From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 sys/vops/abltk.gx | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 sys/vops/abltk.gx

(limited to 'sys/vops/abltk.gx')

diff --git a/sys/vops/abltk.gx b/sys/vops/abltk.gx
new file mode 100644
index 00000000..8d11cb09
--- /dev/null
+++ b/sys/vops/abltk.gx
@@ -0,0 +1,45 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ABLTK -- Vector boolean less than constant.  C[i], type INT, is set to 1 if
+# A[i] is less than B, else C[i] is set to zero.
+
+procedure abltk$t (a, b, c, npix)
+
+PIXEL	a[ARB]
+PIXEL	b
+int	c[ARB]
+int	npix
+int	i
+$if (datatype == x)
+real	abs_b
+$endif
+
+begin
+	# The case b==0 is perhaps worth optimizing.  On many machines this
+	# will save a memory fetch.
+
+	if (b == 0$f) {
+	    $if (datatype == x)
+	    call aclri (c, npix)
+	    $else
+	    do i = 1, npix
+		if (a[i] < 0)
+		    c[i] = 1
+		else
+		    c[i] = 0
+	    $endif
+	} else {
+	    $if (datatype == x)
+	    abs_b = abs (b)
+	    $endif
+	    do i = 1, npix
+		$if (datatype == x)
+		if (abs (a[i]) < abs_b)
+		$else
+		if (a[i] < b)
+		$endif
+		    c[i] = 1
+		else
+		    c[i] = 0
+	}
+end
-- 
cgit