RORX (Intel x86/64 assembly instruction)

모두의 코드
RORX (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 690 번 읽혔습니다.

RORX

Rotate Right Logical Without Affecting Flags

참고 사항

아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.

Opcode/ Instruction	Op/ En	64/32 -bit Mode	CPUID Feature Flag	Description
`VEX.LZ.F2.0F3A.W0 F0 /r ib` RORX r32 r/m32 imm8	RMI	V/V	BMI2	Rotate 32-bit r/m32 right imm8 times without affecting arithmetic flags.
`VEX.LZ.F2.0F3A.W1 F0 /r ib` RORX r64 r/m64 imm8	RMI	V/N.E.	BMI2	Rotate 64-bit r/m64 right imm8 times without affecting arithmetic flags.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RMI	ModRM:reg (w)	ModRM:r/m (r)	Imm8	NA

Description

Rotates the bits of second operand right by the count value specified in imm8 without affecting arithmetic flags. The RORX instruction does not read or write the arithmetic flags.

This instruction is not supported in real mode and virtual-8086 mode. The operand size is always 32 bits if not in 64-bit mode. In 64-bit mode operand size 64 requires VEX.W1. VEX.W1 is ignored in non-64-bit modes. An attempt to execute this instruction with VEX.L not equal to 0 will cause #UD.

Operation

IF (OperandSize = 32)
    y <- imm8 AND 1FH;
    DEST <- (SRC >> y) | (SRC << (32-y));
ELSEIF (OperandSize = 64 ) 
    y <- imm8 AND 3FH;
    DEST <- (SRC >> y) | (SRC << (64-y));
ENDIF

Flags Affected

None

Intel C/C++ Compiler Intrinsic Equivalent

Auto - generated from high - level language.

SIMD Floating-Point Exceptions

None

Other Exceptions

See Section 2.5.1, "Exception Conditions for VEX-Encoded GPR Instructions", Table 2-29; additionally

#UD If VEX.W = 1.

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모두의 코드 RORX (Intel x86/64 assembly instruction)