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Side by Side Diff: fusl/src/math/lrint.c

Issue 1714623002: [fusl] clang-format fusl (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: headers too Created 4 years, 10 months ago
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1 #include <limits.h> 1 #include <limits.h>
2 #include <fenv.h> 2 #include <fenv.h>
3 #include "libm.h" 3 #include "libm.h"
4 4
5 /* 5 /*
6 If the result cannot be represented (overflow, nan), then 6 If the result cannot be represented (overflow, nan), then
7 lrint raises the invalid exception. 7 lrint raises the invalid exception.
8 8
9 Otherwise if the input was not an integer then the inexact 9 Otherwise if the input was not an integer then the inexact
10 exception is raised. 10 exception is raised.
11 11
12 C99 is a bit vague about whether inexact exception is 12 C99 is a bit vague about whether inexact exception is
13 allowed to be raised when invalid is raised. 13 allowed to be raised when invalid is raised.
14 (F.9 explicitly allows spurious inexact exceptions, F.9.6.5 14 (F.9 explicitly allows spurious inexact exceptions, F.9.6.5
15 does not make it clear if that rule applies to lrint, but 15 does not make it clear if that rule applies to lrint, but
16 IEEE 754r 7.8 seems to forbid spurious inexact exception in 16 IEEE 754r 7.8 seems to forbid spurious inexact exception in
17 the ineger conversion functions) 17 the ineger conversion functions)
18 18
19 So we try to make sure that no spurious inexact exception is 19 So we try to make sure that no spurious inexact exception is
20 raised in case of an overflow. 20 raised in case of an overflow.
21 21
22 If the bit size of long > precision of double, then there 22 If the bit size of long > precision of double, then there
23 cannot be inexact rounding in case the result overflows, 23 cannot be inexact rounding in case the result overflows,
24 otherwise LONG_MAX and LONG_MIN can be represented exactly 24 otherwise LONG_MAX and LONG_MIN can be represented exactly
25 as a double. 25 as a double.
26 */ 26 */
27 27
28 #if LONG_MAX < 1U<<53 && defined(FE_INEXACT) 28 #if LONG_MAX < 1U << 53 && defined(FE_INEXACT)
29 long lrint(double x) 29 long lrint(double x) {
30 { 30 #pragma STDC FENV_ACCESS ON
31 » #pragma STDC FENV_ACCESS ON 31 int e;
32 » int e;
33 32
34 » e = fetestexcept(FE_INEXACT); 33 e = fetestexcept(FE_INEXACT);
35 » x = rint(x); 34 x = rint(x);
36 » if (!e && (x > LONG_MAX || x < LONG_MIN)) 35 if (!e && (x > LONG_MAX || x < LONG_MIN))
37 » » feclearexcept(FE_INEXACT); 36 feclearexcept(FE_INEXACT);
38 » /* conversion */ 37 /* conversion */
39 » return x; 38 return x;
40 } 39 }
41 #else 40 #else
42 long lrint(double x) 41 long lrint(double x) {
43 { 42 return rint(x);
44 » return rint(x);
45 } 43 }
46 #endif 44 #endif
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