CVTDQ2PD (Intel x86/64 assembly instruction)

모두의 코드
CVTDQ2PD (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 676 번 읽혔습니다.

CVTDQ2PD

Convert Packed 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
`F3 0F E6 /r` CVTDQ2PD xmm1 xmm2/m64	RM	V/V	SSE2	Convert two packed signed doubleword integers from xmm2/mem to two packed double-precision floating-point values in xmm1.
`VEX.128.F3.0F.WIG E6 /r` VCVTDQ2PD xmm1 xmm2/m64	RM	V/V	AVX	Convert two packed signed doubleword integers from xmm2/mem to two packed double-precision floating-point values in xmm1.
`VEX.256.F3.0F.WIG E6 /r` VCVTDQ2PD ymm1 xmm2/m128	RM	V/V	AVX	Convert four packed signed doubleword integers from xmm2/mem to four packed double-precision floating-point values in ymm1.
`EVEX.128.F3.0F.W0 E6 /r` VCVTDQ2PD xmm1 {k1}{z} xmm2/m128/m32bcst	HV	V/V	AVX512VL AVX512F	Convert 2 packed signed doubleword integers from xmm2/m128/m32bcst to eight packed double-precision floating-point values in xmm1 with writemask k1.
`EVEX.256.F3.0F.W0 E6 /r` VCVTDQ2PD ymm1 {k1}{z} xmm2/m128/m32bcst	HV	V/V	AVX512VL AVX512F	Convert 4 packed signed doubleword integers from xmm2/m128/m32bcst to 4 packed double-precision floating-point values in ymm1 with writemask k1.
`EVEX.512.F3.0F.W0 E6 /r` VCVTDQ2PD zmm1 {k1}{z} ymm2/m256/m32bcst	HV	V/V	AVX512F	Convert eight packed signed 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
RM	ModRM:reg (w)	ModRM:r/m (r)	NA	NA
HV	ModRM:reg (w)	ModRM:r/m (r)	NA	NA

Description

Converts two, four or eight packed signed doubleword integers in the source operand (the second operand) to two, four or eight packed double-precision floating-point values in the destination operand (the first operand).

EVEX encoded versions: The source operand can be 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.

VEX.256 encoded version: The source operand is an XMM register or 128- bit memory location. The destination operand is a YMM register.

VEX.128 encoded version: The source operand is an XMM register or 64- bit memory location. The destination operand is a XMM register. The upper Bits (MAXVL-1:128) of the corresponding ZMM register destination are zeroed.

128-bit Legacy SSE version: The source operand is an XMM register or 64- bit memory location. The destination operand is an XMM register. The upper Bits (MAXVL-1:128) of the corresponding ZMM register destination are unmodified.

VEX.vvvv and EVEX.vvvv are reserved and must be 1111b, otherwise instructions will #UD.

Figure 3-11. CVTDQ2PD (VEX.256 encoded version)

Operation

VCVTDQ2PD (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_Integer_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

VCVTDQ2PD (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_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
                      ELSE 
                            DEST[i+63:i] <-
                Convert_Integer_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

VCVTDQ2PD (VEX.256 encoded version)

DEST[63:0] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
DEST[127:64] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32])
DEST[191:128] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[95:64])
DEST[255:192] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[127:96)
DEST[MAX_VL-1:256] <-  0

VCVTDQ2PD (VEX.128 encoded version)

DEST[63:0] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
DEST[127:64] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32])
DEST[MAX_VL-1:128] <-  0

CVTDQ2PD (128-bit Legacy SSE version)

DEST[63:0] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0])
DEST[127:64] <-  Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32])
DEST[MAX_VL-1:128] (unmodified)

Intel C/C++ Compiler Intrinsic Equivalent

VCVTDQ2PD __m512d _mm512_cvtepi32_pd(__m256i a);
VCVTDQ2PD __m512d _mm512_mask_cvtepi32_pd(__m512d s, __mmask8 k, __m256i a);
VCVTDQ2PD __m512d _mm512_maskz_cvtepi32_pd(__mmask8 k, __m256i a);
VCVTDQ2PD __m256d _mm256_mask_cvtepi32_pd(__m256d s, __mmask8 k, __m256i a);
VCVTDQ2PD __m256d _mm256_maskz_cvtepi32_pd(__mmask8 k, __m256i a);
VCVTDQ2PD __m128d _mm_mask_cvtepi32_pd(__m128d s, __mmask8 k, __m128i a);
VCVTDQ2PD __m128d _mm_maskz_cvtepi32_pd(__mmask8 k, __m128i a);
CVTDQ2PD __m256d _mm256_cvtepi32_pd(__m128i src) CVTDQ2PD __m128d
    _mm_cvtepi32_pd(__m128i src)

Other Exceptions

VEX-encoded instructions, see Exceptions Type 5;

EVEX-encoded instructions, see Exceptions Type E5.

#UD If VEX.vvvv != 1111B or EVEX.vvvv != 1111B.

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모두의 코드 CVTDQ2PD (Intel x86/64 assembly instruction)