VCVTUDQ2PD (Intel x86/64 assembly instruction)

모두의 코드
VCVTUDQ2PD (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 508 번 읽혔습니다.

VCVTUDQ2PD

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

참고 사항

아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.

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	HV	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	HV	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	HV	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 Operand 1 Operand 2 Operand 3 Operand 4

HV ModRM:reg (w) ModRM:r/m (r) NA NA

Description

Converts packed unsigned doubleword integers in the source operand (second operand) to packed double-preci-sion 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[MAX_VL-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[MAX_VL-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.

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모두의 코드 VCVTUDQ2PD (Intel x86/64 assembly instruction)