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HarshitParkar6677

This document describes the Jcc family of conditional jump instructions in x86 assembly language. It provides the instruction name, description of the condition tested, and any alternative mnemonics or opposite instructions. The instructions test various CPU flags like carry, zero, sign, overflow, parity, and compare values based on signed or unsigned arithmetic.

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Jcc Instructions That Test Flags Instruction Description Condition Aliases Opposite JC Jump if carry Carry = 1 JB, JNAE JNC JNC Jump if no carry Carry = 0 JNB, JAE JC JZ Jump if zero Zero = 1 JE JNZ JNZ Jump if not zero Zero = 0 JNE JZ JS Jump if sign Sign = 1 - JNS JNS Jump if no sign Sign = 0 - JS JO Jump if overflow Ovrflw=1 - JNO JNO Jump if no Ovrflw Ovrflw=0 - JO JP Jump if parity Parity = 1 JPE JNP JPE Jump if parity even Parity = 1 JP JPO JNP Jump if no parity Parity = 0 JPO JP JPO Jump if parity odd Parity = 0 JNP JPE Jcc Instructions for Unsigned Comparisons Instruction Description Condition Aliases Opposite JA Jump if above (>) Carry=0, Zero=0 JNBE JNA JNBE Jump if not below or equal (not <=) Carry=0, Zero=0 JA JBE JAE Jump if above or equal (>=) Carry = 0 JNC, JNB JNAE JNB Jump if not below (not <) Carry = 0 JNC, JAE JB JB Jump if below (<) Carry = 1 JC, JNAE JNB JNAE Jump if not above or equal (not >=) Carry = 1 JC, JB JAE JBE Jump if below or equal (<=) Carry = 1 or Zero = 1 JNA JNBE JNA Jump if not above (not >) Carry = 1 or Zero = 1 JBE JA JE Jump if equal (=) Zero = 1 JZ JNE JNE Jump if not equal () Zero = 0 JNZ JE Jcc Instructions for Signed Comparisons Instruction Description Condition AliasesOpposite JG Jump if greater (>) Sign = Ovrflw or Zero=0 JNLE JNG
JNLE Jump if not less than or equal (not <=) Sign = Ovrflw or Zero=0 JG JLE JGE Jump if greater than or equal (>=) Sign = Ovrflw JNL JGE JNL Jump if not less than (not <) Sign = Ovrflw JGE JL JL Jump if less than (<) Sign Ovrflw JNGE JNL JNGE Jump if not greater or equal (not >=) Sign Ovrflw JL JGE JLE Jump if less than or equal (<=) Sign Ovrflw or Zero = 1 JNG JNLE JNG Jump if not greater than (not >) Sign Ovrflw or Zero = 1 JLE JG JE Jump if equal (=) Zero = 1 JZ JNE JNE Jump if not equal () Zero = 0 JNZ JE

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  • 1. Jcc Instructions That Test Flags Instruction Description Condition Aliases Opposite JC Jump if carry Carry = 1 JB, JNAE JNC JNC Jump if no carry Carry = 0 JNB, JAE JC JZ Jump if zero Zero = 1 JE JNZ JNZ Jump if not zero Zero = 0 JNE JZ JS Jump if sign Sign = 1 - JNS JNS Jump if no sign Sign = 0 - JS JO Jump if overflow Ovrflw=1 - JNO JNO Jump if no Ovrflw Ovrflw=0 - JO JP Jump if parity Parity = 1 JPE JNP JPE Jump if parity even Parity = 1 JP JPO JNP Jump if no parity Parity = 0 JPO JP JPO Jump if parity odd Parity = 0 JNP JPE Jcc Instructions for Unsigned Comparisons Instruction Description Condition Aliases Opposite JA Jump if above (>) Carry=0, Zero=0 JNBE JNA JNBE Jump if not below or equal (not <=) Carry=0, Zero=0 JA JBE JAE Jump if above or equal (>=) Carry = 0 JNC, JNB JNAE JNB Jump if not below (not <) Carry = 0 JNC, JAE JB JB Jump if below (<) Carry = 1 JC, JNAE JNB JNAE Jump if not above or equal (not >=) Carry = 1 JC, JB JAE JBE Jump if below or equal (<=) Carry = 1 or Zero = 1 JNA JNBE JNA Jump if not above (not >) Carry = 1 or Zero = 1 JBE JA JE Jump if equal (=) Zero = 1 JZ JNE JNE Jump if not equal () Zero = 0 JNZ JE Jcc Instructions for Signed Comparisons Instruction Description Condition AliasesOpposite JG Jump if greater (>) Sign = Ovrflw or Zero=0 JNLE JNG
  • 2. JNLE Jump if not less than or equal (not <=) Sign = Ovrflw or Zero=0 JG JLE JGE Jump if greater than or equal (>=) Sign = Ovrflw JNL JGE JNL Jump if not less than (not <) Sign = Ovrflw JGE JL JL Jump if less than (<) Sign Ovrflw JNGE JNL JNGE Jump if not greater or equal (not >=) Sign Ovrflw JL JGE JLE Jump if less than or equal (<=) Sign Ovrflw or Zero = 1 JNG JNLE JNG Jump if not greater than (not >) Sign Ovrflw or Zero = 1 JLE JG JE Jump if equal (=) Zero = 1 JZ JNE JNE Jump if not equal () Zero = 0 JNZ JE