VCVTUDQ2PD

VCVTUDQ2PD — Convert Packed Unsigned Doubleword Integers to Packed Double-Precision Floating-Point Values

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.128.F3.0F.W0 7A /r VCVTUDQ2PD xmm1 {k1}{z}, xmm2/m64/m32bcst	A	V/V	AVX512VL AVX512F	Convert two packed unsigned doubleword integers from ymm2/m64/m32bcst to packed double-precision floating-point values in zmm1 with writemask k1.
EVEX.256.F3.0F.W0 7A /r VCVTUDQ2PD ymm1 {k1}{z}, xmm2/m128/m32bcst	A	V/V	AVX512VL AVX512F	Convert four packed unsigned doubleword integers from xmm2/m128/m32bcst to packed double-precision floating-point values in zmm1 with writemask k1.
EVEX.512.F3.0F.W0 7A /r VCVTUDQ2PD zmm1 {k1}{z}, ymm2/m256/m32bcst	A	V/V	AVX512F	Convert eight packed unsigned doubleword integers from ymm2/m256/m32bcst to eight packed double-precision floating-point values in zmm1 with writemask k1.

Instruction Operand Encoding ¶

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

Description ¶

Converts packed unsigned doubleword integers in the source operand (second operand) to packed double-precision floating-point values in the destination operand (first operand).

The source operand is a YMM/XMM/XMM (low 64 bits) register, a 256/128/64-bit memory location or a 256/128/64-bit vector broadcasted from a 32-bit memory location. The destination operand is a ZMM/YMM/XMM register conditionally updated with writemask k1.

Attempt to encode this instruction with EVEX embedded rounding is ignored.

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

Operation ¶

VCVTUDQ2PD (EVEX encoded versions) when src operand is a register ¶

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j←0 TO KL-1
    i←j * 64
    k←j * 32
    IF k1[j] OR *no writemask*
        THEN DEST[i+63:i]←
            Convert_UInteger_To_Double_Precision_Floating_Point(SRC[k+31:k])
        ELSE
            IF *merging-masking* ; merging-masking
                THEN *DEST[i+63:i] remains unchanged*
                ELSE ; zeroing-masking
                    DEST[i+63:i] ← 0
            FI
    FI;
ENDFOR
DEST[MAXVL-1:VL] ← 0

VCVTUDQ2PD (EVEX encoded versions) when src operand is a memory source ¶

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j←0 TO KL-1
    i←j * 64
    k←j * 32
    IF k1[j] OR *no writemask*
        THEN
            IF (EVEX.b = 1)
                THEN
                    DEST[i+63:i] ←
            Convert_UInteger_To_Double_Precision_Floating_Point(SRC[31:0])
                ELSE
                    DEST[i+63:i] ←
            Convert_UInteger_To_Double_Precision_Floating_Point(SRC[k+31:k])
            FI;
        ELSE
            IF *merging-masking* ; merging-masking
                THEN *DEST[i+63:i] remains unchanged*
                ELSE ; zeroing-masking
                    DEST[i+63:i] ← 0
            FI
    FI;
ENDFOR
DEST[MAXVL-1:VL] ← 0

Intel C/C++ Compiler Intrinsic Equivalent ¶

VCVTUDQ2PD __m512d _mm512_cvtepu32_pd( __m256i a);

VCVTUDQ2PD __m512d _mm512_mask_cvtepu32_pd( __m512d s, __mmask8 k, __m256i a);

VCVTUDQ2PD __m512d _mm512_maskz_cvtepu32_pd( __mmask8 k, __m256i a);

VCVTUDQ2PD __m256d _mm256_cvtepu32_pd( __m128i a);

VCVTUDQ2PD __m256d _mm256_mask_cvtepu32_pd( __m256d s, __mmask8 k, __m128i a);

VCVTUDQ2PD __m256d _mm256_maskz_cvtepu32_pd( __mmask8 k, __m128i a);

VCVTUDQ2PD __m128d _mm_cvtepu32_pd( __m128i a);

VCVTUDQ2PD __m128d _mm_mask_cvtepu32_pd( __m128d s, __mmask8 k, __m128i a);

VCVTUDQ2PD __m128d _mm_maskz_cvtepu32_pd( __mmask8 k, __m128i a);

SIMD Floating-Point Exceptions ¶

None

Other Exceptions ¶

EVEX-encoded instructions, see Exceptions Type E5.

#UD	If EVEX.vvvv != 1111B.