From b3a6901e66f55b35aa9e01bcb24134e6a65ea004 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Fri, 26 Jun 2009 16:47:03 +0000
Subject: Initial import of compiler-rt.  -

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/ppc/divtc3.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 lib/ppc/divtc3.c

(limited to 'lib/ppc/divtc3.c')

diff --git a/lib/ppc/divtc3.c b/lib/ppc/divtc3.c
new file mode 100644
index 000000000..bec6b5353
--- /dev/null
+++ b/lib/ppc/divtc3.c
@@ -0,0 +1,88 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+#include "DD.h"
+#include <math.h>
+
+#define makeFinite(x)	{ \
+							(x).hi = __builtin_copysign(isinf((x).hi) ? 1.0 : 0.0, (x).hi); \
+							(x).lo = 0.0; \
+						}
+
+long double __gcc_qadd(long double, long double);
+long double __gcc_qsub(long double, long double);
+long double __gcc_qmul(long double, long double);
+long double __gcc_qdiv(long double, long double);
+
+long double _Complex
+__divtc3(long double a, long double b, long double c, long double d)
+{
+	DD cDD = { .ld = c };
+	DD dDD = { .ld = d };
+	
+	int ilogbw = 0;
+	const double logbw = logb(__builtin_fmax( __builtin_fabs(cDD.hi), __builtin_fabs(dDD.hi) ));
+	
+	if (isfinite(logbw))
+	{
+		ilogbw = (int)logbw;
+		
+		cDD.hi = scalbn(cDD.hi, -ilogbw);
+		cDD.lo = scalbn(cDD.lo, -ilogbw);
+		dDD.hi = scalbn(dDD.hi, -ilogbw);
+		dDD.lo = scalbn(dDD.lo, -ilogbw);
+	}
+	
+	const long double denom = __gcc_qadd(__gcc_qmul(cDD.ld, cDD.ld), __gcc_qmul(dDD.ld, dDD.ld));
+	const long double realNumerator = __gcc_qadd(__gcc_qmul(a,cDD.ld), __gcc_qmul(b,dDD.ld));
+	const long double imagNumerator = __gcc_qsub(__gcc_qmul(b,cDD.ld), __gcc_qmul(a,dDD.ld));
+	
+	DD real = { .ld = __gcc_qdiv(realNumerator, denom) };
+	DD imag = { .ld = __gcc_qdiv(imagNumerator, denom) };
+	
+	real.hi = scalbn(real.hi, -ilogbw);
+	real.lo = scalbn(real.lo, -ilogbw);
+	imag.hi = scalbn(imag.hi, -ilogbw);
+	imag.lo = scalbn(imag.lo, -ilogbw);
+	
+	if (isnan(real.hi) && isnan(imag.hi))
+	{
+		DD aDD = { .ld = a };
+		DD bDD = { .ld = b };
+		DD rDD = { .ld = denom };
+		
+		if ((rDD.hi == 0.0) && (!isnan(aDD.hi) || !isnan(bDD.hi)))
+		{
+			real.hi = __builtin_copysign(INFINITY,cDD.hi) * aDD.hi;
+			real.lo = 0.0;
+			imag.hi = __builtin_copysign(INFINITY,cDD.hi) * bDD.hi;
+			imag.lo = 0.0;
+		}
+		
+		else if ((isinf(aDD.hi) || isinf(bDD.hi)) && isfinite(cDD.hi) && isfinite(dDD.hi))
+		{
+			makeFinite(aDD);
+			makeFinite(bDD);
+			real.hi = INFINITY * (aDD.hi*cDD.hi + bDD.hi*dDD.hi);
+			real.lo = 0.0;
+			imag.hi = INFINITY * (bDD.hi*cDD.hi - aDD.hi*dDD.hi);
+			imag.lo = 0.0;
+		}
+		
+		else if ((isinf(cDD.hi) || isinf(dDD.hi)) && isfinite(aDD.hi) && isfinite(bDD.hi))
+		{
+			makeFinite(cDD);
+			makeFinite(dDD);
+			real.hi = __builtin_copysign(0.0,(aDD.hi*cDD.hi + bDD.hi*dDD.hi));
+			real.lo = 0.0;
+			imag.hi = __builtin_copysign(0.0,(bDD.hi*cDD.hi - aDD.hi*dDD.hi));
+			imag.lo = 0.0;
+		}
+	}
+	
+	long double _Complex z;
+	__real__ z = real.ld;
+	__imag__ z = imag.ld;
+	
+	return z;
+}
-- 
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