forked from Github_Repos/cvw
199 lines
3.8 KiB
C
199 lines
3.8 KiB
C
/*
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Program: qslc_r4a2.c
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Description: Prints out Quotient Selection Table (assumes CPA is utilized to reduce memory)
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User: James E. Stine
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*/
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#include <stdio.h>
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#include <math.h>
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#define DIVISOR_SIZE 3
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#define CARRY_SIZE 7
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#define SUM_SIZE 7
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#define TOT_SIZE 7
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void disp_binary(double, int, int);
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struct bits {
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unsigned int divisor : DIVISOR_SIZE;
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int tot : TOT_SIZE;
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} pla;
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/*
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Function: disp_binary
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Description: This function displays a Double-Precision number into
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four 16 bit integers using the global union variable
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dp_number
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Argument List: double x The value to be converted
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int bits_to_left Number of bits left of radix point
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int bits_to_right Number of bits right of radix point
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Return value: none
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*/
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void disp_binary(double x, int bits_to_left, int bits_to_right) {
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int i;
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double diff;
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if (fabs(x) < pow(2.0, ((double) -bits_to_right)) ) {
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for (i = -bits_to_left + 1; i <= bits_to_right; i++) {
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printf("0");
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}
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if (i == bits_to_right+1)
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;
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return;
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}
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if (x < 0.0)
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x = pow(2.0, ((double) bits_to_left)) + x;
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for (i = -bits_to_left + 1; i <= bits_to_right; i++) {
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diff = pow(2.0, ((double) -i) );
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if (x < diff)
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printf("0");
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else {
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printf("1");
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x -= diff;
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}
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if (i == 0)
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;
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}
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}
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int main() {
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int m;
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int n;
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int o;
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pla.divisor = 0;
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pla.tot = 0;
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printf("\tcase({D[5:3],Wmsbs})\n");
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for (o=0; o < pow(2.0, DIVISOR_SIZE); o++) {
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for (m=0; m < pow(2.0, TOT_SIZE); m++) {
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printf("\t\t10'b");
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disp_binary((double) pla.divisor, DIVISOR_SIZE, 0);
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printf("_");
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disp_binary((double) pla.tot, TOT_SIZE, 0);
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printf(": q = 4'b");
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/*
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4 bits for Radix 4 (a=2)
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1000 = +2
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0100 = +1
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0000 = 0
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0010 = -1
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0001 = -2
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*/
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switch (pla.divisor) {
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case 0:
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if ((pla.tot) >= 12)
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printf("1000");
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else if ((pla.tot) >= 4)
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printf("0100");
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else if ((pla.tot) >= -4)
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printf("0000");
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else if ((pla.tot) >= -13)
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printf("0010");
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else
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printf("0001");
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break;
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case 1:
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if ((pla.tot) >= 14)
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printf("1000");
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else if ((pla.tot) >= 4)
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printf("0100");
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else if ((pla.tot) >= -6)
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printf("0000");
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else if ((pla.tot) >= -15)
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printf("0010");
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else
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printf("0001");
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break;
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case 2:
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if ((pla.tot) >= 15)
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printf("1000");
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else if ((pla.tot) >= 4)
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printf("0100");
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else if ((pla.tot) >= -6)
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printf("0000");
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else if ((pla.tot) >= -16)
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printf("0010");
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else
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printf("0001");
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break;
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case 3:
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if ((pla.tot) >= 16)
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printf("1000");
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else if ((pla.tot) >= 4)
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printf("0100");
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else if ((pla.tot) >= -6)
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printf("0000");
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else if ((pla.tot) >= -18)
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printf("0010");
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else
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printf("0001");
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break;
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case 4:
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if ((pla.tot) >= 18)
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printf("1000");
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else if ((pla.tot) >= 6)
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printf("0100");
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else if ((pla.tot) >= -8)
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printf("0000");
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else if ((pla.tot) >= -20)
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printf("0010");
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else
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printf("0001");
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break;
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case 5:
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if ((pla.tot) >= 20)
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printf("1000");
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else if ((pla.tot) >= 6)
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printf("0100");
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else if ((pla.tot) >= -8)
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printf("0000");
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else if ((pla.tot) >= -20)
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printf("0010");
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else
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printf("0001");
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break;
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case 6:
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if ((pla.tot) >= 20)
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printf("1000");
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else if ((pla.tot) >= 8)
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printf("0100");
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else if ((pla.tot) >= -8)
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printf("0000");
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else if ((pla.tot) >= -22)
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printf("0010");
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else
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printf("0001");
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break;
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case 7:
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if ((pla.tot) >= 24)
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printf("1000");
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else if ((pla.tot) >= 8)
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printf("0100");
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else if ((pla.tot) >= -8)
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printf("0000");
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else if ((pla.tot) >= -24)
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printf("0010");
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else
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printf("0001");
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break;
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default: printf ("XXX");
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}
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printf(";\n");
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(pla.tot)++;
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}
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(pla.divisor)++;
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}
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printf("\tendcase\n");
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}
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