bug #1615: slightly increase the default unrolling limit to compensate for changeset 101ea26f5e18919972b321b5f7e3ef4e07be3fd6
.
This solves a performance regression with clang and 3x3 matrix products.
diff --git a/Eigen/src/Core/arch/Default/Settings.h b/Eigen/src/Core/arch/Default/Settings.h
index 097373c..a5c3ada 100644
--- a/Eigen/src/Core/arch/Default/Settings.h
+++ b/Eigen/src/Core/arch/Default/Settings.h
@@ -21,7 +21,7 @@
* it does not correspond to the number of iterations or the number of instructions
*/
#ifndef EIGEN_UNROLLING_LIMIT
-#define EIGEN_UNROLLING_LIMIT 100
+#define EIGEN_UNROLLING_LIMIT 110
#endif
/** Defines the threshold between a "small" and a "large" matrix.
diff --git a/doc/PreprocessorDirectives.dox b/doc/PreprocessorDirectives.dox
index 7e9e30c..ffd2c66 100644
--- a/doc/PreprocessorDirectives.dox
+++ b/doc/PreprocessorDirectives.dox
@@ -117,7 +117,7 @@
Define it to 0 to disable.
- \b \c EIGEN_UNROLLING_LIMIT - defines the size of a loop to enable meta unrolling. Set it to zero to disable
unrolling. The size of a loop here is expressed in %Eigen's own notion of "number of FLOPS", it does not
- correspond to the number of iterations or the number of instructions. The default is value 100.
+ correspond to the number of iterations or the number of instructions. The default is value 110.
- \b \c EIGEN_STACK_ALLOCATION_LIMIT - defines the maximum bytes for a buffer to be allocated on the stack. For internal
temporary buffers, dynamic memory allocation is employed as a fall back. For fixed-size matrices or arrays, exceeding
this threshold raises a compile time assertion. Use 0 to set no limit. Default is 128 KB.
