1 files changed, 142 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/sfcmp.c b/arch/parisc/math-emu/sfcmp.c
new file mode 100644
index 000000000..4a708f6c6
--- /dev/null
+++ b/arch/parisc/math-emu/sfcmp.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Linux/PA-RISC Project (http://www.parisc-linux.org/)
+ *
+ * Floating-point emulation code
+ *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
+ */
+/*
+ * BEGIN_DESC
+ *
+ *  File:
+ *	@(#)	pa/spmath/sfcmp.c		$Revision: 1.1 $
+ *
+ *  Purpose:
+ *	sgl_cmp: compare two values
+ *
+ *  External Interfaces:
+ *	sgl_fcmp(leftptr, rightptr, cond, status)
+ *
+ *  Internal Interfaces:
+ *
+ *  Theory:
+ *	<<please update with a overview of the operation of this file>>
+ *
+ * END_DESC
+*/
+
+
+#include "float.h"
+#include "sgl_float.h"
+    
+/*
+ * sgl_cmp: compare two values
+ */
+int
+sgl_fcmp (sgl_floating_point * leftptr, sgl_floating_point * rightptr,
+	  unsigned int cond, unsigned int *status)
+                                           
+                       /* The predicate to be tested */
+                         
+    {
+    register unsigned int left, right;
+    register int xorresult;
+        
+    /* Create local copies of the numbers */
+    left = *leftptr;
+    right = *rightptr;
+
+    /*
+     * Test for NaN
+     */
+    if(    (Sgl_exponent(left) == SGL_INFINITY_EXPONENT)
+        || (Sgl_exponent(right) == SGL_INFINITY_EXPONENT) )
+	{
+	/* Check if a NaN is involved.  Signal an invalid exception when 
+	 * comparing a signaling NaN or when comparing quiet NaNs and the
+	 * low bit of the condition is set */
+        if( (  (Sgl_exponent(left) == SGL_INFINITY_EXPONENT)
+	    && Sgl_isnotzero_mantissa(left) 
+	    && (Exception(cond) || Sgl_isone_signaling(left)))
+	   ||
+	    (  (Sgl_exponent(right) == SGL_INFINITY_EXPONENT)
+	    && Sgl_isnotzero_mantissa(right) 
+	    && (Exception(cond) || Sgl_isone_signaling(right)) ) )
+	    {
+	    if( Is_invalidtrap_enabled() ) {
+	    	Set_status_cbit(Unordered(cond));
+		return(INVALIDEXCEPTION);
+	    }
+	    else Set_invalidflag();
+	    Set_status_cbit(Unordered(cond));
+	    return(NOEXCEPTION);
+	    }
+	/* All the exceptional conditions are handled, now special case
+	   NaN compares */
+        else if( ((Sgl_exponent(left) == SGL_INFINITY_EXPONENT)
+	    && Sgl_isnotzero_mantissa(left))
+	   ||
+	    ((Sgl_exponent(right) == SGL_INFINITY_EXPONENT)
+	    && Sgl_isnotzero_mantissa(right)) )
+	    {
+	    /* NaNs always compare unordered. */
+	    Set_status_cbit(Unordered(cond));
+	    return(NOEXCEPTION);
+	    }
+	/* infinities will drop down to the normal compare mechanisms */
+	}
+    /* First compare for unequal signs => less or greater or
+     * special equal case */
+    Sgl_xortointp1(left,right,xorresult);
+    if( xorresult < 0 )
+        {
+        /* left negative => less, left positive => greater.
+         * equal is possible if both operands are zeros. */
+        if( Sgl_iszero_exponentmantissa(left) 
+	  && Sgl_iszero_exponentmantissa(right) )
+            {
+	    Set_status_cbit(Equal(cond));
+	    }
+	else if( Sgl_isone_sign(left) )
+	    {
+	    Set_status_cbit(Lessthan(cond));
+	    }
+	else
+	    {
+	    Set_status_cbit(Greaterthan(cond));
+	    }
+        }
+    /* Signs are the same.  Treat negative numbers separately
+     * from the positives because of the reversed sense.  */
+    else if( Sgl_all(left) == Sgl_all(right) )
+        {
+        Set_status_cbit(Equal(cond));
+        }
+    else if( Sgl_iszero_sign(left) )
+        {
+        /* Positive compare */
+        if( Sgl_all(left) < Sgl_all(right) )
+	    {
+	    Set_status_cbit(Lessthan(cond));
+	    }
+	else
+	    {
+	    Set_status_cbit(Greaterthan(cond));
+	    }
+	}
+    else
+        {
+        /* Negative compare.  Signed or unsigned compares
+         * both work the same.  That distinction is only
+         * important when the sign bits differ. */
+        if( Sgl_all(left) > Sgl_all(right) )
+	    {
+	    Set_status_cbit(Lessthan(cond));
+	    }
+        else
+	    {
+	    Set_status_cbit(Greaterthan(cond));
+	    }
+        }
+	return(NOEXCEPTION);
+    }