diff --git a/lib/msun/src/e_pow.c b/lib/msun/src/e_pow.c
index 85afacdbb6a..85d1d551b6f 100644
--- a/lib/msun/src/e_pow.c
+++ b/lib/msun/src/e_pow.c
@@ -299,7 +299,11 @@ pow(double x, double y)
 	r  = (z*t1)/(t1-two)-(w+z*w);
 	z  = one-(r-z);
 	GET_HIGH_WORD(j,z);
-	j += (n<<20);
+    /*
+     * sign bit of z is 0.
+     * sign bit of j will indicate sign of 0x3ff-biased exponent.
+     */
+	j += (int32_t)((u_int32_t)n<<20);
 	if((j>>20)<=0) z = scalbn(z,n);	/* subnormal output */
 	else SET_HIGH_WORD(z,j);
 	return s*z;
diff --git a/lib/msun/src/e_powf.c b/lib/msun/src/e_powf.c
index 2e7c37542a7..9f670bcd1ca 100644
--- a/lib/msun/src/e_powf.c
+++ b/lib/msun/src/e_powf.c
@@ -242,7 +242,11 @@ powf(float x, float y)
 	r  = (z*t1)/(t1-two)-(w+z*w);
 	z  = one-(r-z);
 	GET_FLOAT_WORD(j,z);
-	j += (n<<23);
+    /*
+     * sign bit of z is 0.
+     * sign bit of j will indicate sign of 0x7f-biased exponent.
+     */
+	j += (int32_t)((u_int32_t)n<<23);
 	if((j>>23)<=0) z = scalbnf(z,n);	/* subnormal output */
 	else SET_FLOAT_WORD(z,j);
 	return sn*z;
diff --git a/lib/msun/src/e_rem_pio2.c b/lib/msun/src/e_rem_pio2.c
index 76ae8050d36..8a4006498a1 100644
--- a/lib/msun/src/e_rem_pio2.c
+++ b/lib/msun/src/e_rem_pio2.c
@@ -162,7 +162,7 @@ medium:
     /* set z = scalbn(|x|,ilogb(x)-23) */
 	GET_LOW_WORD(low,x);
 	e0 	= (ix>>20)-1046;	/* e0 = ilogb(z)-23; */
-	INSERT_WORDS(z, ix - ((int32_t)(e0<<20)), low);
+	INSERT_WORDS(z, ix - ((int32_t)((u_int32_t)e0<<20)), low);
 	for(i=0;i<2;i++) {
 		tx[i] = (double)((int32_t)(z));
 		z     = (z-tx[i])*two24;
diff --git a/lib/msun/src/e_rem_pio2f.c b/lib/msun/src/e_rem_pio2f.c
index 744060f1801..d9a3e2e34c4 100644
--- a/lib/msun/src/e_rem_pio2f.c
+++ b/lib/msun/src/e_rem_pio2f.c
@@ -67,7 +67,7 @@ __ieee754_rem_pio2f(float x, double *y)
 	}
     /* set z = scalbn(|x|,ilogb(|x|)-23) */
 	e0 = (ix>>23)-150;		/* e0 = ilogb(|x|)-23; */
-	SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23)));
+	SET_FLOAT_WORD(z, ix - ((int32_t)((u_int32_t)e0<<23)));
 	tx[0] = z;
 	n  =  __kernel_rem_pio2(tx,ty,e0,1,0);
 	if(hx<0) {*y = -ty[0]; return -n;}