vcvtuqq2pd

Convert Packed Unsigned Quadword to Double

VCVTUQ2PD zmm1 {k1}, zmm2/m512

Converts unsigned 64-bit integers to 64-bit doubles.

Details

Converts eight unsigned 64-bit quadwords (from a 512-bit ZMM or memory operand) to eight 64-bit double-precision floating-point values, storing the result in a 512-bit ZMM register with optional opmask write control. The conversion uses the current rounding mode from MXCSR. Executes in 64-bit mode only and requires AVX-512F; full precision is maintained since IEEE 754 double can exactly represent all 64-bit unsigned integers.

Pseudocode Operation

for i ← 0 to 7
  if k1[i] or no mask:
    zmm1[64*i:64*i+63] ← convert_uq_to_pd(zmm2_or_mem[64*i:64*i+63])
  else if zeroing:
    zmm1[64*i:64*i+63] ← 0

Example

VCVTUQ2PD zmm1, zmm2/m512

Encoding

Binary Layout

EVEX

Format EVEX

Opcode EVEX.512.F3.0F.W1 7A /r

Extension AVX-512F

Operands

dest
512-bit ZMM AVX-512 register
src
512-bit ZMM AVX-512 register or Memory operand

Reference (Intel® SDM)

Instruction Forms

Opcode	Instruction	Op/En	64/32-bit Mode	CPUID	Description
EVEX.128.F3.0F.W1 7A /r	VCVTUQQ2PD xmm1 {k1}{z}, xmm2/m128/m64bcst	A	V/V	(AVX512VL AND AVX512DQ) OR AVX10.1	Convert two packed unsigned quadword integers from xmm2/m128/m64bcst to two packed double precision floating-point values in xmm1 with writemask k1.
EVEX.256.F3.0F.W1 7A /r	VCVTUQQ2PD ymm1 {k1}{z}, ymm2/m256/m64bcst	A	V/V	(AVX512VL AND AVX512DQ) OR AVX10.1	Convert four packed unsigned quadword integers from ymm2/m256/m64bcst to packed double precision floating-point values in ymm1 with writemask k1.
EVEX.512.F3.0F.W1 7A /r	VCVTUQQ2PD zmm1 {k1}{z}, zmm2/m512/m64bcst {er}	A	V/V	AVX512DQ OR AVX10.1	Convert eight packed unsigned quadword integers from zmm2/m512/m64bcst 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	Full	ModRM:reg (w)	ModRM:r/m (r)	N/A	N/A

Description

Converts packed unsigned 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, a 512/256/128-bit memory location or a 512/256/128-bit vector broadcasted from a 64-bit memory location. The destination operand is a ZMM/YMM/XMM register conditionally updated with writemask k1. Note: EVEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD.

Operation

VCVTUQQ2PD (EVEX Encoded Version) When SRC Operand is a Register
(KL, VL) = (2, 128), (4, 256), (8, 512)
IF (VL == 512) AND (EVEX.b == 1)
THEN
SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC);
ELSE
SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC);
FI;

FOR j := 0 TO KL-1
i := j * 64
IF k1[j] OR *no writemask*
THEN DEST[i+63:i] :=
Convert_UQuadInteger_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] := 0
FI
FI;
ENDFOR


VCVTUQQ2PD—Convert Packed Unsigned Quadword Integers to Packed Double Precision Floating-Point Values                            Vol. 2C 5-138
DEST[MAXVL-1:VL] := 0

VCVTUQQ2PD (EVEX Encoded Version) When SRC Operand is a Memory Source
(KL, VL) = (2, 128), (4, 256), (8, 512)

FOR j := 0 TO KL-1
i := j * 64
IF k1[j] OR *no writemask*
THEN
IF (EVEX.b == 1)
THEN
DEST[i+63:i] :=
Convert_UQuadInteger_To_Double_Precision_Floating_Point(SRC[63:0])
ELSE
DEST[i+63:i] :=
Convert_UQuadInteger_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] := 0
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0

Intel C/C++ Compiler Intrinsic Equivalent

VCVTUQQ2PD __m512d _mm512_cvtepu64_ps( __m512i a);
VCVTUQQ2PD __m512d _mm512_mask_cvtepu64_ps( __m512d s, __mmask8 k, __m512i a);
VCVTUQQ2PD __m512d _mm512_maskz_cvtepu64_ps( __mmask8 k, __m512i a);
VCVTUQQ2PD __m512d _mm512_cvt_roundepu64_ps( __m512i a, int r);
VCVTUQQ2PD __m512d _mm512_mask_cvt_roundepu64_ps( __m512d s, __mmask8 k, __m512i a, int r);
VCVTUQQ2PD __m512d _mm512_maskz_cvt_roundepu64_ps( __mmask8 k, __m512i a, int r);
VCVTUQQ2PD __m256d _mm256_cvtepu64_ps( __m256i a);
VCVTUQQ2PD __m256d _mm256_mask_cvtepu64_ps( __m256d s, __mmask8 k, __m256i a);
VCVTUQQ2PD __m256d _mm256_maskz_cvtepu64_ps( __mmask8 k, __m256i a);
VCVTUQQ2PD __m128d _mm_cvtepu64_ps( __m128i a);
VCVTUQQ2PD __m128d _mm_mask_cvtepu64_ps( __m128d s, __mmask8 k, __m128i a);
VCVTUQQ2PD __m128d _mm_maskz_cvtepu64_ps( __mmask8 k, __m128i a);

Exceptions

SIMD Floating-Point Exceptions

Precision.

Other Exceptions

EVEX-encoded instructions, see Table 2-48, “Type E2 Class Exception Conditions.” Additionally: #UD If EVEX.vvvv != 1111B. VCVTUQQ2PD—Convert Packed Unsigned Quadword Integers to Packed Double Precision Floating-Point Values Vol. 2C 5-139