VCVTUDQ2PH — Convert Packed Unsigned Doubleword Integers to Packed FP16 Values

Instruction En Bit Mode Flag Support Instruction En Bit Mode Flag Support 64/32 CPUID Feature Instruction En Bit Mode Flag CPUID Feature Instruction En Bit Mode Flag Op/ 64/32 CPUID Feature Instruction En Bit Mode Flag 64/32 CPUID Feature Instruction En Bit Mode Flag CPUID Feature Instruction En Bit Mode Flag Op/ 64/32 CPUID Feature		Support		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.”