[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.1b1-28-g626fb65

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http://git.mpich.org/mpich.git/commitdiff/626fb653a73c12544b28beeb3636b0824c61d28f

commit 626fb653a73c12544b28beeb3636b0824c61d28f
Author: William Gropp <wgropp at illinois.edu>
Date:   Sun Aug 25 10:09:35 2013 -0500

    Add FIXME for reduction operation macro

diff --git a/src/include/oputil.h b/src/include/oputil.h
index b4dfba1..0a6f23f 100644
--- a/src/include/oputil.h
+++ b/src/include/oputil.h
@@ -38,6 +38,10 @@ MPIR_OP_TYPE_GROUP(FORTRAN_INTEGER)
 
 /* op_macro_ is a 2-arg macro or function that preforms the reduction
    operation on a single element */
+/* FIXME: This code may penalize the performance on many platforms as
+   a work-around for a compiler bug in some versions of xlc.  It
+   would be far better to either test for that bug or to confirm that
+   the work-around is really as benign as claimed. */
 /* Ideally "b" would be const, but xlc on POWER7 can't currently handle
  * "const long double _Complex * restrict" as a valid pointer type.  It just
  * emits a warning and generates invalid arithmetic code.  We could drop the

-----------------------------------------------------------------------

Summary of changes:
 src/include/oputil.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


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