The desti-nation is not distinct from the first source XMM register and the upper bits (MAX_VL-1:128) of the corresponding ZMM register destination are unmodified. 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.

VEX.128 encoded version: The first source operand is a XMM register. The second source operand can be a XMM register or a 128-bit memory location. The destination operand is a XMM register. The upper bits (MAX_VL-1:128) of the corresponding ZMM 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.

SRC1 SRC2 DEST X0 Y0 X0 X4 X4 Y4 X1 X2 X3 Y1 Y2 Y3 Y0 X1 Y1 Y4 X5 Y5 X5 Y5 X6 X7 Y6 Y7

Figure 4-28. VUNPCKLPS Operation

EVEX.512 encoded version: The first source operand is a ZMM register. The second source operand is a ZMM register, a 512-bit memory location, or a 512-bit vector broadcasted from a 32-bit memory location. The destina-tion operand is a ZMM register, conditionally updated using writemask k1.

EVEX.256 encoded version: The first source operand is a YMM register. The second source operand is a YMM register, a 256-bit memory location, or a 256-bit vector broadcasted from a 32-bit memory location. The destina-tion operand is a YMM register, conditionally updated using writemask k1.

EVEX.128 encoded version: The first source operand is an XMM register. The second source operand is a XMM register, a 128-bit memory location, or a 128-bit vector broadcasted from a 32-bit memory location. The destina-tion operand is a XMM register, conditionally updated using writemask k1.

Operation

VUNPCKLPS (EVEX encoded version when SRC2 is a ZMM register)

(KL, VL) = (4, 128), (8, 256), (16, 512)

IF VL >= 128

TMP_DEST[31:0] (cid:197) SRC1[31:0]

TMP_DEST[63:32] (cid:197) SRC2[31:0]

TMP_DEST[95:64] (cid:197) SRC1[63:32]

TMP_DEST[127:96] (cid:197) SRC2[63:32]

FI;

IF VL >= 256

TMP_DEST[159:128] (cid:197) SRC1[159:128]

TMP_DEST[191:160] (cid:197) SRC2[159:128]

TMP_DEST[223:192] (cid:197) SRC1[191:160]

TMP_DEST[255:224] (cid:197) SRC2[191:160]

FI;

IF VL >= 512

TMP_DEST[287:256] (cid:197) SRC1[287:256]

TMP_DEST[319:288] (cid:197) SRC2[287:256]

TMP_DEST[351:320] (cid:197) SRC1[319:288]

TMP_DEST[383:352] (cid:197) SRC2[319:288]

TMP_DEST[415:384] (cid:197) SRC1[415:384]

TMP_DEST[447:416] (cid:197) SRC2[415:384]

TMP_DEST[479:448] (cid:197) SRC1[447:416]

TMP_DEST[511:480] (cid:197) SRC2[447:416]

FI;

FOR j (cid:197) 0 TO KL-1

i (cid:197) j * 32

IF k1[j] OR *no writemask*

THEN DEST[i+31:i] (cid:197) TMP_DEST[i+31:i]

ELSE

IF *merging-masking*

; merging-masking

THEN *DEST[i+31:i] remains unchanged*

ELSE *zeroing-masking*

; zeroing-masking

DEST[i+31:i] (cid:197) 0

FI

FI;

ENDFOR

DEST[MAX_VL-1:VL] (cid:197) 0

VUNPCKLPS (EVEX encoded version when SRC2 is memory)

(KL, VL) = (4, 128), (8, 256), (16, 512)

FOR j (cid:197) 0 TO KL-1

i (cid:197) j * 31

IF (EVEX.b = 1)

THEN TMP_SRC2[i+31:i] (cid:197) SRC2[31:0]

ELSE TMP_SRC2[i+31:i] (cid:197) SRC2[i+31:i]

FI;

ENDFOR;

IF VL >= 128

TMP_DEST[31:0] (cid:197) SRC1[31:0]

TMP_DEST[63:32] (cid:197) TMP_SRC2[31:0]

TMP_DEST[95:64] (cid:197) SRC1[63:32]

TMP_DEST[127:96] (cid:197) TMP_SRC2[63:32]

FI;

