VCVTUDQ2PS (Intel x86/64 assembly instruction)

모두의 코드
VCVTUDQ2PS (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 511 번 읽혔습니다.

VCVTUDQ2PS

Convert Packed Unsigned Doubleword Integers to Packed Single-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.F2.0F.W0 7A /r` VCVTUDQ2PS xmm1 {k1}{z} xmm2/m128/m32bcst	FV	V/V	AVX512VL AVX512F	Convert four packed unsigned doubleword integers from xmm2/m128/m32bcst to packed single-precision floating-point values in xmm1 with writemask k1.
`EVEX.256.F2.0F.W0 7A /r` VCVTUDQ2PS ymm1 {k1}{z} ymm2/m256/m32bcst	FV	V/V	AVX512VL AVX512F	Convert eight packed unsigned doubleword integers from ymm2/m256/m32bcst to packed single-precision floating-point values in zmm1 with writemask k1.
`EVEX.512.F2.0F.W0 7A /r` VCVTUDQ2PS zmm1 {k1}{z} zmm2/m512/m32bcst{er}	FV	V/V	AVX512F	Convert sixteen packed unsigned doubleword integers from zmm2/m512/m32bcst to sixteen packed single-precision floating-point values in zmm1 with 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 packed unsigned doubleword integers in the source operand (second operand) to single-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 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

VCVTUDQ2PS (EVEX encoded version) when src operand is a register

(KL, VL) = (4, 128), (8, 256), (16, 512)
IF (VL = 512) AND (EVEX.b = 1) 
    THEN
          SET_RM(EVEX.RC);
    ELSE 
          SET_RM(MXCSR.RM);
FI;
FOR j <-  0 TO KL-1
    i <-  j * 32
    IF k1[j] OR *no writemask*
          THEN DEST[i+31:i] <-
                Convert_UInteger_To_Single_Precision_Floating_Point(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

VCVTUDQ2PS (EVEX encoded version) 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_UInteger_To_Single_Precision_Floating_Point(SRC[31:0])
                      ELSE 
                            DEST[i+31:i] <-
                Convert_UInteger_To_Single_Precision_Floating_Point(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

VCVTUDQ2PS __m512 _mm512_cvtepu32_ps(__m512i a);
VCVTUDQ2PS __m512 _mm512_mask_cvtepu32_ps(__m512 s, __mmask16 k, __m512i a);
VCVTUDQ2PS __m512 _mm512_maskz_cvtepu32_ps(__mmask16 k, __m512i a);
VCVTUDQ2PS __m512 _mm512_cvt_roundepu32_ps(__m512i a, int r);
VCVTUDQ2PS __m512 _mm512_mask_cvt_roundepu32_ps(__m512 s, __mmask16 k,
                                                __m512i a, int r);
VCVTUDQ2PS __m512 _mm512_maskz_cvt_roundepu32_ps(__mmask16 k, __m512i a, int r);
VCVTUDQ2PS __m256 _mm256_cvtepu32_ps(__m256i a);
VCVTUDQ2PS __m256 _mm256_mask_cvtepu32_ps(__m256 s, __mmask8 k, __m256i a);
VCVTUDQ2PS __m256 _mm256_maskz_cvtepu32_ps(__mmask8 k, __m256i a);
VCVTUDQ2PS __m128 _mm_cvtepu32_ps(__m128i a);
VCVTUDQ2PS __m128 _mm_mask_cvtepu32_ps(__m128 s, __mmask8 k, __m128i a);
VCVTUDQ2PS __m128 _mm_maskz_cvtepu32_ps(__mmask8 k, __m128i a);

SIMD Floating-Point Exceptions

Precision

Other Exceptions

EVEX-encoded instructions, see Exceptions Type E2.

#UD If EVEX.vvvv != 1111B.

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모두의 코드 VCVTUDQ2PS (Intel x86/64 assembly instruction)