ea5c6be766
Run codegen dce pass for all targets at all optimization levels. Previously it's
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only run for x86 with fastisel. I've found it being very effective in
eliminating some obvious dead code as result of formal parameter lowering
especially when tail call optimization eliminated the need for some of the loads
from fixed frame objects. It also shrinks a number of the tests. A couple of
tests no longer make sense and are now eliminated.
llvm-svn: 95493
2010-02-06 09:07:11 +00:00
6eb8e13236
If the only use of something is a DEBUG_VALUE, don't
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let that stop it from being deleted, and change the
DEBUG_VALUE value to undef.
llvm-svn: 94694
2010-01-27 22:12:36 +00:00
7af1efc1ae
Change errs() to dbgs().
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llvm-svn: 92496
2010-01-04 19:10:20 +00:00
974e12b2d3
Remove includes of Support/Compiler.h that are no longer needed after the
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VISIBILITY_HIDDEN removal.
llvm-svn: 85043
2009-10-25 06:57:41 +00:00
02d5f77d26
Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces.
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Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.
llvm-svn: 85042
2009-10-25 06:33:48 +00:00
87b02d5bbc
Factor out LiveIntervalAnalysis' code to determine whether an instruction
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is trivially rematerializable and integrate it into
TargetInstrInfo::isTriviallyReMaterializable. This way, all places that
need to know whether an instruction is rematerializable will get the
same answer.
This enables the useful parts of the aggressive-remat option by
default -- using AliasAnalysis to determine whether a memory location
is invariant, and removes the questionable parts -- rematting operations
with virtual register inputs that may not be live everywhere.
llvm-svn: 83687
2009-10-09 23:27:56 +00:00
b447173dc3
Convert DOUT to DEBUG(errs()...).
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llvm-svn: 79748
2009-08-22 20:04:03 +00:00
e02f9ba9b1
Add const qualifiers.
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llvm-svn: 78663
2009-08-11 15:13:43 +00:00
0b3bcee284
Rename AliasSet to SubRegs, to reflect changes in the surrounding code.
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llvm-svn: 57618
2008-10-16 01:06:18 +00:00
bf293c48db
Fix a subtle bug in DeadMachineInstructionElim's liveness
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computation. A def of a register doesn't necessarily kill
live super-registers.
llvm-svn: 57614
2008-10-16 00:11:23 +00:00
0d1e9a8e04
Switch the MachineOperand accessors back to the short names like
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isReg, etc., from isRegister, etc.
llvm-svn: 57006
2008-10-03 15:45:36 +00:00
b873aa632c
Add debug output to this pass.
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llvm-svn: 56602
2008-09-25 01:06:50 +00:00
6b33aa4d96
Refactor the logic for testing if an instruction is dead into a
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separate method.
llvm-svn: 56531
2008-09-24 00:27:38 +00:00
1e2b282be3
Set SetStore to false, to allow this pass to delete
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dead loads.
llvm-svn: 56529
2008-09-24 00:07:08 +00:00
676145f02d
Now that DeadMachineInstructionElim is basically working
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correctly, it's not necessary to explicitly remove registers
from their use-def lists.
llvm-svn: 56509
2008-09-23 22:04:18 +00:00
269999cb03
Track local physical register liveness. This is not the most
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efficient implementation possible, but it's pretty simple and
good enough for the time being.
llvm-svn: 56504
2008-09-23 21:40:44 +00:00
f3d647e00b
Don't consider instructions with implicit physical register
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defs to be necessarily live.
llvm-svn: 56310
2008-09-18 18:22:32 +00:00
c24cd015a7
Add a new MachineInstr-level DCE pass. It is very simple, and is intended to
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be used with fast-isel.
llvm-svn: 56268
2008-09-17 00:43:24 +00:00
Evan Cheng