VRSQRT14SS (Intel x86/64 assembly instruction)

모두의 코드
VRSQRT14SS (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 480 번 읽혔습니다.

VRSQRT14SS

Compute Approximate Reciprocal of Square Root of Scalar Float32 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.66.0F38.W0 4F /r` VRSQRT14SS xmm1 {k1}{z} xmm2 xmm3/m32	T1S	V/V	AVX512F	Computes the approximate reciprocal square root of the scalar single-precision floating-point value in xmm3/m32 and stores the result in the low doubleword element of xmm1 using writemask k1. Bits[127:32] of xmm2 is copied to xmm1[127:32].

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

Computes of the approximate reciprocal of the square root of the scalar single-precision floating-point value in the low doubleword element of the source operand (the second operand) and stores the result in the low doubleword element of the destination operand (the first operand) according to the writemask. The maximum relative error for this approximation is less than 2^-14 . The source operand can be an XMM register or a 32-bit memory location. The destination operand is an XMM register.

Bits (127:32) of the XMM register destination are copied from corresponding bits in the first source operand. Bits (MAXVL-1:128) of the destination register are zeroed.

The VRSQRT14SS instruction is not affected by the rounding control bits in the MXCSR register. When a source value is a 0.0, an $\infty$ with the sign of the source value is returned. When the source operand is an $\infty$, zero with the sign of the source value is returned. A denormal source value is treated as zero only if DAZ bit is set in MXCSR. Otherwise it is treated correctly and performs the approximation with the specified masked response. When a source value is a negative value (other than 0.0) a floating-point indefinite is returned. When a source value is an SNaN or QNaN, the SNaN is converted to a QNaN or the source QNaN is returned.

MXCSR exception flags are not affected by this instruction and floating-point exceptions are not reported.

A numerically exact implementation of VRSQRT14xx can be found at

https://software.intel.com/en-us/arti-cles/reference-implementations-for-IA-approximation-instructions-vrcp14-vrsqrt14-vrcp28-vrsqrt28-vexp2.

Operation

VRSQRT14SS (EVEX version)

IF k1[0] or *no writemask*
    THEN DEST[31:0] <-  APPROXIMATE(1.0/ SQRT(SRC2[31:0]))
    ELSE 
          IF *merging-masking* ; merging-masking
                THEN *DEST[31:0] remains unchanged*
                ELSE  ; zeroing-masking
                      THEN DEST[31:0] <-  0
          FI;
FI;
DEST[127:32] <-  SRC1[127:32]
DEST[MAX_VL-1:128] <-  0

Table 5-26. VRSQRT14SS Special Cases

Input value	Result value	Comments
Any denormal	Normal	Cannot generate overflow
X = 2^-2n	2ⁿ
X < 0	QNaN_Indefinite	Including -INF
X = -0	-INF
X = +0	+INF
X = +INF	+0

Intel C/C++ Compiler Intrinsic Equivalent

VRSQRT14SS __m128 _mm_rsqrt14_ss(__m128 a, __m128 b);
VRSQRT14SS __m128 _mm_mask_rsqrt14_ss(__m128 s, __mmask8 k, __m128 a, __m128 b);
VRSQRT14SS __m128 _mm_maskz_rsqrt14_ss(__mmask8 k, __m128 a, __m128 b);

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type E5.

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모두의 코드 VRSQRT14SS (Intel x86/64 assembly instruction)