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VCVTQQ2PD—Convert Packed Quadword 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.W1 E6 /r

VCVTQQ2PD xmm1 {k1}{z}, xmm2/m128/m64bcst

 FV V/V

AVX512VL

AVX512DQ

 Convert two packed quadword integers from xmm2/m128/m64bcst to packed double-precision floating-point values in xmm1 with writemask k1.

EVEX.256.F3.0F.W1 E6 /r

VCVTQQ2PD ymm1 {k1}{z}, ymm2/m256/m64bcst

 FV V/V

AVX512VL

AVX512DQ

 Convert four packed quadword integers from ymm2/m256/m64bcst to packed double-precision floating-point values in ymm1 with writemask k1.

EVEX.512.F3.0F.W1 E6 /r

VCVTQQ2PD zmm1 {k1}{z}, zmm2/m512/m64bcst{er}

 FV V/V AVX512DQ Convert eight packed quadword integers from zmm2/m512/m64bcst to eight packed double-precision floating-point values in zmm1 with writemask k1.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
FV ModRM:reg (w) ModRM:r/m (r) NA NA

Description

Converts packed quadword 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 ZMM/YMM/XMM register or a 512/256/128-bit memory location. The destination operation is a ZMM/YMM/XMM register conditionally updated with writemask k1.

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

Operation


VCVTQQ2PD (EVEX2 encoded versions) when src operand is a register

(KL, VL) = (2, 128), (4, 256), (8, 512)
IF (VL == 512) AND (EVEX.b == 1)
    THEN
    SET_RM(EVEX.RC);
    ELSE
    SET_RM(MXCSR.RM);
FI;
FOR j (cid:197) 0 TO KL-1
    i (cid:197) j * 64
    IF k1[j] OR *no writemask*
        THEN DEST[i+63:i] (cid:197)
        Convert_QuadInteger_To_Double_Precision_Floating_Point(SRC[i+63:i])
        ELSE
        IF *merging-masking*
            ; merging-masking
            THEN *DEST[i+63:i] remains unchanged*
            ELSE
            ; zeroing-masking
            DEST[i+63:i] (cid:197) 0
        FI
    FI;
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 0


VCVTQQ2PD (EVEX encoded versions) when src operand is a memory source

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j (cid:197) 0 TO KL-1
    i (cid:197) j * 64
    IF k1[j] OR *no writemask*
        THEN
        IF (EVEX.b == 1)
            THEN
            DEST[i+63:i] (cid:197)
            Convert_QuadInteger_To_Double_Precision_Floating_Point(SRC[63:0])
            ELSE
            DEST[i+63:i] (cid:197)
            Convert_QuadInteger_To_Double_Precision_Floating_Point(SRC[i+63:i])
        FI;
        ELSE
        IF *merging-masking*
            ; merging-masking
            THEN *DEST[i+63:i] remains unchanged*
            ELSE
            ; zeroing-masking
            DEST[i+63:i] (cid:197) 0
        FI
    FI;
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 0



Intel C/C++ Compiler Intrinsic Equivalent


VCVTQQ2PD __m512d _mm512_cvtepi64_pd( __m512i a);
VCVTQQ2PD __m512d _mm512_mask_cvtepi64_pd( __m512d s, __mmask16 k, __m512i a);
VCVTQQ2PD __m512d _mm512_maskz_cvtepi64_pd( __mmask16 k, __m512i a);
VCVTQQ2PD __m512d _mm512_cvt_roundepi64_pd( __m512i a, int r);
VCVTQQ2PD __m512d _mm512_mask_cvt_roundepi_ps( __m512d s, __mmask8 k, __m512i a, int r);
VCVTQQ2PD __m512d _mm512_maskz_cvt_roundepi64_pd( __mmask8 k, __m512i a, int r);
VCVTQQ2PD __m256d _mm256_mask_cvtepi64_pd( __m256d s, __mmask8 k, __m256i a);
VCVTQQ2PD __m256d _mm256_maskz_cvtepi64_pd( __mmask8 k, __m256i a);
VCVTQQ2PD __m128d _mm_mask_cvtepi64_pd( __m128d s, __mmask8 k, __m128i a);
VCVTQQ2PD __m128d _mm_maskz_cvtepi64_pd( __mmask8 k, __m128i a);



SIMD Floating-Point Exceptions


Precision


Other Exceptions





EVEX-encoded instructions, see Exceptions Type E2



If EVEX.vvvv != 1111B.