guix/gnu/packages/patches/eigen-remove-openmp-error-counting.patch

From ef3cc72cb65e2d500459c178c63e349bacfa834f Mon Sep 17 00:00:00 2001
From: Luke Peterson <hazelnusse@gmail.com>
Date: Thu, 8 Oct 2020 12:16:53 -0700
Subject: [PATCH] Remove error counting in OpenMP parallelize_gemm

This resolves a compilation error associated with
Eigen::eigen_assert_exception. It also eliminates the counting of
exceptions that may occur in the OpenMP parallel section. If an
unhandled exception occurs in this section, the behavior is non-conforming
according to the OpenMP specification.
---
 Eigen/src/Core/products/Parallelizer.h | 14 +++++---------
 test/CMakeLists.txt                    |  2 +-
 2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/Eigen/src/Core/products/Parallelizer.h b/Eigen/src/Core/products/Parallelizer.h
index 67b2442b5..a3cc05b77 100644
--- a/Eigen/src/Core/products/Parallelizer.h
+++ b/Eigen/src/Core/products/Parallelizer.h
@@ -132,8 +132,7 @@ void parallelize_gemm(const Functor& func, Index rows, Index cols, Index depth,
 
   ei_declare_aligned_stack_constructed_variable(GemmParallelInfo<Index>,info,threads,0);
 
-  int errorCount = 0;
-  #pragma omp parallel num_threads(threads) reduction(+: errorCount)
+  #pragma omp parallel num_threads(threads)
   {
     Index i = omp_get_thread_num();
     // Note that the actual number of threads might be lower than the number of request ones.
@@ -152,14 +151,11 @@ void parallelize_gemm(const Functor& func, Index rows, Index cols, Index depth,
     info[i].lhs_start = r0;
     info[i].lhs_length = actualBlockRows;
 
-    EIGEN_TRY {
-      if(transpose) func(c0, actualBlockCols, 0, rows, info);
-      else          func(0, rows, c0, actualBlockCols, info);
-    } EIGEN_CATCH(...) {
-      ++errorCount;
-    }
+    if(transpose)
+      func(c0, actualBlockCols, 0, rows, info);
+    else
+      func(0, rows, c0, actualBlockCols, info);
   }
-  if (errorCount) EIGEN_THROW_X(Eigen::eigen_assert_exception());
 #endif
 }
 
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0747aa6cb..b02577780 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -163,7 +163,7 @@ ei_add_test(constructor)
 ei_add_test(linearstructure)
 ei_add_test(integer_types)
 ei_add_test(unalignedcount)
-if(NOT EIGEN_TEST_NO_EXCEPTIONS)
+if(NOT EIGEN_TEST_NO_EXCEPTIONS AND NOT EIGEN_TEST_OPENMP)
   ei_add_test(exceptions)
 endif()
 ei_add_test(redux)
-- 
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