Import libcompiler_rt into HEAD and add Makefiles.

Obtained from:	user/ed/compiler-rt

1 files changed, 93 insertions, 0 deletions

diff --git a/contrib/compiler-rt/lib/ppc/divtc3.c b/contrib/compiler-rt/lib/ppc/divtc3.c
new file mode 100644
index 0000000..d41f621
--- /dev/null
+++ b/contrib/compiler-rt/lib/ppc/divtc3.c
@@ -0,0 +1,93 @@
+/* This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ */
+
+#include "DD.h"
+#include <math.h>
+
+#if !defined(INFINITY) && defined(HUGE_VAL)
+#define INFINITY HUGE_VAL
+#endif /* INFINITY */
+
+#define makeFinite(x)	{ \
+							(x).s.hi = __builtin_copysign(isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
+							(x).s.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.s.hi), __builtin_fabs(dDD.s.hi) ));
+	
+	if (isfinite(logbw))
+	{
+		ilogbw = (int)logbw;
+		
+		cDD.s.hi = scalbn(cDD.s.hi, -ilogbw);
+		cDD.s.lo = scalbn(cDD.s.lo, -ilogbw);
+		dDD.s.hi = scalbn(dDD.s.hi, -ilogbw);
+		dDD.s.lo = scalbn(dDD.s.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.s.hi = scalbn(real.s.hi, -ilogbw);
+	real.s.lo = scalbn(real.s.lo, -ilogbw);
+	imag.s.hi = scalbn(imag.s.hi, -ilogbw);
+	imag.s.lo = scalbn(imag.s.lo, -ilogbw);
+	
+	if (isnan(real.s.hi) && isnan(imag.s.hi))
+	{
+		DD aDD = { .ld = a };
+		DD bDD = { .ld = b };
+		DD rDD = { .ld = denom };
+		
+		if ((rDD.s.hi == 0.0) && (!isnan(aDD.s.hi) || !isnan(bDD.s.hi)))
+		{
+			real.s.hi = __builtin_copysign(INFINITY,cDD.s.hi) * aDD.s.hi;
+			real.s.lo = 0.0;
+			imag.s.hi = __builtin_copysign(INFINITY,cDD.s.hi) * bDD.s.hi;
+			imag.s.lo = 0.0;
+		}
+		
+		else if ((isinf(aDD.s.hi) || isinf(bDD.s.hi)) && isfinite(cDD.s.hi) && isfinite(dDD.s.hi))
+		{
+			makeFinite(aDD);
+			makeFinite(bDD);
+			real.s.hi = INFINITY * (aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi);
+			real.s.lo = 0.0;
+			imag.s.hi = INFINITY * (bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi);
+			imag.s.lo = 0.0;
+		}
+		
+		else if ((isinf(cDD.s.hi) || isinf(dDD.s.hi)) && isfinite(aDD.s.hi) && isfinite(bDD.s.hi))
+		{
+			makeFinite(cDD);
+			makeFinite(dDD);
+			real.s.hi = __builtin_copysign(0.0,(aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi));
+			real.s.lo = 0.0;
+			imag.s.hi = __builtin_copysign(0.0,(bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi));
+			imag.s.lo = 0.0;
+		}
+	}
+	
+	long double _Complex z;
+	__real__ z = real.ld;
+	__imag__ z = imag.ld;
+	
+	return z;
+}