http://llvm.org/bugs/show_bug.cgi?id=16294
Bug ID: 16294
Summary: implement __builtin_assume_aligned()
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Hello,
Thanks for your work on clang. It would be very useful to implement the
__builtin_assume_aligned() function, which allows the compiler to assume that
the returned pointer is aligned (to a user specified number of bytes). This can
help in automatic vectorisation, allowing the compiler to use aligned SSE2
instructions.
GCC 4.7+ has this:
http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
The __builtin_assume_aligned() function is used to speed up software such as
the Armadillo C++ linear algebra library:
http://arma.sourceforge.net/
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