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-rw-r--r--src/math/acoshf.c11
-rw-r--r--src/math/acoshl.c4
2 files changed, 8 insertions, 7 deletions
diff --git a/src/math/acoshf.c b/src/math/acoshf.c
index 4596085e..16550f19 100644
--- a/src/math/acoshf.c
+++ b/src/math/acoshf.c
@@ -3,14 +3,15 @@
 /* acosh(x) = log(x + sqrt(x*x-1)) */
 float acoshf(float x)
 {
-	union {float f; int32_t i;} u = {.f = x};
+	union {float f; uint32_t i;} u = {x};
+	uint32_t a = u.i & 0x7fffffff;
 
-	if (u.i < 0x3f800000+(1<<23))
-		/* x < 2, invalid if x < 1 or nan */
+	if (a < 0x3f800000+(1<<23))
+		/* |x| < 2, invalid if x < 1 or nan */
 		/* up to 2ulp error in [1,1.125] */
 		return log1pf(x-1 + sqrtf((x-1)*(x-1)+2*(x-1)));
-	if (u.i < 0x3f800000+(12<<23))
-		/* x < 0x1p12 */
+	if (a < 0x3f800000+(12<<23))
+		/* |x| < 0x1p12 */
 		return logf(2*x - 1/(x+sqrtf(x*x-1)));
 	/* x >= 0x1p12 */
 	return logf(x) + 0.693147180559945309417232121458176568f;
diff --git a/src/math/acoshl.c b/src/math/acoshl.c
index de31fb75..4aa84acb 100644
--- a/src/math/acoshl.c
+++ b/src/math/acoshl.c
@@ -13,10 +13,10 @@ long double acoshl(long double x)
 	int e = u.i.se & 0x7fff;
 
 	if (e < 0x3fff + 1)
-		/* x < 2, invalid if x < 1 or nan */
+		/* |x| < 2, invalid if x < 1 or nan */
 		return log1pl(x-1 + sqrtl((x-1)*(x-1)+2*(x-1)));
 	if (e < 0x3fff + 32)
-		/* x < 0x1p32 */
+		/* |x| < 0x1p32 */
 		return logl(2*x - 1/(x+sqrtl(x*x-1)));
 	return logl(x) + 0.693147180559945309417232121458176568L;
 }