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VCVTPH2UDQ

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Henk-Jan Lebbink edited this page Jun 4, 2026 · 1 revision

VCVTPH2UDQ — Convert Packed FP16 Values to Unsigned Doubleword Integers

Opcode/ Instruction Op/ En 64/32 Bit Mode Support CPUID Feature Flag Description
EVEX.128.NP.MAP5.W0 79 /r VCVTPH2UDQ xmm1{k1}{z}, xmm2/m64/m16bcst A V/V (AVX512_FP16 AND AVX512VL) OR AVX10.1 Convert four packed FP16 values in xmm2/m64/m16bcst to four unsigned doubleword integers, and store the result in xmm1 subject to writemask k1.
EVEX.256.NP.MAP5.W0 79 /r VCVTPH2UDQ ymm1{k1}{z}, xmm2/m128/m16bcst A V/V (AVX512_FP16 AND AVX512VL) OR AVX10.1 Convert eight packed FP16 values in xmm2/m128/m16bcst to eight unsigned doubleword integers, and store the result in ymm1 subject to writemask k1.
EVEX.512.NP.MAP5.W0 79 /r VCVTPH2UDQ zmm1{k1}{z}, ymm2/m256/m16bcst {er} A V/V AVX512_FP16 OR AVX10.1 Convert sixteen packed FP16 values in ymm2/m256/m16bcst to sixteen unsigned doubleword integers, and store the result in zmm1 subject to writemask k1.

Instruction Operand Encoding

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

Description

This instruction converts packed FP16 values in the source operand to unsigned doubleword integers in destination operand.

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register or the embedded rounding control bits. If a converted result cannot be represented in the destination format, the floating-point invalid exception is raised, and if this exception is masked, the integer value FFFFFFFFH is returned.

The destination elements are updated according to the writemask.

Operation

VCVTPH2UDQ 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.fp16[0]
        ELSE
            tsrc ← SRC.fp16[j]
            DEST.dword[j] ← Convert_fp16_to_unsigned_integer32(tsrc)
    ELSE IF *zeroing*:
        DEST.dword[j] ← 0
    // else dest.dword[j] remains unchanged

Intel C/C++ Compiler Intrinsic Equivalent

VCVTPH2UDQ __m512i _mm512_cvt_roundph_epu32 (__m256h a, int rounding);
VCVTPH2UDQ __m512i _mm512_mask_cvt_roundph_epu32 (__m512i src, __mmask16 k, __m256h a, int rounding);
VCVTPH2UDQ __m512i _mm512_maskz_cvt_roundph_epu32 (__mmask16 k, __m256h a, int rounding);
VCVTPH2UDQ __m128i _mm_cvtph_epu32 (__m128h a);
VCVTPH2UDQ __m128i _mm_mask_cvtph_epu32 (__m128i src, __mmask8 k, __m128h a);
VCVTPH2UDQ __m128i _mm_maskz_cvtph_epu32 (__mmask8 k, __m128h a);
VCVTPH2UDQ __m256i _mm256_cvtph_epu32 (__m128h a);
VCVTPH2UDQ __m256i _mm256_mask_cvtph_epu32 (__m256i src, __mmask8 k, __m128h a);
VCVTPH2UDQ __m256i _mm256_maskz_cvtph_epu32 (__mmask8 k, __m128h a);
VCVTPH2UDQ __m512i _mm512_cvtph_epu32 (__m256h a);
VCVTPH2UDQ __m512i _mm512_mask_cvtph_epu32 (__m512i src, __mmask16 k, __m256h a);
VCVTPH2UDQ __m512i _mm512_maskz_cvtph_epu32 (__mmask16 k, __m256h a);

SIMD Floating-Point Exceptions

Invalid, Precision.

Other Exceptions

Source: Intel® 64 and IA-32 Architectures Software Developer's Manual, Combined Volumes (Order Number 325462-091US, March 2026)
Generated: 7-6-2026

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