79 lines
1.1 KiB
C
79 lines
1.1 KiB
C
#include <u.h>
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#include <lib9.h>
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#define DPRECSTR "0.0000004000000000125"
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#define DPREC 0.0000004000000000125
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#define DIEEELO 0x9ac0499f
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#define DIEEEHI 0x3e9ad7f2
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jmp_buf errj;
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char *err;
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void
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catcher(void *u, char *s)
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{
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err = 0;
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if(strncmp(s, "sys: fp:", 8) == 0){
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err = s;
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notejmp(u, errj, 0);
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}
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sys_noted(NDFLT);
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}
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void
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tstdiv(double p)
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{
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double r = 1.0;
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r /= p;
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fprint(2, "1/%0.20g = %0.20g\n", p, r);
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}
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typedef union I2UL
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{
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int d[2];
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unsigned long l;
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}I2UL;
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typedef union D2UL
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{
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double d;
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unsigned long l;
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}D2UL;
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void
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main(void)
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{
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double p = DPREC;
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int d[2] = { DIEEELO, DIEEEHI };
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I2UL i2l;
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D2UL d2l;
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uint64_t dieee, q;
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i2l.d[0] = d[0];
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i2l.d[1] = d[1];
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dieee = i2l.l;
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d2l.d = p;
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q = d2l.l;
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err = 0;
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sys_notify(catcher);
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setjmp(errj);
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if(err){
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fprint(2, "FAIL: %s\n", err);
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exits("FAIL");
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}
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fprint(2, "Double-precision test number: %s\n", DPRECSTR);
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fprint(2, "Expected internal representation: %ullx\n", dieee);
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fprint(2, "Actual internal representation: %ullx\n", q);
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if(q != dieee) {
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print("FAIL\n");
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exits("FAIL");
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}
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tstdiv(p);
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print("PASS\n");
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exits("PASS");
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}
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