[PATCH] XCore target: add support to build MultiSource/Benchmarks/SciMark2-C

[robert lytton]

  The clock() function was wrapping, hence negative stopwatch elapse times were negating the Mflop calculations.
  As the Mflop calculations are disabled, clock() has been replaced by a simple counter.

Hi ddunbar,

http://llvm-reviews.chandlerc.com/D2771

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2771?vs=7069&id=7686#toc

Files:
  MultiSource/Benchmarks/SciMark2-C/Stopwatch.c

Index: MultiSource/Benchmarks/SciMark2-C/Stopwatch.c
===================================================================
--- MultiSource/Benchmarks/SciMark2-C/Stopwatch.c
+++ MultiSource/Benchmarks/SciMark2-C/Stopwatch.c
@@ -3,7 +3,12 @@
 
 double seconds()
 {
+#ifdef __XS1B__
+    static double t = 0.0;
+    return ++t;
+#else
         return ((double) clock()) / (double) CLOCKS_PER_SEC; 
+#endif
 }
 
 void Stopwtach_reset(Stopwatch Q)
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