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Commit Graph

16 Commits

Author SHA1 Message Date
Stephen Lin
3ae734a60c Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion.
This was done with the following sed invocation to catch label lines demarking function boundaries:
    sed -i '' "s/^;\( *\)\([A-Z0-9_]*\):\( *\)test\([A-Za-z0-9_-]*\):\( *\)$/;\1\2-LABEL:\3test\4:\5/g" test/CodeGen/*/*.ll
which was written conservatively to avoid false positives rather than false negatives. I scanned through all the changes and everything looks correct.

llvm-svn: 186258
2013-07-13 20:38:47 +00:00
Chandler Carruth
aea541125e Fix the root cause of PR15348 by correctly handling alignment 0 on
memory intrinsics in the SDAG builder.

When alignment is zero, the lang ref says that *no* alignment
assumptions can be made. This is the exact opposite of the internal API
contracts of the DAG where alignment 0 indicates that the alignment can
be made to be anything desired.

There is another, more explicit alignment that is better suited for the
role of "no alignment at all": an alignment of 1. Map the intrinsic
alignment to this early so that we don't end up generating aligned DAGs.

It is really terrifying that we've never seen this before, but we
suddenly started generating a large number of alignment 0 memcpys due to
the new code to do memcpy-based copying of POD class members. That patch
contains a bug that rounds bitfield alignments down when they are the
first field. This can in turn produce zero alignments.

This fixes weird crashes I've seen in library users of LLVM on 32-bit
hosts, etc.

llvm-svn: 176022
2013-02-25 14:20:21 +00:00
Evan Cheng
6ac3dd6e89 PR14896: Handle memcpy from constant string where the memcpy size is larger than the string size.
llvm-svn: 172124
2013-01-10 22:13:27 +00:00
Benjamin Kramer
b42939c43b Fix broken check lines.
I really need to find a way to automate this, but I can't come up with a regex
that has no false positives while handling tricky cases like custom check
prefixes.

llvm-svn: 162097
2012-08-17 12:28:26 +00:00
Chris Lattner
4881c9ecb0 Add a test for the miscompilation my recent ConstantDataArray patches introduced, to make sure
we don't regress on it in the future.

llvm-svn: 149803
2012-02-05 02:37:36 +00:00
Evan Cheng
bbed81df25 Add Mode64Bit feature and sink it down to MC layer.
llvm-svn: 134641
2011-07-07 21:06:52 +00:00
Evan Cheng
ae26b91353 Revert r122955. It seems using movups to lower memcpy can cause massive regression (even on Nehalem) in edge cases. I also didn't see any real performance benefit.
llvm-svn: 123015
2011-01-07 19:35:30 +00:00
Evan Cheng
1a1771584e Use movups to lower memcpy and memset even if it's not fast (like corei7).
The theory is it's still faster than a pair of movq / a quad of movl. This
will probably hurt older chips like P4 but should run faster on current
and future Intel processors. rdar://8817010

llvm-svn: 122955
2011-01-06 07:58:36 +00:00
Evan Cheng
cb39cc2164 Re-implement r122936 with proper target hooks. Now getMaxStoresPerMemcpy
etc. takes an option OptSize. If OptSize is true, it would return
the inline limit for functions with attribute OptSize.

llvm-svn: 122952
2011-01-06 06:52:41 +00:00
Evan Cheng
70711ea54d Revert r122936. I'll re-implement the change.
llvm-svn: 122949
2011-01-06 06:17:53 +00:00
Evan Cheng
d425aa5d2a r105228 reduced the memcpy / memset inline limit to 4 with -Os to avoid blowing
up freebsd bootloader. However, this doesn't make much sense for Darwin, whose
-Os is meant to optimize for size only if it doesn't hurt performance.
rdar://8821501

llvm-svn: 122936
2011-01-06 01:04:47 +00:00
Chris Lattner
14bf35ae45 fix PR6623: when optimizing for size, don't inline memcpy/memsets
that are too large.  This causes the freebsd bootloader to be too
large apparently.

It's unclear if this should be an -Os or -Oz thing.  Thoughts welcome.

llvm-svn: 105228
2010-05-31 17:30:14 +00:00
Chris Lattner
e8b65c0352 upgrade and filecheckize this test.
llvm-svn: 105227
2010-05-31 17:27:17 +00:00
Evan Cheng
7d177beb1d Add nounwind.
llvm-svn: 100482
2010-04-05 22:30:05 +00:00
Dan Gohman
df2896d609 Eliminate more uses of llvm-as and llvm-dis.
llvm-svn: 81290
2009-09-08 23:54:48 +00:00
Rafael Espindola
01b306e575 Refactor the memcpy lowering for the x86 target.
The only generated code difference is that now we call memcpy when
the size of the array is unknown. This matches GCC behavior and is
better since the run time value can be arbitrarily large.

llvm-svn: 42433
2007-09-28 12:53:01 +00:00