DIVSD (Intel x86/64 assembly instruction)

모두의 코드
DIVSD (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 1026 번 읽혔습니다.

DIVSD

Divide Scalar Double-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
`F2 0F 5E /r` DIVSD xmm1 xmm2/m64	RM	V/V	SSE2	Divide low double-precision floating-point value in xmm1 by low double-precision floating-point value in xmm2/m64.
`VEX.NDS.128.F2.0F.WIG 5E /r` VDIVSD xmm1 xmm2 xmm3/m64	RVM	V/V	AVX	Divide low double-precision floating-point value in xmm2 by low double-precision floating-point value in xmm3/m64.
`EVEX.NDS.LIG.F2.0F.W1 5E /r` VDIVSD xmm1 {k1}{z} xmm2 xmm3/m64{er}	T1S	V/V	AVX512F	Divide low double-precision floating-point value in xmm2 by low double-precision floating-point value in xmm3/m64.

Instruction Operand Encoding

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

Description

Divides the low double-precision floating-point value in the first source operand by the low double-precision floating-point value in the second source operand, and stores the double-precision floating-point result in the desti-nation operand. The second source operand can be an XMM register or a 64-bit memory location. The first source and destination are XMM registers.

128-bit Legacy SSE version: The first source operand and the destination operand are the same. Bits (MAXVL-1:64) of the corresponding ZMM destination register remain unchanged.

VEX.128 encoded version: The first source operand is an xmm register encoded by VEX.vvvv. The quadword at bits 127:64 of the destination operand is copied from the corresponding quadword of the first source operand. Bits (MAXVL-1:128) of the destination register are zeroed.

EVEX.128 encoded version: The first source operand is an xmm register encoded by EVEX.vvvv. The quadword element of the destination operand at bits 127:64 are copied from the first source operand. Bits (MAXVL-1:128) of the destination register are zeroed.

EVEX version: The low quadword element of the destination is updated according to the writemask.

Software should ensure VDIVSD is encoded with VEX.L=0. Encoding VDIVSD with VEX.L=1 may encounter unpre-dictable behavior across different processor generations.

Operation

VDIVSD (EVEX encoded version)

IF (EVEX.b = 1) AND SRC2 *is a register*
    THEN
          SET_RM(EVEX.RC);
    ELSE 
          SET_RM(MXCSR.RM);
FI;
IF k1[0] or *no writemask*
    THEN DEST[63:0] <-  SRC1[63:0] / SRC2[63:0]
    ELSE 
          IF *merging-masking* ; merging-masking
                THEN *DEST[63:0] remains unchanged*
                ELSE  ; zeroing-masking
                      THEN DEST[63:0] <-  0
          FI;
FI;
DEST[127:64] <-  SRC1[127:64]
DEST[MAX_VL-1:128] <-  0

VDIVSD (VEX.128 encoded version)

DEST[63:0] <- SRC1[63:0] / SRC2[63:0]
DEST[127:64] <- SRC1[127:64]
DEST[MAX_VL-1:128] <- 0

DIVSD (128-bit Legacy SSE version)

DEST[63:0] <- DEST[63:0] / SRC[63:0]
DEST[MAX_VL-1:64] (Unmodified)

Intel C/C++ Compiler Intrinsic Equivalent

VDIVSD __m128d _mm_mask_div_sd(__m128d s, __mmask8 k, __m128d a, __m128d b);
VDIVSD __m128d _mm_maskz_div_sd(__mmask8 k, __m128d a, __m128d b);
VDIVSD __m128d _mm_div_round_sd(__m128d a, __m128d b, int);
VDIVSD __m128d _mm_mask_div_round_sd(__m128d s, __mmask8 k, __m128d a,
                                     __m128d b, int);
VDIVSD __m128d _mm_maskz_div_round_sd(__mmask8 k, __m128d a, __m128d b, int);
DIVSD __m128d _mm_div_sd(__m128d a, __m128d b);

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Divide-by-Zero, Precision, Denormal

Other Exceptions

VEX-encoded instructions, see Exceptions Type 3.

EVEX-encoded instructions, see Exceptions Type E3.

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모두의 코드 DIVSD (Intel x86/64 assembly instruction)