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llvm-mirror/lib/Transforms
Duncan Sands 5a6c6a92c1 Change packed struct layout so that field sizes
are the same as in unpacked structs, only field
positions differ.  This only matters for structs
containing x86 long double or an apint; it may
cause backwards compatibility problems if someone
has bitcode containing a packed struct with a
field of one of those types.
The issue is that only 10 bytes are needed to
hold an x86 long double: the store size is 10
bytes, but the ABI size is 12 or 16 bytes (linux/
darwin) which comes from rounding the store size
up by the alignment.  Because it seemed silly not
to pack an x86 long double into 10 bytes in a
packed struct, this is what was done.  I now
think this was a mistake.  Reserving the ABI size
for an x86 long double field even in a packed
struct makes things more uniform: the ABI size is
now always used when reserving space for a type.
This means that developers are less likely to
make mistakes.  It also makes life easier for the
CBE which otherwise could not represent all LLVM
packed structs (PR2402).
Front-end people might need to adjust the way
they create LLVM structs - see following change
to llvm-gcc.

llvm-svn: 51928
2008-06-04 08:21:45 +00:00
..
Hello Clean up the use of static and anonymous namespaces. This turned up 2008-05-13 00:00:25 +00:00
Instrumentation Tidy up BasicBlock::getFirstNonPHI, and change a bunch of places to 2008-05-23 21:05:58 +00:00
IPO Use eraseFromParent() instead of doing that manually in two places. 2008-05-30 12:35:46 +00:00
Scalar Change packed struct layout so that field sizes 2008-06-04 08:21:45 +00:00
Utils LoopIndexSplit can sometimes result in cases where a block in its own domfrontier. 2008-06-03 18:29:48 +00:00
Makefile remove attribution from lib Makefiles. 2007-12-29 20:09:26 +00:00