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What is x86 TEST?
In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF , ZF , PF are modified while the result of the AND is discarded. The OF and CF flags are set to 0 , while AF flag is undefined.
What is the difference between TEST AND cmp?
The TEST instruction performs an implied AND operation between corresponding bits in the two operands and sets the flags without modifying either operand. reg, mem, and immed can be 8, 16, or 32 bits. The CMP instruction sets the flags as if it had performed subtraction on the operand.
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What does x86 call do?
The call instruction is used to call a function. The CALL instruction performs two operations: It pushes the return address (address immediately after the CALL instruction) on the stack. It changes EIP to the call destination.
How does TEST set the zero flag?
TEST sets the zero flag, ZF , when the result of the AND operation is zero. If two operands are equal, their bitwise AND is zero when both are zero. TEST also sets the sign flag, SF , when the most significant bit is set in the result, and the parity flag, PF , when the number of set bits is even.
What does Cmovns do?
cmovns is CMOVcc instruction, The cmovns conditional move if not sign check the state of SF. If SF=0 then condition is satisfied, otherwise it will be skipped.
What is SHL in assembly language?
The SHL (shift left) instruction performs a logical left shift on the destination operand, filling the lowest bit with 0.
Is cmp faster than test?
test is shorter to encode than cmp with immediate 0, in all cases except the cmp al, imm8 special case which is still two bytes.
See some more details on the topic x86 test here:
TEST (x86 instruction) – Wikipedia
In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF , ZF , PF are modified while the result of the AND …
TEST: Logical Compare (x86 Instruction Set Reference) – c9x.me
x86 Instruction Set Reference. TEST. Logical Compare … A8 ib, TEST AL,imm8, AND imm8 with AL; set SF, ZF, PF according to result. A9 iw, TEST AX,imm16 …
assembly – What does the `TEST` instruction do – Reverse …
1. TEST. According to the x86 Instruction Set Reference entry for TEST found at http://x86.renejeschke.de/,. TEST. [TEST] computes the …
TEST (x86 instruction) – Academic Dictionaries and …
In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. … There are 9 different opcodes for the TEST instruction depending.
What is Lea Assembly?
lea — Load effective address. The lea instruction places the address specified by its first operand into the register specified by its second operand. Note, the contents of the memory location are not loaded, only the effective address is computed and placed into the register.
How does cmp work Assembly?
The CMP instruction compares two operands. It is generally used in conditional execution. This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It does not disturb the destination or source operands.
What is EBP register?
A frame pointer (the ebp register on intel x86 architectures, rbp on 64-bit architectures) contains the base address of the function’s frame. The code to access local variables within a function is generated in terms of offsets to the frame pointer.
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What does Pop do assembly?
The pop instruction removes the 4-byte data element from the top of the hardware-supported stack into the specified operand (i.e. register or memory location). It first moves the 4 bytes located at memory location [SP] into the specified register or memory location, and then increments SP by 4.
What is Assembly call?
The call instruction calls near procedures using a full pointer. call causes the procedure named in the operand to be executed. When the called procedure completes, execution flow resumes at the instruction following the call instruction (see the return instruction).
What flag does je check?
The je instruction then uses the ZERO flag to decide to jump or continue. The code above is used to check if cx is zero or not. If cx is zero, test will set zero flag, then je will cause to jump to some place; If cx is not zero, test will not set zero flag, je will continue to execute the instruction that follows.
What does Movslq mean in assembly?
MOVSLQ is move and sign-extend a value from a 32-bit source to a 64-bit destination. MOVSLQ is move and sign-extend a value from a 32-bit source to a 64-bit destination.
What does SAR do 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 Cmovge?
cmovge is CMOVcc instruction, The cmovge conditional move if greater or equal check the state of SF AND OF. If SF=OF then condition is satisfied, otherwise it will be skipped.
What does set do in assembly?
The processor instruction set provides the instructions AND, OR, XOR, TEST, and NOT Boolean logic, which tests, sets, and clears the bits according to the need of the program. Sr.No. The first operand in all the cases could be either in register or in memory.
What is SHL in microprocessor?
SHL (Shift Left) Instruction, SAL (Shift Arithmetic Left) Instruction, SHR (Shift Right) Instruction, SAR (Shift Arithmetic Right) Instruction.
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What is the difference between SAL and SHL?
According to this, they are the same: The shift arithmetic left (SAL) and shift logical left (SHL) instructions perform the same operation; they shift the bits in the destination operand to the left (toward more significant bit locations).
What is difference between SHR and SAR?
sar rounds toward negative infinity; the high-order bit remains unchanged. 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.
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