7c5dc122a0
Change a bunch of isVolatile() checks to check for atomic load/store as well.
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No tests; these changes aren't really interesting in the sense that the logic is the same for volatile and atomic.
I believe this completes all of the changes necessary for the optimizer to handle loads and stores correctly. I'm going to try and come up with some additional testing, though.
llvm-svn: 139533
2011-09-12 20:23:13 +00:00
bde6ec1db6
Duncan deftly points out that readnone functions aren't
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invalidated by stores, so they can be handled as 'simple'
operations.
llvm-svn: 122785
2011-01-03 23:38:13 +00:00
16ca19ffc5
stength reduce my previous patch a bit. The only instructions
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that are allowed to have metadata operands are intrinsic calls,
and the only ones that take metadata currently return void.
Just reject all void instructions, which should not be value
numbered anyway. To future proof things, add an assert to the
getHashValue impl for calls to check that metadata operands
aren't present.
llvm-svn: 122759
2011-01-03 18:43:03 +00:00
142f1cd251
fix PR8895: metadata operands don't have a strong use of their
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nested values, so they can change and drop to null, which can
change the hash and cause havok.
It turns out that it isn't a good idea to value number stuff
with metadata operands anyway, so... don't.
llvm-svn: 122758
2011-01-03 18:28:15 +00:00
9e5e9ed79a
earlycse can do trivial with-a-block dead store
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elimination as well. This deletes 60 stores in 176.gcc
that largely come from bitfield code.
llvm-svn: 122736
2011-01-03 04:17:24 +00:00
4b9a525742
switch the load table to use a recycling bump pointer allocator,
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speeding earlycse up by 6%.
llvm-svn: 122733
2011-01-03 03:53:50 +00:00
e0e32a9ef0
now that loads are in their own table, we can implement
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store->load forwarding. This allows EarlyCSE to zap 600 more
loads from 176.gcc.
llvm-svn: 122732
2011-01-03 03:46:34 +00:00
92bb0f9f9d
split loads and calls into separate tables. Loads are now just indexed
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by their pointer instead of using MemoryValue to wrap it.
llvm-svn: 122731
2011-01-03 03:41:27 +00:00
4cb365414f
various cleanups, no functionality change.
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llvm-svn: 122729
2011-01-03 03:28:23 +00:00
b9a8efc960
Teach EarlyCSE to do trivial CSE of loads and read-only calls.
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On 176.gcc, this catches 13090 loads and calls, and increases the
number of simple instructions CSE'd from 29658 to 36208.
llvm-svn: 122727
2011-01-03 03:18:43 +00:00
79d83067ee
rename InstValue to SimpleValue, add some comments.
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llvm-svn: 122725
2011-01-03 02:20:48 +00:00
d815f69b30
Allocate nodes for the scoped hash table from a recyling bump pointer
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allocator. This speeds up early cse by about 20%
llvm-svn: 122723
2011-01-03 01:42:46 +00:00
02a9776b64
reduce redundancy in the hashing code and other misc cleanups.
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llvm-svn: 122720
2011-01-03 01:10:08 +00:00
0844c76f9a
fix some pastos
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llvm-svn: 122718
2011-01-02 23:29:58 +00:00
8fac5db251
add DEBUG and -stats output to earlycse.
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Teach it to CSE the rest of the non-side-effecting instructions.
llvm-svn: 122716
2011-01-02 23:19:45 +00:00
18ae5436b1
Enhance earlycse to do CSE of casts, instsimplify and die.
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Add a testcase.
llvm-svn: 122715
2011-01-02 23:04:14 +00:00
704541bb23
sketch out a new early cse pass. No functionality yet.
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llvm-svn: 122713
2011-01-02 21:47:05 +00:00
Eli Friedman