What is difference between SHR and SAR?
What is difference between SHR and SAR?
SAR and SHR shift the bits of the operand downward. The effect is to divide the operand by 2. SAR performs a signed divide with rounding toward negative infinity (not the same as IDIV); the high-order bit remains the same. SHR performs an unsigned divide; the high-order bit is set to 0.
How does SAR work in assembly?
SAR (Shift Arithmetic Right) performs a right arithmetic shift on its operand. The ROL instruction shifts each bit to the left, with the highest bit copied in the Carry flag and into the lowest bit. The ROR instruction shifts each bit to the right, with the lowest bit copied in the Carry flag and into the highest bit.
What is SALQ Assembly?
salq is a shift-left operation. Basically it’s taking a binary number (y) and shifting all it’s bits to the left, thereby making it’s least significant bit into it’s most significant bit.
What does SHR do in assembly?
The SHR (shift right) instruction performs a logical right shift on the destination operand. The highest bit position is filled with a zero.
What does JG do in assembly?
The command JG simply means: Jump if Greater.
What is rip in assembly?
The instruction pointer register (%rip) points to the next instruction to execute; it cannot be directly accessed by the programmer, but is heavily used as the base for position-independent code addressing.
What does SHL mean in assembly?
shift left
The SHL (shift left) instruction performs a logical left shift on the destination operand, filling the lowest bit with 0.
How does CDQ work?
The CDQ instruction copies the sign (bit 31) of the value in the EAX register into every bit position in the EDX register. The CWD instruction is intended for use when the operand-size attribute is 16 and the CDQ instruction for when the operand-size attribute is 32.
How does SHR work x86?
The shr or sar instruction is used to shift the bits of the operand destination to the right, by the number of bits specified in the count operand. Bits shifted beyond the destination are first shifted into the CF flag.
What is the use of SHR in C?
Description The shr or sar instruction is used to shift the bits of the operand destination to the right, by the number of bits specified in the count operand. Bits shifted beyond the destination are first shifted into the CF flag. Equivalent to dividing by 2 3
What is the difference between SAR and SHR instructions?
The shift arithmetic right (SAR) and shift logical right (SHR) instructions shift the bits of the destination operand to the right (toward less significant bit locations).
What does SHR mean on ASM?
What does SHR on ASM mean. Initially CL was 0x2A after being SHR it became 0x15. google.com/search?q=what+is+shr+in+assembly – First link. “shr right shifts (unsigned divides) a byte, word, or long value for a count specified by an immediate value and stores the quotient in that byte, word, or long respectively.”.
What is the SAR instruction in Intel® 64?
In effect, the SAR instruction fills the empty bit position’s shifted value with the sign of the unshifted value (see Figure 7-9 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1 ). The SAR and SHR instructions can be used to perform signed or unsigned division, respectively, of the destination operand by powers of 2.
