diff --git a/lib/msun/src/e_expf.c b/lib/msun/src/e_expf.c
index b9eb0fcee54b..50b91dad4fa3 100644
--- a/lib/msun/src/e_expf.c
+++ b/lib/msun/src/e_expf.c
@@ -24,7 +24,6 @@ static const float
 one	= 1.0,
 halF[2]	= {0.5,-0.5,},
 huge	= 1.0e+30,
-twom100 = 7.8886090522e-31,      /* 2**-100=0x0d800000 */
 o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
 u_threshold= -1.0397208405e+02,  /* 0xc2cff1b5 */
 ln2HI[2]   ={ 6.9314575195e-01,		/* 0x3f317200 */
@@ -38,6 +37,8 @@ P3   =  6.6137559770e-05, /* 0x388ab355 */
 P4   = -1.6533901999e-06, /* 0xb5ddea0e */
 P5   =  4.1381369442e-08; /* 0x3331bb4c */
 
+static volatile float twom100 = 7.8886090522e-31;      /* 2**-100=0x0d800000 */
+
 float
 __ieee754_expf(float x)	/* default IEEE double exp */
 {
diff --git a/lib/msun/src/s_exp2.c b/lib/msun/src/s_exp2.c
index 6593a505eb6d..464e39c7b8d8 100644
--- a/lib/msun/src/s_exp2.c
+++ b/lib/msun/src/s_exp2.c
@@ -37,7 +37,6 @@ __FBSDID("$FreeBSD$");
 
 static const double
     huge     = 0x1p1000,
-    twom1000 = 0x1p-1000,
     redux    = 0x1.8p52 / TBLSIZE,
     P1	     = 0x1.62e42fefa39efp-1,
     P2	     = 0x1.ebfbdff82c575p-3,
@@ -45,6 +44,8 @@ static const double
     P4	     = 0x1.3b2ab88f70400p-7,
     P5	     = 0x1.5d88003875c74p-10;
 
+static volatile double twom1000 = 0x1p-1000;
+
 static const double tbl[TBLSIZE * 2] = {
 /*	exp2(z + eps)		eps	*/
 	0x1.6a09e667f3d5dp-1,	 0x1.9880p-44,
diff --git a/lib/msun/src/s_exp2f.c b/lib/msun/src/s_exp2f.c
index 1bc026a3f0eb..0a6142ffb431 100644
--- a/lib/msun/src/s_exp2f.c
+++ b/lib/msun/src/s_exp2f.c
@@ -35,13 +35,14 @@ __FBSDID("$FreeBSD$");
 
 static const float
     huge    = 0x1p100f,
-    twom100 = 0x1p-100f,
     redux   = 0x1.8p23f / TBLSIZE,
     P1	    = 0x1.62e430p-1f,
     P2	    = 0x1.ebfbe0p-3f,
     P3	    = 0x1.c6b348p-5f,
     P4	    = 0x1.3b2c9cp-7f;
 
+static volatile float twom100 = 0x1p-100f;
+
 static const double exp2ft[TBLSIZE] = {
 	0x1.6a09e667f3bcdp-1,
 	0x1.7a11473eb0187p-1,