1 #include <assert.h> 2 #include <stdlib.h> 3 #include <stdio.h> 4 #include "opcodes.h" 5 6 /* Basic test that we can set the rounding mode in the FPC and 7 query it. Covers only generally available rounding modes. */ 8 9 void 10 set_rounding_mode(unsigned mode) 11 { 12 register unsigned r asm("1") = mode; 13 __asm__ volatile ( SFPC(1) : : "d"(r) ); 14 } 15 16 unsigned 17 get_rounding_mode(void) 18 { 19 unsigned fpc; 20 21 __asm__ volatile ("stfpc %0\n\t" : "=m"(fpc)); 22 23 return fpc & 0x7; 24 } 25 26 27 int main(void) 28 { 29 int i; 30 const unsigned rmodes[] = { 0, 1, 2, 3 }; 31 32 printf("initial rounding mode: %u\n", get_rounding_mode()); 33 34 for (i = 0; i < sizeof rmodes / sizeof rmodes[0]; ++i) { 35 printf("setting rounding mode to %u\n", rmodes[i]); 36 set_rounding_mode(rmodes[i]); 37 printf("...checking: %u\n", get_rounding_mode()); 38 } 39 40 return 0; 41 } 42
