x86doc › VCVTUDQ2PH - Convert Packed Unsigned Doubleword Integers to Packed FP16 Values

VCVTUDQ2PH—Convert Packed Unsigned Doubleword Integers to Packed FP16 Values

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.128.F2.MAP5.W0 7A /r VCVTUDQ2PH xmm1{k1}{z}, xmm2/m128/m32bcst	A	V/V	AVX512-FP16 AVX512VL	Convert four packed unsigned doubleword integers from xmm2/m128/m32bcst to packed FP16 values, and store the result in xmm1 subject to writemask k1.
EVEX.256.F2.MAP5.W0 7A /r VCVTUDQ2PH xmm1{k1}{z}, ymm2/m256/m32bcst	A	V/V	AVX512-FP16 AVX512VL	Convert eight packed unsigned doubleword integers from ymm2/m256/m32bcst to packed FP16 values, and store the result in xmm1 subject to writemask k1.
EVEX.512.F2.MAP5.W0 7A /r VCVTUDQ2PH ymm1{k1}{z}, zmm2/m512/m32bcst {er}	A	V/V	AVX512-FP16	Convert sixteen packed unsigned doubleword integers from zmm2/m512/m32bcst to packed FP16 values, and store the result in ymm1 subject to writemask k1.

Instruction Operand Encoding

Op/En	Tuple	Operand 1	Operand 2	Operand 3	Operand 4
A	Full	ModRM:reg (w)	ModRM:r/m (r)	N/A	N/A

Description

This instruction converts packed unsigned doubleword integers in the source operand to packed FP16 values in the destination operand. The destination elements are updated according to the writemask.

EVEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.

If the result of the convert operation is overflow and MXCSR.OM=0 then a SIMD exception will be raised with OE=1, PE=1.

Operation

VCVTUDQ2PH dest, src

VL = 128, 256 or 512

KL := VL / 32

IF *SRC is a register* and (VL = 512) AND (EVEX.b = 1):

SET_RM(EVEX.RC)

ELSE:

SET_RM(MXCSR.RC)

FOR j := 0 TO KL-1:

IF k1[j] OR *no writemask*:

IF *SRC is memory* and EVEX.b = 1:

tsrc := SRC.dword[0]

ELSE

tsrc := SRC.dword[j]

DEST.fp16[j] := Convert_unsigned_integer32_to_fp16(tsrc)

ELSE IF *zeroing*:

DEST.fp16[j] := 0

// else dest.fp16[j] remains unchanged

DEST[MAXVL-1:VL/2] := 0

Intel C/C++ Compiler Intrinsic Equivalent

VCVTUDQ2PH __m256h _mm512_cvt_roundepu32_ph (__m512i a, int rounding);

VCVTUDQ2PH __m256h _mm512_mask_cvt_roundepu32_ph (__m256h src, __mmask16 k, __m512i a, int rounding);

VCVTUDQ2PH __m256h _mm512_maskz_cvt_roundepu32_ph (__mmask16 k, __m512i a, int rounding);

VCVTUDQ2PH __m128h _mm_cvtepu32_ph (__m128i a);

VCVTUDQ2PH __m128h _mm_mask_cvtepu32_ph (__m128h src, __mmask8 k, __m128i a);

VCVTUDQ2PH __m128h _mm_maskz_cvtepu32_ph (__mmask8 k, __m128i a);

VCVTUDQ2PH __m128h _mm256_cvtepu32_ph (__m256i a);

VCVTUDQ2PH __m128h _mm256_mask_cvtepu32_ph (__m128h src, __mmask8 k, __m256i a);

VCVTUDQ2PH __m128h _mm256_maskz_cvtepu32_ph (__mmask8 k, __m256i a);

VCVTUDQ2PH __m256h _mm512_cvtepu32_ph (__m512i a);

VCVTUDQ2PH __m256h _mm512_mask_cvtepu32_ph (__m256h src, __mmask16 k, __m512i a);

VCVTUDQ2PH __m256h _mm512_maskz_cvtepu32_ph (__mmask16 k, __m512i a);

SIMD Floating-Point Exceptions

Overflow, Precision.

Other Exceptions

EVEX-encoded instructions, see Table 2-46, “Type E2 Class Exception Conditions.”