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authorUlrich Drepper <drepper@redhat.com>2009-08-26 00:51:45 -0700
committerUlrich Drepper <drepper@redhat.com>2009-08-26 00:51:45 -0700
commit2df4be8c3545f6158e468660a73f794573fb6f07 (patch)
treeec06cffcb2f9117507ad309fe749b86704b06158 /sysdeps/ieee754
parent15e7f0a44d6f17eb445f7d5f02ace7ec66306d7a (diff)
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Add isinf optimized for 64-bit.
Diffstat (limited to 'sysdeps/ieee754')
-rw-r--r--sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c
new file mode 100644
index 0000000000..c48e979a84
--- /dev/null
+++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c
@@ -0,0 +1,30 @@
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
+ * Public domain.
+ */
+
+/*
+ * isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
+ * no branching!
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+int
+__isinf (double x)
+{
+	int64_t ix;
+	EXTRACT_WORDS64(ix,x);
+	int64_t t = ix & UINT64_C(0x7fffffffffffffff);
+	t ^= UINT64_C(0x7ff0000000000000);
+	t |= -t;
+	return ~(t >> 63) & (ix >> 62);
+}
+hidden_def (__isinf)
+weak_alias (__isinf, isinf)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__isinf, __isinfl)
+weak_alias (__isinf, isinfl)
+#endif