VCVTTPS2UDQ (Intel x86/64 assembly instruction)

모두의 코드
VCVTTPS2UDQ (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 541 번 읽혔습니다.

VCVTTPS2UDQ

Convert with Truncation Packed Single-Precision Floating-Point Values to Packed Unsigned Doubleword Integer 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.128.0F.W0 78 /r` VCVTTPS2UDQ xmm1 {k1}{z} xmm2/m128/m32bcst	FV	V/V	AVX512VL AVX512F	Convert four packed single precision floating-point values from xmm2/m128/m32bcst to four packed unsigned doubleword values in xmm1 using truncation subject to writemask k1.
`EVEX.256.0F.W0 78 /r` VCVTTPS2UDQ ymm1 {k1}{z} ymm2/m256/m32bcst	FV	V/V	AVX512VL AVX512F	Convert eight packed single precision floating-point values from ymm2/m256/m32bcst to eight packed unsigned doubleword values in ymm1 using truncation subject to writemask k1.
`EVEX.512.0F.W0 78 /r` VCVTTPS2UDQ zmm1 {k1}{z} zmm2/m512/m32bcst{sae}	FV	V/V	AVX512F	Convert sixteen packed single-precision floating-point values from zmm2/m512/m32bcst to sixteen packed unsigned doubleword values in zmm1 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 single-precision floating-point values in the source operand to sixteen unsigned doubleword integers in the destination operand.

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR. 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.

EVEX encoded versions: 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 32-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

VCVTTPS2UDQ (EVEX encoded versions) when src operand is a register

(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j <-  0 TO KL-1
    i <-  j * 32
    IF k1[j] OR *no writemask*
          THEN DEST[i+31:i] <-
                Convert_Single_Precision_Floating_Point_To_UInteger_Truncate(SRC[i+31:i])
          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] <-  0

VCVTTPS2UDQ (EVEX encoded versions) when src operand is a memory source

(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j <-  0 TO KL-1
    i <-  j * 32
    IF k1[j] OR *no writemask*
          THEN 
                IF (EVEX.b = 1) 
                      THEN
                            DEST[i+31:i] <-
                Convert_Single_Precision_Floating_Point_To_UInteger_Truncate(SRC[31:0])
                      ELSE 
                            DEST[i+31:i] <-
                Convert_Single_Precision_Floating_Point_To_UInteger_Truncate(SRC[i+31:i])
                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] <-  0

Intel C/C++ Compiler Intrinsic Equivalent

VCVTTPS2UDQ __m512i _mm512_cvttps_epu32(__m512 a);
VCVTTPS2UDQ __m512i _mm512_mask_cvttps_epu32(__m512i s, __mmask16 k, __m512 a);
VCVTTPS2UDQ __m512i _mm512_maskz_cvttps_epu32(__mmask16 k, __m512 a);
VCVTTPS2UDQ __m512i _mm512_cvtt_roundps_epu32(__m512 a, int sae);
VCVTTPS2UDQ __m512i _mm512_mask_cvtt_roundps_epu32(__m512i s, __mmask16 k,
                                                   __m512 a, int sae);
VCVTTPS2UDQ __m512i _mm512_maskz_cvtt_roundps_epu32(__mmask16 k, __m512 a,
                                                    int sae);
VCVTTPS2UDQ __m256i _mm256_mask_cvttps_epu32(__m256i s, __mmask8 k, __m256 a);
VCVTTPS2UDQ __m256i _mm256_maskz_cvttps_epu32(__mmask8 k, __m256 a);
VCVTTPS2UDQ __m128i _mm_mask_cvttps_epu32(__m128i s, __mmask8 k, __m128 a);
VCVTTPS2UDQ __m128i _mm_maskz_cvttps_epu32(__mmask8 k, __m128 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 VCVTTPS2UDQ (Intel x86/64 assembly instruction)