VCVTTPD2UDQ (Intel x86/64 assembly instruction)

모두의 코드
VCVTTPD2UDQ (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 519 번 읽혔습니다.

VCVTTPD2UDQ

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

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.128.0F.W1 78 /rVCVTTPD2UDQ xmm1 {k1}{z}, xmm2/m128/m64bcst	FV	V/V	AVX512VL AVX512F	Convert two packed double-precision floating-point values in xmm2/m128/m64bcst to two unsigned doubleword integers in xmm1 using truncation subject to writemask k1.
EVEX.256.0F.W1 78 02 /rVCVTTPD2UDQ xmm1 {k1}{z}, ymm2/m256/m64bcst	FV	V/V	AVX512VL AVX512F	Convert four packed double-precision floating-point values in ymm2/m256/m64bcst to four unsigned doubleword integers in xmm1 using truncation subject to writemask k1.
EVEX.512.0F.W1 78 /rVCVTTPD2UDQ ymm1 {k1}{z}, zmm2/m512/m64bcst{sae}	FV	V/V	AVX512F	Convert eight packed double-precision floating-point values in zmm2/m512/m64bcst to eight unsigned doubleword integers in ymm1 using truncation subject to 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 with truncation packed double-precision floating-point values in the source operand (the second operand) to packed unsigned doubleword integers in the destination operand (the first operand).

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register. If a converted result cannot be represented in the destination format, the floating-point invalid exception is raised, and if this exception is masked, the integer value 2^w - 1 is returned, where w represents the number of bits in the destination format.

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 YMM/XMM/XMM (low 64 bits) register conditionally updated with writemask k1. The upper bits (MAXVL-1:256) of the corresponding destination are zeroed.

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

Operation

VCVTTPD2UDQ (EVEX encoded versions) when src2 operand is a register

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

VCVTTPD2UDQ (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 * 32
    k <-  j * 64
    IF k1[j] OR *no writemask*
          THEN 
                IF (EVEX.b = 1) 
                      THEN
                            DEST[i+31:i] <-
                Convert_Double_Precision_Floating_Point_To_UInteger_Truncate(SRC[63:0])
                      ELSE 
                            DEST[i+31:i] <-
                Convert_Double_Precision_Floating_Point_To_UInteger_Truncate(SRC[k+63:k])
                FI;
          ELSE 
                IF *merging-masking* ; merging-masking
                      THEN *DEST[i+31:i] remains unchanged*
                      ELSE  ; zeroing-masking
                            DEST[i+31:i] <-  0
                FI
    FI;
ENDFOR
DEST[MAX_VL-1:VL/2] <-  0

Intel C/C++ Compiler Intrinsic Equivalent

VCVTTPD2UDQ __m256i _mm512_cvttpd_epu32(__m512d a);
VCVTTPD2UDQ __m256i _mm512_mask_cvttpd_epu32(__m256i s, __mmask8 k, __m512d a);
VCVTTPD2UDQ __m256i _mm512_maskz_cvttpd_epu32(__mmask8 k, __m512d a);
VCVTTPD2UDQ __m256i _mm512_cvtt_roundpd_epu32(__m512d a, int sae);
VCVTTPD2UDQ __m256i _mm512_mask_cvtt_roundpd_epu32(__m256i s, __mmask8 k,
                                                   __m512d a, int sae);
VCVTTPD2UDQ __m256i _mm512_maskz_cvtt_roundpd_epu32(__mmask8 k, __m512d a,
                                                    int sae);
VCVTTPD2UDQ __m128i _mm256_mask_cvttpd_epu32(__m128i s, __mmask8 k, __m256d a);
VCVTTPD2UDQ __m128i _mm256_maskz_cvttpd_epu32(__mmask8 k, __m256d a);
VCVTTPD2UDQ __m128i _mm_mask_cvttpd_epu32(__m128i s, __mmask8 k, __m128d a);
VCVTTPD2UDQ __m128i _mm_maskz_cvttpd_epu32(__mmask8 k, __m128d a);

SIMD Floating-Point Exceptions

Invalid, Precision

Other Exceptions

EVEX-encoded instructions, see Exceptions Type E2.

#UD If EVEX.vvvv != 1111B.

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모두의 코드 VCVTTPD2UDQ (Intel x86/64 assembly instruction)