Fixed #27. Temporarily walk around axpy's low performance issue with …

…small imput size & multithreads.
OpenMathLib · Jun 19, 2011 · aeed8d6 · aeed8d6
1 parent b3d1887
commit aeed8d6
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diff --git a/Changelog.txt b/Changelog.txt
@@ -25,6 +25,7 @@ x86/x86_64:
 	* Fixed #28 a wrong result of dsdot on x86_64.
 	* Fixed #32 a SEGFAULT bug of zdotc with gcc-4.6.
 	* Fixed #33 ztrmm bug on Nehalem.
+	* Walk round #27 the low performance axpy issue with small imput size & multithreads.
 
 MIPS64:
 	* Fixed #28 a wrong result of dsdot on Loongson3A/MIPS64. 

diff --git a/interface/axpy.c b/interface/axpy.c
@@ -85,7 +85,11 @@ void CNAME(blasint n, FLOAT alpha, FLOAT *x, blasint incx, FLOAT *y, blasint inc
   //In that case, the threads would be dependent.
   if (incx == 0 || incy == 0)
 	  nthreads = 1;
-
+
+  //Temporarily walk around the low performance issue with small imput size & multithreads.
+  if (n <= 10000)
+	  nthreads = 1;
+
   if (nthreads == 1) {
 #endif