Fix a critical bug in 64-bit atomic operation lowering for 32-bit. The results of the cmpxchg8b instructions are being thrown away when it branches back to the top of the checking loop. This means the loop always compares against the old value and this can result in a dead lock.

llvm-svn: 93028

llvm-svn: 93026

llvm-svn: 93024

simplify it now that it is only used for truncates.

llvm-svn: 93021

llvm-svn: 93020

the input is already sign extended.

llvm-svn: 93019

result int by 8 for the first byte.  While normally harmless,
if the result is smaller than a byte, this shift is invalid.

llvm-svn: 93018

remove some trailing whitespace while there.

llvm-svn: 93008

llvm-svn: 93007

T2I_bin_ii12rs definition.

llvm-svn: 93006

putting relocations into the constant pool - this isn't needed
for correctness and in the rare occasion it happens would pull
us out of fast isel for the block.

If fast-isel application startup time ever becomes an issue we
can add better support for these addresses instead of bailing.

llvm-svn: 92995

ReplaceAllUsesOfValueWith may delete other nodes that the one being replaced. Do not delete dead nodes again.

llvm-svn: 92988

1. CMPXCHG8B and CMPXCHG16B did not specify implicit physical register defs and uses.
2. LCMPXCHG8B is loading 64 bit memory, not 32 bit.

llvm-svn: 92985

llvm-svn: 92972

llvm-svn: 92964

that feeds into a zext, similar to the patch I did yesterday for sext.
There is a lot of room for extension beyond this patch.

llvm-svn: 92962

When folding a and(any_ext(load)) both the any_ext and the
load have to have only a single use.

This removes the anyext-uses.ll testcase which started failing
because it is unreduced and unclear what it is testing.

llvm-svn: 92950

time, no functionality change.

llvm-svn: 92948

llvm-svn: 92943

llvm-svn: 92938

add it to the constant pool for fast-isel. We already
don't add it for the normal case.

llvm-svn: 92934

not-readonly segment on darwin.

llvm-svn: 92933

llvm-svn: 92931

llvm-svn: 92921

llvm-svn: 92920

llvm-svn: 92919

llvm-svn: 92918

llvm-svn: 92912

are prepared to look through.

llvm-svn: 92898

llvm-svn: 92896

llvm-svn: 92892

to an element of a vector in a static ctor) which occurs with an 
unrelated patch I'm testing.  Annoyingly, EvaluateStoreInto basically 
does exactly the same stuff as InsertElement constant folding, but it
now handles vectors, and you can't insertelement into a vector.  It
would be 'really nice' if GEP into a vector were not legal.

llvm-svn: 92889

Fix a minor regression from my dag combiner changes. One more place which needs to look pass truncates.

llvm-svn: 92885

std::vector and llvm::SmallVector have annoying performance
tradeoffs. No, I don't expect this to matter, and now it won't.

llvm-svn: 92884

llvm-svn: 92876

llvm-svn: 92874

Some instructions refer to unique labels, and so cannot be trivially cloned
with CloneMachineInstr.

llvm-svn: 92873

for stack references.

llvm-svn: 92871

multiple register definitions.

llvm-svn: 92864

it work for any integer size return type.

llvm-svn: 92853