25 lines
576 B
ArmAsm
25 lines
576 B
ArmAsm
.section .text.parse_base10
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.global _parse_base10
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_parse_base10:
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/* r8 = pointer to text ; r1 = number */
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/* return r0 = number of digits */
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mov #0,r1 /* r1: accumulated number */
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mov r8,r0 /* r0: number of digits */
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parse_base10_loop:
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mov.b @r8+,r2
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add #-48,r2 /* ascii '0' */
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cmp/pz r2 /* Rn >= 0 (signed) (r2 >= 0 ) */
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bf/s parse_base10_rts
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mov #9,r4 /* const 9 */
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cmp/ge r2,r4 /* Rn >= Rm (signed) ( 9 >= r2) */
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bf/s parse_base10_rts
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mov #10,r4 /* const 10 */
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mulu.w r1,r4
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sts macl,r1
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bra parse_base10_loop
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add r2,r1
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parse_base10_rts:
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rts
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sub r8,r0
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