| Opcode/Instruction | Op /En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
| EVEX.128.F3.0F38.W0 30 /r VPMOVWB xmm1/m64 {k1}{z}, xmm2 | A | V/V | AVX512VL AVX512BW | Converts 8 packed word integers from xmm2 into 8 packed bytes in xmm1/m64 with truncation under writemask k1. |
| EVEX.128.F3.0F38.W0 20 /r VPMOVSWB xmm1/m64 {k1}{z}, xmm2 | A | V/V | AVX512VL AVX512BW | Converts 8 packed signed word integers from xmm2 into 8 packed signed bytes in xmm1/m64 using signed saturation under writemask k1. |
| EVEX.128.F3.0F38.W0 10 /r VPMOVUSWB xmm1/m64 {k1}{z}, xmm2 | A | V/V | AVX512VL AVX512BW | Converts 8 packed unsigned word integers from xmm2 into 8 packed unsigned bytes in 8mm1/m64 using unsigned saturation under writemask k1. |
| EVEX.256.F3.0F38.W0 30 /r VPMOVWB xmm1/m128 {k1}{z}, ymm2 | A | V/V | AVX512VL AVX512BW | Converts 16 packed word integers from ymm2 into 16 packed bytes in xmm1/m128 with truncation under writemask k1. |
| EVEX.256.F3.0F38.W0 20 /r VPMOVSWB xmm1/m128 {k1}{z}, ymm2 | A | V/V | AVX512VL AVX512BW | Converts 16 packed signed word integers from ymm2 into 16 packed signed bytes in xmm1/m128 using signed saturation under writemask k1. |
| EVEX.256.F3.0F38.W0 10 /r VPMOVUSWB xmm1/m128 {k1}{z}, ymm2 | A | V/V | AVX512VL AVX512BW | Converts 16 packed unsigned word integers from ymm2 into 16 packed unsigned bytes in xmm1/m128 using unsigned saturation under writemask k1. |
| EVEX.512.F3.0F38.W0 30 /r VPMOVWB ymm1/m256 {k1}{z}, zmm2 | A | V/V | AVX512BW | Converts 32 packed word integers from zmm2 into 32 packed bytes in ymm1/m256 with truncation under writemask k1. |
| EVEX.512.F3.0F38.W0 20 /r VPMOVSWB ymm1/m256 {k1}{z}, zmm2 | A | V/V | AVX512BW | Converts 32 packed signed word integers from zmm2 into 32 packed signed bytes in ymm1/m256 using signed saturation under writemask k1. |
| EVEX.512.F3.0F38.W0 10 /r VPMOVUSWB ymm1/m256 {k1}{z}, zmm2 | A | V/V | AVX512BW | Converts 32 packed unsigned word integers from zmm2 into 32 packed unsigned bytes in ymm1/m256 using unsigned saturation under writemask k1. |
| Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|---|
| A | Half Mem | ModRM:r/m (w) | ModRM:reg (r) | N/A | N/A |
Description
VPMOVWB down converts 16-bit integers into packed bytes using truncation. VPMOVSWB converts signed 16-bit integers into packed signed bytes using signed saturation. VPMOVUSWB convert unsigned word values into unsigned byte values using unsigned saturation.
The source operand is a ZMM/YMM/XMM register. The destination operand is a YMM/XMM/XMM register or a 256/128/64-bit memory location.
Down-converted byte elements are written to the destination operand (the first operand) from the least-significant byte. Byte elements of the destination operand are updated according to the writemask. Bits (MAXVL-1:256/128/64) of the register destination are zeroed.
Note: EVEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.
Operation
VPMOVWB instruction (EVEX encoded versions) when dest is a register
(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j := 0 TO Kl-1
i := j * 8
m := j * 16
IF k1[j] OR *no writemask*
THEN DEST[i+7:i] := TruncateWordToByte (SRC[m+15:m])
ELSE
IF *merging-masking*
; merging-masking
THEN *DEST[i+7:i] remains unchanged*
ELSE *zeroing-masking*
; zeroing-masking
DEST[i+7:i] = 0
FI
FI;
ENDFOR
DEST[MAXVL-1:VL/2] := 0;
VPMOVWB instruction (EVEX encoded versions) when dest is memory
(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j := 0 TO Kl-1
i := j * 8
m := j * 16
IF k1[j] OR *no writemask*
THEN DEST[i+7:i] := TruncateWordToByte (SRC[m+15:m])
ELSE
*DEST[i+7:i] remains unchanged*
; merging-masking
FI;
ENDFOR
VPMOVSWB instruction (EVEX encoded versions) when dest is a register
(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j := 0 TO Kl-1
i := j * 8
m := j * 16
IF k1[j] OR *no writemask*
THEN DEST[i+7:i] := SaturateSignedWordToByte (SRC[m+15:m])
ELSE
IF *merging-masking*
