39 lines
823 B
Text
39 lines
823 B
Text
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# Execution begins at address 0
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.pos 0
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irmovq stack, %rsp # Set up stack pointer
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call main # Execute main program
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halt # Terminate program
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# Array of 4 elements
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.align 8
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array: .quad 0x000d000d000d
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.quad 0x00c000c000c0
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.quad 0x0b000b000b00
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.quad 0xa000a000a000
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main: irmovq array,%rdi
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irmovq $4,%rsi
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call sum # sum(array, 4)
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ret
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/* $begin sumi-ys */
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# long sum(long *start, long count)
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# start in %rdi, count in %rsi
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sum:
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xorq %rax,%rax # sum = 0
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andq %rsi,%rsi # Set condition codes
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jmp test
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loop:
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mrmovq (%rdi),%r10 # Get *start
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addq %r10,%rax # Add to sum
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iaddq $8,%rdi # start++
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iaddq $-1,%rsi # count--
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test:
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jne loop # Stop when 0
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ret
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/* $end sumi-ys */
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# The stack starts here and grows to lower addresses
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.pos 0x100
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stack:
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