VCVTUSI2SS (Intel x86/64 assembly instruction)

모두의 코드
VCVTUSI2SS (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 676 번 읽혔습니다.

VCVTUSI2SS

Convert Unsigned Integer to Scalar Single-Precision Floating-Point Value

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.NDS.LIG.F3.0F.W0 7B /r` VCVTUSI2SS xmm1 xmm2 r/m32{er}	T1S	V/V	AVX512F	Convert one signed doubleword integer from r/m32 to one single-precision floating-point value in xmm1.
`EVEX.NDS.LIG.F3.0F.W1 7B /r` VCVTUSI2SS xmm1 xmm2 r/m64{er}	T1S	V/N.E.¹	AVX512F	Convert one signed quadword integer from r/m64 to one single-precision floating-point value in xmm1.

For this specific instruction, EVEX.W in non-64 bit is ignored; the instructions behaves as if the W0 version isused

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
T1S	ModRM:reg (w)	VEX.vvvv	ModRM:r/m (r)	NA

Description

Converts a unsigned doubleword integer (or unsigned quadword integer if operand size is 64 bits) in the source operand (second operand) to a single-precision floating-point value in the destination operand (first operand). The source operand can be a general-purpose register or a memory location. The destination operand is an XMM register. The result is stored in the low doubleword of the destination operand. When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register or the embedded rounding control bits.

The second source operand can be a general-purpose register or a 32/64-bit memory location. The first source and destination operands are XMM registers. Bits (127:32) of the XMM register destination are copied from corre-sponding bits in the first source operand. Bits (MAXVL-1:128) of the destination register are zeroed.

EVEX.W1 version: promotes the instruction to use 64-bit input value in 64-bit mode.

Operation

VCVTUSI2SS (EVEX encoded version)

IF (SRC2 *is register*) AND (EVEX.b = 1) 
    THEN
          SET_RM(EVEX.RC);
    ELSE 
          SET_RM(MXCSR.RM);
FI;
IF 64-Bit Mode And OperandSize = 64
THEN
    DEST[31:0] <-  Convert_UInteger_To_Single_Precision_Floating_Point(SRC[63:0]);
ELSE
    DEST[31:0] <-  Convert_UInteger_To_Single_Precision_Floating_Point(SRC[31:0]);
FI;
DEST[127:32] <-  SRC1[127:32]
DEST[MAX_VL-1:128] <-  0

Intel C/C++ Compiler Intrinsic Equivalent

VCVTUSI2SS __m128 _mm_cvtu32_ss(__m128 s, unsigned a);
VCVTUSI2SS __m128 _mm_cvt_roundu32_ss(__m128 s, unsigned a, int r);
VCVTUSI2SS __m128 _mm_cvtu64_ss(__m128 s, unsigned __int64 a);
VCVTUSI2SS __m128 _mm_cvt_roundu64_ss(__m128 s, unsigned __int64 a, int r);

SIMD Floating-Point Exceptions

Precision

Other Exceptions

See Exceptions Type E3NF.

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모두의 코드 VCVTUSI2SS (Intel x86/64 assembly instruction)