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Fix bug #552: disable EIGEN_GLIBC_MALLOC_ALREADY_ALIGNED when compiling with -fsanitize=address, and allow users to manually tell whether EIGEN_MALLOC_ALREADY_ALIGNED.

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This commit is contained in:
Gael Guennebaud 2013-02-25 19:17:13 +01:00
parent 12a1313b09
commit b6dc2613ac
2 changed files with 11 additions and 2 deletions
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8
Eigen/src/Core/util/Memory.h
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@ -19,6 +19,10 @@
#ifndef EIGEN_MEMORY_H
#define EIGEN_MEMORY_H
#ifndef EIGEN_MALLOC_ALREADY_ALIGNED
// Try to determine automatically if malloc is already aligned.
// On 64-bit systems, glibc's malloc returns 16-byte-aligned pointers, see:
// http://www.gnu.org/s/libc/manual/html_node/Aligned-Memory-Blocks.html
// This is true at least since glibc 2.8.
@ -27,7 +31,7 @@
// page 114, "[The] LP64 model [...] is used by all 64-bit UNIX ports" so it's indeed
// quite safe, at least within the context of glibc, to equate 64-bit with LP64.
#if defined(__GLIBC__) && ((__GLIBC__>=2 && __GLIBC_MINOR__ >= 8) || __GLIBC__>2) \
&& defined(__LP64__)
&& defined(__LP64__) && ! defined( __SANITIZE_ADDRESS__ )
#define EIGEN_GLIBC_MALLOC_ALREADY_ALIGNED 1
#else
#define EIGEN_GLIBC_MALLOC_ALREADY_ALIGNED 0
@ -52,6 +56,8 @@
#define EIGEN_MALLOC_ALREADY_ALIGNED 0
#endif
#endif
#if ((defined __QNXNTO__) || (defined _GNU_SOURCE) || ((defined _XOPEN_SOURCE) && (_XOPEN_SOURCE >= 600))) \
&& (defined _POSIX_ADVISORY_INFO) && (_POSIX_ADVISORY_INFO > 0)
#define EIGEN_HAS_POSIX_MEMALIGN 1

5
doc/PreprocessorDirectives.dox
View File

@ -30,7 +30,7 @@ are doing.
initialized to zero, as are new entries in matrices and arrays after resizing. Not defined by default.
- \b EIGEN_INITIALIZE_MATRICES_BY_NAN - if defined, all entries of newly constructed matrices and arrays are
initialized to NaN, as are new entries in matrices and arrays after resizing. This option is especially
useful for debugging purpose, though a memory tool like <a href="http://valgrind.org/">valgring</a> is
useful for debugging purpose, though a memory tool like <a href="http://valgrind.org/">valgrind</a> is
preferable. Not defined by default.
- \b EIGEN_NO_AUTOMATIC_RESIZING - if defined, the matrices (or arrays) on both sides of an assignment
<tt>a = b</tt> have to be of the same size; otherwise, %Eigen automatically resizes \c a so that it is of
@ -55,6 +55,9 @@ run time. However, these assertions do cost time and can thus be turned off.
\section TopicPreprocessorDirectivesPerformance Alignment, vectorization and performance tweaking
- \b EIGEN_MALLOC_ALREADY_ALIGNED - Can be set to 0 or 1 to tell whether default system malloc already
returns aligned buffers. In not defined, then this information is automatically deduced from the compiler
and system preprocessor tokens.
- \b EIGEN_DONT_ALIGN - disables alignment completely. %Eigen will not try to align its objects and does not
expect that any objects passed to it are aligned. This will turn off vectorization. Not defined by default.
- \b EIGEN_DONT_ALIGN_STATICALLY - disables alignment of arrays on the stack. Not defined by default, unless