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-rw-r--r--src/math/logb.c17
-rw-r--r--src/math/logbf.c14
-rw-r--r--src/math/logbl.c11
3 files changed, 17 insertions, 25 deletions
diff --git a/src/math/logb.c b/src/math/logb.c
index f7cd7613..624425a8 100644
--- a/src/math/logb.c
+++ b/src/math/logb.c
@@ -1,20 +1,17 @@
-#include <limits.h>
#include "libm.h"
/*
special cases:
- logb(+-0) = -inf
+ logb(+-0) = -inf, and raise divbyzero
logb(+-inf) = +inf
logb(nan) = nan
-these are calculated at runtime to raise fp exceptions
*/
-double logb(double x) {
- int i = ilogb(x);
-
- if (i == FP_ILOGB0)
- return -1.0/fabs(x);
- if (i == FP_ILOGBNAN || i == INT_MAX)
+double logb(double x)
+{
+ if (!isfinite(x))
return x * x;
- return i;
+ if (x == 0)
+ return -1/(x+0);
+ return ilogb(x);
}
diff --git a/src/math/logbf.c b/src/math/logbf.c
index 934827f8..950d3569 100644
--- a/src/math/logbf.c
+++ b/src/math/logbf.c
@@ -1,12 +1,10 @@
-#include <limits.h>
#include "libm.h"
-float logbf(float x) {
- int i = ilogbf(x);
-
- if (i == FP_ILOGB0)
- return -1.0f/fabsf(x);
- if (i == FP_ILOGBNAN || i == INT_MAX)
+float logbf(float x)
+{
+ if (!isfinite(x))
return x * x;
- return i;
+ if (x == 0)
+ return -1/(x+0);
+ return ilogbf(x);
}
diff --git a/src/math/logbl.c b/src/math/logbl.c
index 5d04abd7..f3850745 100644
--- a/src/math/logbl.c
+++ b/src/math/logbl.c
@@ -1,4 +1,3 @@
-#include <limits.h>
#include "libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double logbl(long double x)
@@ -8,12 +7,10 @@ long double logbl(long double x)
#else
long double logbl(long double x)
{
- int i = ilogbl(x);
-
- if (i == FP_ILOGB0)
- return -1.0/fabsl(x);
- if (i == FP_ILOGBNAN || i == INT_MAX)
+ if (!isfinite(x))
return x * x;
- return i;
+ if (x == 0)
+ return -1/(x+0);
+ return ilogbl(x);
}
#endif