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