X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Ffma.c;h=5fb9540601c520dac6ce9a519e8c9abe91aed7d7;hb=6cf865dba69bab6346dc268d9173609af36b984e;hp=a9de2cb37e0f70d73312edeadec8fbd6a21c9992;hpb=b1cbd70743f0e0e0295e92c3e38d7599114db8c6;p=musl

diff --git a/src/math/fma.c b/src/math/fma.c
index a9de2cb3..5fb95406 100644
--- a/src/math/fma.c
+++ b/src/math/fma.c
@@ -23,10 +23,6 @@ static void add(long double *hi, long double *lo, long double x, long double y)
 	*lo = y - r;
 }
 
-/*
-TODO(nsz): probably simpler mul is enough if we assume x and y are doubles
-so last 11bits are all zeros, no subnormals etc
-*/
 /* exact mul, assumes no over/underflow */
 static void mul(long double *hi, long double *lo, long double x, long double y)
 {
@@ -115,7 +111,7 @@ double fma(double x, double y, double z)
 		add(&hi, &lo2, xy, z);
 		if (hi == 0) {
 			fesetround(round);
-			/* TODO: verify that the sign of 0 is always correct */
+			/* make sure that the sign of 0 is correct */
 			return (xy + z) + lo1;
 		}
 	} else {
@@ -251,7 +247,7 @@ static inline double add_and_denormalize(double a, double b, int scale)
 			INSERT_WORD64(sum.hi, hibits);
 		}
 	}
-	return (ldexp(sum.hi, scale));
+	return scalbn(sum.hi, scale);
 }
 
 /*
@@ -368,7 +364,7 @@ double fma(double x, double y, double z)
 		}
 	}
 	if (spread <= DBL_MANT_DIG * 2)
-		zs = ldexp(zs, -spread);
+		zs = scalbn(zs, -spread);
 	else
 		zs = copysign(DBL_MIN, zs);
 
@@ -394,7 +390,7 @@ double fma(double x, double y, double z)
 		 */
 		fesetround(oround);
 		volatile double vzs = zs; /* XXX gcc CSE bug workaround */
-		return (xy.hi + vzs + ldexp(xy.lo, spread));
+		return xy.hi + vzs + scalbn(xy.lo, spread);
 	}
 
 	if (oround != FE_TONEAREST) {
@@ -404,13 +400,13 @@ double fma(double x, double y, double z)
 		 */
 		fesetround(oround);
 		adj = r.lo + xy.lo;
-		return (ldexp(r.hi + adj, spread));
+		return scalbn(r.hi + adj, spread);
 	}
 
 	adj = add_adjusted(r.lo, xy.lo);
 	if (spread + ilogb(r.hi) > -1023)
-		return (ldexp(r.hi + adj, spread));
+		return scalbn(r.hi + adj, spread);
 	else
-		return (add_and_denormalize(r.hi, adj, spread));
+		return add_and_denormalize(r.hi, adj, spread);
 }
 #endif