; merging-masking
THEN *DEST[i+7:i] remains unchanged*
ELSE *zeroing-masking*
; zeroing-masking
DEST[i+7:i] = 0
FI
FI;
ENDFOR
DEST[MAXVL-1:VL/2] := 0;
VPMOVSWB instruction (EVEX encoded versions) when dest is memory
(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j := 0 TO Kl-1
i := j * 8
m := j * 16
IF k1[j] OR *no writemask*
THEN DEST[i+7:i] := SaturateSignedWordToByte (SRC[m+15:m])
ELSE
*DEST[i+7:i] remains unchanged*
; merging-masking
FI;
ENDFOR
VPMOVUSWB instruction (EVEX encoded versions) when dest is a register
(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j := 0 TO Kl-1
i := j * 8
m := j * 16
IF k1[j] OR *no writemask*
THEN DEST[i+7:i] := SaturateUnsignedWordToByte (SRC[m+15:m])
ELSE
IF *merging-masking*
; merging-masking
THEN *DEST[i+7:i] remains unchanged*
ELSE *zeroing-masking*
; zeroing-masking
DEST[i+7:i] = 0
FI
FI;
ENDFOR
DEST[MAXVL-1:VL/2] := 0;
VPMOVUSWB instruction (EVEX encoded versions) when dest is memory
(KL, VL) = (8, 128), (16, 256), (32, 512)
FOR j := 0 TO Kl-1
i := j * 8
m := j * 16
IF k1[j] OR *no writemask*
THEN DEST[i+7:i] := SaturateUnsignedWordToByte (SRC[m+15:m])
ELSE
*DEST[i+7:i] remains unchanged*
; merging-masking
FI;
ENDFOR
Intel C/C++ Compiler Intrinsic Equivalents
VPMOVUSWB __m256i _mm512_cvtusepi16_epi8(__m512i a);
VPMOVUSWB __m256i _mm512_mask_cvtusepi16_epi8(__m256i a, __mmask32 k, __m512i b);
VPMOVUSWB __m256i _mm512_maskz_cvtusepi16_epi8( __mmask32 k, __m512i b);
VPMOVUSWB void _mm512_mask_cvtusepi16_storeu_epi8(void * , __mmask32 k, __m512i b);
VPMOVSWB __m256i _mm512_cvtsepi16_epi8(__m512i a);
VPMOVSWB __m256i _mm512_mask_cvtsepi16_epi8(__m256i a, __mmask32 k, __m512i b);
VPMOVSWB __m256i _mm512_maskz_cvtsepi16_epi8( __mmask32 k, __m512i b);
VPMOVSWB void _mm512_mask_cvtsepi16_storeu_epi8(void * , __mmask32 k, __m512i b);
VPMOVWB __m256i _mm512_cvtepi16_epi8(__m512i a);
VPMOVWB __m256i _mm512_mask_cvtepi16_epi8(__m256i a, __mmask32 k, __m512i b);
VPMOVWB __m256i _mm512_maskz_cvtepi16_epi8( __mmask32 k, __m512i b);
VPMOVWB void _mm512_mask_cvtepi16_storeu_epi8(void * , __mmask32 k, __m512i b);
VPMOVUSWB __m128i _mm256_cvtusepi16_epi8(__m256i a);
VPMOVUSWB __m128i _mm256_mask_cvtusepi16_epi8(__m128i a, __mmask16 k, __m256i b);
VPMOVUSWB __m128i _mm256_maskz_cvtusepi16_epi8( __mmask16 k, __m256i b);
VPMOVUSWB void _mm256_mask_cvtusepi16_storeu_epi8(void * , __mmask16 k, __m256i b);
VPMOVUSWB __m128i _mm_cvtusepi16_epi8(__m128i a);
VPMOVUSWB __m128i _mm_mask_cvtusepi16_epi8(__m128i a, __mmask8 k, __m128i b);
VPMOVUSWB __m128i _mm_maskz_cvtusepi16_epi8( __mmask8 k, __m128i b);
VPMOVUSWB void _mm_mask_cvtusepi16_storeu_epi8(void * , __mmask8 k, __m128i b);
VPMOVSWB __m128i _mm256_cvtsepi16_epi8(__m256i a);
VPMOVSWB __m128i _mm256_mask_cvtsepi16_epi8(__m128i a, __mmask16 k, __m256i b);
VPMOVSWB __m128i _mm256_maskz_cvtsepi16_epi8( __mmask16 k, __m256i b);
VPMOVSWB void _mm256_mask_cvtsepi16_storeu_epi8(void * , __mmask16 k, __m256i b);
VPMOVSWB __m128i _mm_cvtsepi16_epi8(__m128i a);
VPMOVSWB __m128i _mm_mask_cvtsepi16_epi8(__m128i a, __mmask8 k, __m128i b);
VPMOVSWB __m128i _mm_maskz_cvtsepi16_epi8( __mmask8 k, __m128i b);
VPMOVSWB void _mm_mask_cvtsepi16_storeu_epi8(void * , __mmask8 k, __m128i b);
VPMOVWB __m128i _mm256_cvtepi16_epi8(__m256i a);
VPMOVWB __m128i _mm256_mask_cvtepi16_epi8(__m128i a, __mmask16 k, __m256i b);
VPMOVWB __m128i _mm256_maskz_cvtepi16_epi8( __mmask16 k, __m256i b);
VPMOVWB void _mm256_mask_cvtepi16_storeu_epi8(void * , __mmask16 k, __m256i b);
VPMOVWB __m128i _mm_cvtepi16_epi8(__m128i a);
VPMOVWB __m128i _mm_mask_cvtepi16_epi8(__m128i a, __mmask8 k, __m128i b);
VPMOVWB __m128i _mm_maskz_cvtepi16_epi8( __mmask8 k, __m128i b);
VPMOVWB void _mm_mask_cvtepi16_storeu_epi8(void * , __mmask8 k, __m128i b);
SIMD Floating-Point Exceptions
None.
Other Exceptions
EVEX-encoded instruction, see Table 2-53, “Type E6 Class Exception Conditions.”
Additionally:
| #UD | If EVEX.vvvv != 1111B. |