Why aarch64 and x86 not support conditional execution like before?

Why aarch64 and x86 not support conditional execution like before?

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  • From the Armv8-A programming guide:
    6.2.5 Conditional instructions
    The A64 instruction set does not support conditional execution for every instruction. Predicated
    execution of instructions does not offer sufficient benefit to justify its significant use of opcode
    space.

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  • From the Armv8-A programming guide:
    6.2.5 Conditional instructions
    The A64 instruction set does not support conditional execution for every instruction. Predicated
    execution of instructions does not offer sufficient benefit to justify its significant use of opcode
    space.

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