Trick the compiler that volatile temporary is used while raising

the underflow.

3 files changed, 12 insertions, 0 deletions

diff --git a/lib/libm/src/ld80/s_nextafterl.c b/lib/libm/src/ld80/s_nextafterl.c
index d4d16a7d1c0..9187e44f7bf 100644
--- a/lib/libm/src/ld80/s_nextafterl.c
+++ b/lib/libm/src/ld80/s_nextafterl.c
@@ -79,6 +79,10 @@ nextafterl(long double x, long double y)
 	if(esy==0x7fff) return x+x;		/* overflow  */
 	if(esy==0) {
 	    volatile long double u = x*x;	/* underflow */
+	    if(u==x) {
+		SET_LDOUBLE_WORDS(x,esx,hx,lx);
+		return x;
+	    }
 	}
 	SET_LDOUBLE_WORDS(x,esx,hx,lx);
 	return x;
diff --git a/lib/libm/src/ld80/s_nexttoward.c b/lib/libm/src/ld80/s_nexttoward.c
index d85c97ef61a..a9d6773dcf7 100644
--- a/lib/libm/src/ld80/s_nexttoward.c
+++ b/lib/libm/src/ld80/s_nexttoward.c
@@ -76,6 +76,10 @@ nexttoward(double x, long double y)
 	}
 	if(hy<0x00100000) {
 	    volatile double u = x*x;		/* underflow */
+	    if(u==x) {
+		INSERT_WORDS(x,hx,lx);
+		return x;
+	    }
 	}
 	INSERT_WORDS(x,hx,lx);
 	return x;
diff --git a/lib/libm/src/s_nexttowardf.c b/lib/libm/src/s_nexttowardf.c
index ee22018343d..5e5749acd0d 100644
--- a/lib/libm/src/s_nexttowardf.c
+++ b/lib/libm/src/s_nexttowardf.c
@@ -68,6 +68,10 @@ nexttowardf(float x, long double y)
 	}
 	if(hy<0x00800000) {
 	    volatile float u = x*x;		/* underflow */
+	    if(u==x) {
+		SET_FLOAT_WORD(x,hx);
+		return x;
+	    }
 	}
 	SET_FLOAT_WORD(x,hx);
 	return x;