1 #include "lib9.h" 2 #include "mathi.h" 3 4 #include <stdio.h> 5 6 void 7 FPinit(void) 8 { 9 ulong fcr9 = FPPDBL|FPRNR|FPINVAL|FPZDIV|FPUNFL|FPOVFL; 10 setfsr(0); /* Clear pending exceptions */ 11 setfcr(fcr9); 12 } 13 14 ulong 15 getFPstatus(void) 16 { 17 ulong fsr = 0, fsr9 = getfsr(); 18 /* on specific machines, could be table lookup */ 19 if(fsr9&FPAINEX) fsr |= INEX; 20 if(fsr9&FPAOVFL) fsr |= OVFL; 21 if(fsr9&FPAUNFL) fsr |= UNFL; 22 if(fsr9&FPAZDIV) fsr |= ZDIV; 23 if(fsr9&FPAINVAL) fsr |= INVAL; 24 return fsr; 25 } 26 27 ulong 28 FPstatus(ulong fsr, ulong mask) 29 { 30 ulong fsr9 = 0; 31 ulong old = getFPstatus(); 32 fsr = (fsr&mask) | (old&~mask); 33 if(fsr&INEX) fsr9 |= FPAINEX; 34 if(fsr&OVFL) fsr9 |= FPAOVFL; 35 if(fsr&UNFL) fsr9 |= FPAUNFL; 36 if(fsr&ZDIV) fsr9 |= FPAZDIV; 37 if(fsr&INVAL) fsr9 |= FPAINVAL; 38 setfsr(fsr9); 39 return(old&mask); 40 } 41 42 ulong 43 getFPcontrol(void) 44 { 45 ulong fcr = 0, fcr9 = getfcr(); 46 switch(fcr9&FPRMASK){ 47 case FPRNR: fcr = RND_NR; break; 48 case FPRNINF: fcr = RND_NINF; break; 49 case FPRPINF: fcr = RND_PINF; break; 50 case FPRZ: fcr = RND_Z; break; 51 } 52 if(fcr9&FPINEX) fcr |= INEX; 53 if(fcr9&FPOVFL) fcr |= OVFL; 54 if(fcr9&FPUNFL) fcr |= UNFL; 55 if(fcr9&FPZDIV) fcr |= ZDIV; 56 if(fcr9&FPINVAL) fcr |= INVAL; 57 return fcr; 58 } 59 60 ulong 61 FPcontrol(ulong fcr, ulong mask) 62 { 63 ulong fcr9 = FPPDBL; 64 ulong old = getFPcontrol(); 65 fcr = (fcr&mask) | (old&~mask); 66 if(fcr&INEX) fcr9 |= FPINEX; 67 if(fcr&OVFL) fcr9 |= FPOVFL; 68 if(fcr&UNFL) fcr9 |= FPUNFL; 69 if(fcr&ZDIV) fcr9 |= FPZDIV; 70 if(fcr&INVAL) fcr9 |= FPINVAL; 71 switch(fcr&RND_MASK){ 72 case RND_NR: fcr9 |= FPRNR; break; 73 case RND_NINF: fcr9 |= FPRNINF; break; 74 case RND_PINF: fcr9 |= FPRPINF; break; 75 case RND_Z: fcr9 |= FPRZ; break; 76 } 77 setfcr(fcr9); 78 return(old&mask); 79 } 80