Replace more instances of Eigen GEMV with Ceres BLAS.
With this ITERATIVE_SCHUR with JACOBI preconditioner went down from
280 seconds to 150 seconds on problem-744-543562-pre.txt.
Change-Id: I4f319c1108421e8d59f58654a4c0576ad65df609
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1f234c7..eee67fa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -654,9 +654,13 @@
"${CMAKE_CXX_FLAGS} -Werror -Wall -Wextra -Wno-unknown-pragmas -Wno-sign-compare -Wno-unused-parameter")
ENDIF ("${UNIX}")
-# We can be even stricter when using CLang
+# Use a larger inlining threshold for Clang, since it hobbles Eigen,
+# resulting in an unreasonably slow version of the blas routines. The
+# -Qunused-arguments is needed because CMake passes the inline
+# threshold to the linker and clang complains about it and dies.
IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
- SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-return-type-c-linkage")
+ SET(CMAKE_CXX_FLAGS
+ "${CMAKE_CXX_FLAGS} -Qunused-arguments -mllvm -inline-threshold=600 -Wno-return-type-c-linkage")
ENDIF()
ADD_SUBDIRECTORY(internal/ceres)
