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/*************************** print_hexadecimal_light.as **********************
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* Author: Agner Fog
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* date created: 2021-05-16
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* Last modified: 2021-05-16
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* Version: 1.11
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* Project: ForwardCom library libc_light.li
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* Description: puts: print a string to stdout. Does not append linefeed
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* This version is for CPUs with limited capabilities
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* C declaration: void print_hexadecimal(uint64_t h);
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*
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* Copyright 2021 GNU General Public License http://www.gnu.org/licenses
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******************************************************************************/
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code section execute align = 4 // code section
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// Print a hexadecimal number to stdout
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_print_hexadecimal function public reguse=3,0
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// save r2-r3
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int64 sp -= 2*8
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int64 [sp] = r2
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int64 [sp+8] = r3
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int64 r1 = bitscan(r0, 1) // find number of bits
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uint32 r1 >>= 2
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uint32 r1++ // number of digits to print
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if (int r1 > 8) { // must use 64 bits
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int r2 = 16 - r1 // number of digits to skip
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int r2 <<= 2 // number of bits to skip
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uint64 r0 <<= r2 // remove leading zeroes
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for (int ; r1 > 0; r1--) { // loop r1 times
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uint64 r0 = rotate(r0, 4) // get digit into low position
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int r2 = r0 & 0xF // get digit
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int r2 += '0' // convert to ASCII
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int r3 = r2 > '9' // digit is A - F
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int r2 = r3 ? r2 + 7 : r2 // add 7 to get letter
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int8 output(r2, r2, 10); // output digit
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}
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}
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else { // use 32 bits. CPU may not support 64 bits
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int r2 = 8 - r1 // number of digits to skip
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int r2 <<= 2 // number of bits to skip
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uint32 r0 <<= r2 // remove leading zeroes
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for (int ; r1 > 0; r1--) { // loop r1 times
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uint32 r0 = rotate(r0, 4) // get digit into low position
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int r2 = r0 & 0xF // get digit
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int r2 += '0' // convert to ASCII
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int r3 = r2 > '9' // digit is A - F
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int r2 = r3 ? r2 + 7 : r2 // add 7 to get letter
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int8 output(r2, r2, 10); // output digit
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}
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}
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// restore r2-r3
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int64 r2 = [sp]
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int64 r3 = [sp+8]
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int64 sp += 2*8
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return
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_print_hexadecimal end
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code end
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