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authornsz <nsz@port70.net>2012-03-19 23:30:45 +0100
committernsz <nsz@port70.net>2012-03-19 23:30:45 +0100
commit4caa17b2a17d136efedfb63fceef832401063d70 (patch)
tree960f507b4ab31bfb314fc0466bcf26f7a9ca31da
parent75483499dad38b97f5dabb710635e6a8bbbb1c84 (diff)
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don't try to create non-standard denormalization signal
Underflow exception is only raised when the result is
invalid, but fmod is always exact. x87 has a denormalization
exception, but that's nonstandard. And the superflous *1.0
will be optimized away by any compiler that does not honor
signaling nans.
-rw-r--r--src/math/fmod.c3
-rw-r--r--src/math/fmodf.c3
-rw-r--r--src/math/fmodl.c5
3 files changed, 4 insertions, 7 deletions
diff --git a/src/math/fmod.c b/src/math/fmod.c
index 6856844e..84a1b4ac 100644
--- a/src/math/fmod.c
+++ b/src/math/fmod.c
@@ -17,7 +17,7 @@
 
 #include "libm.h"
 
-static const double one = 1.0, Zero[] = {0.0, -0.0,};
+static const double Zero[] = {0.0, -0.0,};
 
 double fmod(double x, double y)
 {
@@ -140,7 +140,6 @@ double fmod(double x, double y)
 			lx = hx>>(n-32); hx = sx;
 		}
 		INSERT_WORDS(x, hx|sx, lx);
-		x *= one;  /* create necessary signal */
 	}
 	return x;  /* exact output */
 }
diff --git a/src/math/fmodf.c b/src/math/fmodf.c
index 4b50a3d3..837e9371 100644
--- a/src/math/fmodf.c
+++ b/src/math/fmodf.c
@@ -20,7 +20,7 @@
 
 #include "libm.h"
 
-static const float one = 1.0, Zero[] = {0.0, -0.0,};
+static const float Zero[] = {0.0, -0.0,};
 
 float fmodf(float x, float y)
 {
@@ -99,7 +99,6 @@ float fmodf(float x, float y)
 		n = -126 - iy;
 		hx >>= n;
 		SET_FLOAT_WORD(x, hx|sx);
-		x *= one;          /* create necessary signal */
 	}
 	return x;  /* exact output */
 }
diff --git a/src/math/fmodl.c b/src/math/fmodl.c
index 2e3eec1f..b930c49d 100644
--- a/src/math/fmodl.c
+++ b/src/math/fmodl.c
@@ -48,7 +48,7 @@ typedef uint32_t manh_t;
 
 #define MANL_SHIFT      (LDBL_MANL_SIZE - 1)
 
-static const long double one = 1.0, Zero[] = {0.0, -0.0,};
+static const long double Zero[] = {0.0, -0.0,};
 
 /*
  * fmodl(x,y)
@@ -153,7 +153,6 @@ long double fmodl(long double x, long double y)
 	} else {
 		ux.bits.exp = iy + BIAS;
 	}
-	x = ux.e * one;   /* create necessary signal */
-	return x;         /* exact output */
+	return ux.e;       /* exact output */
 }
 #endif