Take upstream libm changes.
Mostly workarounds for GCC and Clang bugs.
Change-Id: I4ef428a42d4ac6d622659053711a8cc416925727
diff --git a/libm/upstream-freebsd/lib/msun/src/e_log2.c b/libm/upstream-freebsd/lib/msun/src/e_log2.c
index 1fc44a5..4766cdb 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_log2.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_log2.c
@@ -24,6 +24,8 @@
* in not-quite-routine extra precision.
*/
+#include <float.h>
+
#include "math.h"
#include "math_private.h"
#include "k_log.h"
@@ -34,6 +36,7 @@
ivln2lo = 1.67517131648865118353e-10; /* 0x3de705fc, 0x2eefa200 */
static const double zero = 0.0;
+static volatile double vzero = 0.0;
double
__ieee754_log2(double x)
@@ -47,7 +50,7 @@
k=0;
if (hx < 0x00100000) { /* x < 2**-1022 */
if (((hx&0x7fffffff)|lx)==0)
- return -two54/zero; /* log(+-0)=-inf */
+ return -two54/vzero; /* log(+-0)=-inf */
if (hx<0) return (x-x)/zero; /* log(-#) = NaN */
k -= 54; x *= two54; /* subnormal number, scale up x */
GET_HIGH_WORD(hx,x);
@@ -108,3 +111,7 @@
return val_lo + val_hi;
}
+
+#if (LDBL_MANT_DIG == 53)
+__weak_reference(log2, log2l);
+#endif