IF VL >= 256

TMP_DEST[159:128] (cid:197) SRC1[159:128]

TMP_DEST[191:160] (cid:197) TMP_SRC2[159:128]

TMP_DEST[223:192] (cid:197) SRC1[191:160]

TMP_DEST[255:224] (cid:197) TMP_SRC2[191:160]

FI;

IF VL >= 512

TMP_DEST[287:256] (cid:197) SRC1[287:256]

TMP_DEST[319:288] (cid:197) TMP_SRC2[287:256]

TMP_DEST[351:320] (cid:197) SRC1[319:288]

TMP_DEST[383:352] (cid:197) TMP_SRC2[319:288]

TMP_DEST[415:384] (cid:197) SRC1[415:384]

TMP_DEST[447:416] (cid:197) TMP_SRC2[415:384]

TMP_DEST[479:448] (cid:197) SRC1[447:416]

TMP_DEST[511:480] (cid:197) TMP_SRC2[447:416]

FI;

FOR j (cid:197) 0 TO KL-1

i (cid:197) j * 32

IF k1[j] OR *no writemask*

THEN DEST[i+31:i] (cid:197) TMP_DEST[i+31:i]

ELSE

IF *merging-masking*

; merging-masking

THEN *DEST[i+31:i] remains unchanged*

ELSE *zeroing-masking*

; zeroing-masking

DEST[i+31:i] (cid:197) 0

FI

FI;

ENDFOR

DEST[MAX_VL-1:VL] (cid:197) 0

UNPCKLPS (VEX.256 encoded version)

DEST[31:0] (cid:197)SRC1[31:0]

DEST[63:32] (cid:197)SRC2[31:0]

DEST[95:64] (cid:197)SRC1[63:32]

DEST[127:96] (cid:197)SRC2[63:32]

DEST[159:128] (cid:197)SRC1[159:128]

DEST[191:160] (cid:197)SRC2[159:128]

DEST[223:192] (cid:197)SRC1[191:160]

DEST[255:224] (cid:197)SRC2[191:160]

DEST[MAX_VL-1:256] (cid:197) 0

VUNPCKLPS (VEX.128 encoded version)

DEST[31:0] (cid:197)SRC1[31:0]

DEST[63:32] (cid:197)SRC2[31:0]

DEST[95:64] (cid:197)SRC1[63:32]

DEST[127:96] (cid:197)SRC2[63:32]

DEST[MAX_VL-1:128] (cid:197)0

UNPCKLPS (128-bit Legacy SSE version)

DEST[31:0] (cid:197)SRC1[31:0]

DEST[63:32] (cid:197)SRC2[31:0]

DEST[95:64] (cid:197)SRC1[63:32]

DEST[127:96] (cid:197)SRC2[63:32]

DEST[MAX_VL-1:128] (Unmodified)

Intel C/C++ Compiler Intrinsic Equivalent

VUNPCKLPS __m512 _mm512_unpacklo_ps(__m512 a, __m512 b);

VUNPCKLPS __m512 _mm512_mask_unpacklo_ps(__m512 s, __mmask16 k, __m512 a, __m512 b);

VUNPCKLPS __m512 _mm512_maskz_unpacklo_ps(__mmask16 k, __m512 a, __m512 b);

VUNPCKLPS __m256 _mm256_unpacklo_ps (__m256 a, __m256 b);

VUNPCKLPS __m256 _mm256_mask_unpacklo_ps(__m256 s, __mmask8 k, __m256 a, __m256 b);

VUNPCKLPS __m256 _mm256_maskz_unpacklo_ps(__mmask8 k, __m256 a, __m256 b);

UNPCKLPS __m128 _mm_unpacklo_ps (__m128 a, __m128 b);

VUNPCKLPS __m128 _mm_mask_unpacklo_ps(__m128 s, __mmask8 k, __m128 a, __m128 b);

VUNPCKLPS __m128 _mm_maskz_unpacklo_ps(__mmask8 k, __m128 a, __m128 b);

SIMD Floating-Point Exceptions

None

Other Exceptions

Non-EVEX-encoded instructions, see Exceptions Type 4.

EVEX-encoded instructions, see Exceptions Type E4NF.