40 lines
639 B
ArmAsm
40 lines
639 B
ArmAsm
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#
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.sect .text; .sect .rom; .sect .data; .sect .bss
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/*
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* 64-big unsigned tristate comparison.
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* Inputs:
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* r2r3: left
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* r4r5: right
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* Outputs;
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* r2: result
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*/
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.sect .text
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.define .compareul
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.compareul:
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/* Compare high words. */
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sltu at, r3, r5 ! if r3<r5, then 1
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subu at, zero, at ! if r3<r5, then -1
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bne at, zero, exit
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nop
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sltu at, r5, r3 ! if r3>r5, then 1
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bne at, zero, exit
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nop
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/* High words are equal --- compare low words. */
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sltu at, r2, r4 ! if r2<r4, then 1
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subu at, zero, at ! if r2<r4, then -1
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bne at, zero, exit
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nop
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sltu at, r4, r2 ! if r2>r4, then 1
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exit:
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mov r2, at
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jr ra
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nop
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