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store pair

ARM64's stp and ldp, which store or load two registers at once at neighbouring addresses - ARM64's way to save and restore registers on the stack.

stp xa, xb, [sp, #-16]! stores two 64-bit registers at sp - 16 and sp - 8 and writes sp back; ldp xa, xb, [sp], #16 reloads them and pops; ARM64 has no push or pop instruction.

Examples

  • ARM64 stp x29, x30, [sp, #-16]! saves the frame pointer and the link register in one instruction.

See also

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