Free and vaarg are not really volatile.

llvm-svn: 51407

Fix PR2346 by marking vaarg as volatile so that licm doesn't try to
hoist them.

llvm-svn: 51356

Clean up the use of static and anonymous namespaces. This turned up
several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017

Fix the way AliasSet::print prints "may alias".

llvm-svn: 50051

Teach AliasSetTracker about VAArgInst.

llvm-svn: 49674

Restore isCFGOnly property of various analysis passes.

llvm-svn: 48579

PassInfo keep tracks whether a pass is an analysis pass or not.

llvm-svn: 48554

Do not use virtual function to identify an analysis pass.

llvm-svn: 48520

Identify Analysis pass.
Do not run analysis pass again if analysis info is still available.
This fixes PR1441.

llvm-svn: 48476

Remove attribution from file headers, per discussion on llvmdev.

llvm-svn: 45418

Integrate the readonly/readnone logic more deeply
into alias analysis. This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
wh

Integrate the readonly/readnone logic more deeply
into alias analysis. This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter. These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function. Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite. To reduce the
chance of misuse it is now protected.

llvm-svn: 44487

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Executive summary: getTypeSize -> getTypeStoreSize / getABITypeSize.
The meaning of getTypeSize was not clear - clarifying it is important
now that we have x86 long double and arbitrary precision int

Executive summary: getTypeSize -> getTypeStoreSize / getABITypeSize.
The meaning of getTypeSize was not clear - clarifying it is important
now that we have x86 long double and arbitrary precision integers.
The issue with long double is that it requires 80 bits, and this is
not a multiple of its alignment. This gives a primitive type for
which getTypeSize differed from getABITypeSize. For arbitrary precision
integers it is even worse: there is the minimum number of bits needed to
hold the type (eg: 36 for an i36), the maximum number of bits that will
be overwriten when storing the type (40 bits for i36) and the ABI size
(i.e. the storage size rounded up to a multiple of the alignment; 64 bits
for i36).

This patch removes getTypeSize (not really - it is still there but
deprecated to allow for a gradual transition). Instead there is:

(1) getTypeSizeInBits - a number of bits that suffices to hold all
values of the type. For a primitive type, this is the minimum number
of bits. For an i36 this is 36 bits. For x86 long double it is 80.
This corresponds to gcc's TYPE_PRECISION.

(2) getTypeStoreSizeInBits - the maximum number of bits that is
written when storing the type (or read when reading it). For an
i36 this is 40 bits, for an x86 long double it is 80 bits. This
is the size alias analysis is interested in (getTypeStoreSize
returns the number of bytes). There doesn't seem to be anything
corresponding to this in gcc.

(3) getABITypeSizeInBits - this is getTypeStoreSizeInBits rounded
up to a multiple of the alignment. For an i36 this is 64, for an
x86 long double this is 96 or 128 depending on the OS. This is the
spacing between consecutive elements when you form an array out of
this type (getABITypeSize returns the number of bytes). This is
TYPE_SIZE in gcc.

Since successive elements in a SequentialType (arrays, pointers
and vectors) need to be aligned, the spacing between them will be
given by getABITypeSize. This means that the size of an array
is the length times the getABITypeSize. It also means that GEP
computations need to use getABITypeSize when computing offsets.
Furthermore, if an alloca allocates several elements at once then
these too need to be aligned, so the size of the alloca has to be
the number of elements multiplied by getABITypeSize. Logically
speaking this doesn't have to be the case when allocating just
one element, but it is simpler to also use getABITypeSize in this
case. So alloca's and mallocs should use getABITypeSize. Finally,
since gcc's only notion of size is that given by getABITypeSize, if
you want to output assembler etc the same as gcc then getABITypeSize
is the size you want.

Since a store will overwrite no more than getTypeStoreSize bytes,
and a read will read no more than that many bytes, this is the
notion of size appropriate for alias analysis calculations.

In this patch I have corrected all type size uses except some of
those in ScalarReplAggregates, lib/Codegen, lib/Target (the hard
cases). I will get around to auditing these too at some point,
but I could do with some help.

Finally, I made one change which I think wise but others might
consider pointless and suboptimal: in an unpacked struct the
amount of space allocated for a field is now given by the ABI
size rather than getTypeStoreSize. I did this because every
other place that reserves memory for a type (eg: alloca) now
uses getABITypeSize, and I didn't want to make an exception
for unpacked structs, i.e. I did it to make things more uniform.
This only effects structs containing long doubles and arbitrary
precision integers. If someone wants to pack these types more
tightly they can always use a packed struct.

llvm-svn: 43620

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Use empty() member functions when that's what's being tested for instead
of comparing begin() and end().

llvm-svn: 42585

when merging two alias sets together, be sure to propagate the volatility of
the inner set. This fixes PR1435 and Transforms/LICM/2007-05-22-VolatileSink.ll

llvm-svn: 37305

Fix typo in comment.

llvm-svn: 36873

Drop 'const'

llvm-svn: 36662

Use 'static const char' instead of 'static const int'.
Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652

Do not use typeinfo to identify pass in pass manager.

llvm-svn: 36632

Make classes in anonymous namespaces use VISIBILITY_HIDDEN to help reduce
LLVM's footprint and speed up linking.

llvm-svn: 33941

Changed llvm_ostream et all to OStream. llvm_cerr, llvm_cout, llvm_null, are
now cerr, cout, and NullStream resp.

llvm-svn: 32298

Removed some of the iostream #includes. Moved towards converting to using
llvm streams

llvm-svn: 31983

Explain change with a comment.

llvm-svn: 30443

Fix PR912. The input to erase() must not be a reference to the data
being erased.

llvm-svn: 30442

eliminate RegisterOpt. It does the same thing as RegisterPass.

llvm-svn: 29925

Handle alias sets that have been unified, and thus can have other references
to them. This fixes a regression in my previous checkin.

llvm-svn: 28951