math: use the rounding idiom consistently

[musl] / src / math / ceil.c

diff --git a/src/math/ceil.c b/src/math/ceil.c
index 22dc224..b13e6f2 100644 (file)
--- a/src/math/ceil.c
+++ b/src/math/ceil.c
@@ -1,5 +1,12 @@
 #include "libm.h"
 
+#if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
+#define EPS DBL_EPSILON
+#elif FLT_EVAL_METHOD==2
+#define EPS LDBL_EPSILON
+#endif
+static const double_t toint = 1/EPS;
+
 double ceil(double x)
 {
        union {double f; uint64_t i;} u = {x};
@@ -10,9 +17,9 @@ double ceil(double x)
                return x;
        /* y = int(x) - x, where int(x) is an integer neighbor of x */
        if (u.i >> 63)
-               y = (double)(x - 0x1p52) + 0x1p52 - x;
+               y = x - toint + toint - x;
        else
-               y = (double)(x + 0x1p52) - 0x1p52 - x;
+               y = x + toint - toint - x;
        /* special case because of non-nearest rounding modes */
        if (e <= 0x3ff-1) {
                FORCE_EVAL(y);