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Commit Graph

34 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
f27229ee5a Track live-out physical registers in MachineDCE.
Patch by Sanjoy Das!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133910 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-27 15:00:36 +00:00
Jakob Stoklund Olesen
c9df025e33 Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic.
These functions not longer assert when passed 0, but simply return false instead.

No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123155 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-10 02:58:51 +00:00
Evan Cheng
c36b7069b4 Do not model all INLINEASM instructions as having unmodelled side effects.
Instead encode llvm IR level property "HasSideEffects" in an operand (shared
with IsAlignStack). Added MachineInstrs::hasUnmodeledSideEffects() to check
the operand when the instruction is an INLINEASM.

This allows memory instructions to be moved around INLINEASM instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123044 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-07 23:50:32 +00:00
Owen Anderson
081c34b725 Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
must be called in the pass's constructor.  This function uses static dependency declarations to recursively initialize
the pass's dependencies.

Clients that only create passes through the createFooPass() APIs will require no changes.  Clients that want to use the
CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h
before parsing commandline arguments.

I have tested this with all standard configurations of clang and llvm-gcc on Darwin.  It is possible that there are problems
with the static dependencies that will only be visible with non-standard options.  If you encounter any crash in pass
registration/creation, please send the testcase to me directly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-19 17:21:58 +00:00
Owen Anderson
ce665bd2e2 Now with fewer extraneous semicolons!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-07 22:25:06 +00:00
Jakob Stoklund Olesen
f14a648d80 Track liveness of unallocatable, unreserved registers in machine DCE.
Reserved registers are unpredictable, and are treated as always live by machine
DCE.

Allocatable registers are never reserved, and can be used for virtual registers.

Unreserved, unallocatable registers can not be used for virtual registers, but
otherwise behave like a normal allocatable register. Most targets only have
the flag register in this set.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112649 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-31 21:51:05 +00:00
Owen Anderson
90c579de5a Reapply r110396, with fixes to appease the Linux buildbot gods.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-06 18:33:48 +00:00
Owen Anderson
1f74590e9d Revert r110396 to fix buildbots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-06 00:23:35 +00:00
Owen Anderson
9ccaf53ada Don't use PassInfo* as a type identifier for passes. Instead, use the address of the static
ID member as the sole unique type identifier.  Clean up APIs related to this change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110396 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-05 23:42:04 +00:00
Owen Anderson
d13db2c59c Fix batch of converting RegisterPass<> to INTIALIZE_PASS().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109045 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-21 22:09:45 +00:00
Evan Cheng
ac1abde05b Swap parameters of isSafeToMove and isSafeToReMat for consistency.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97578 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-02 19:03:01 +00:00
Dale Johannesen
2d1ec73d94 Rewrite handling of DBG_VALUE; previous algorithm
didn't handle
X =
Y<dead> = use X
DBG_VALUE(X)
I was hoping to avoid this approach as it's slower,
but I don't think it can be done.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95996 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-12 18:40:17 +00:00
Dale Johannesen
39c7a198ea Allow for more than one DBG_VALUE targeting the
same dead instruction.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95890 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-11 18:23:23 +00:00
Bob Wilson
5e2b05a71e Delete dead PHI machine instructions. These can be created due to type
legalization even when the IR-level optimizer has removed dead phis, such
as when the high half of an i64 value is unused on a 32-bit target.
I had to adjust a few test cases that had dead phis.
This is a partial fix for Radar 7627077.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95816 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-10 22:58:57 +00:00
Dale Johannesen
3b1906f48d more comment updates
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95736 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-10 00:44:23 +00:00
Chris Lattner
518bb53485 move target-independent opcodes out of TargetInstrInfo
into TargetOpcodes.h.  #include the new TargetOpcodes.h
into MachineInstr.  Add new inline accessors (like isPHI())
to MachineInstr, and start using them throughout the 
codebase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95687 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-09 19:54:29 +00:00
Evan Cheng
00a99a3584 Run codegen dce pass for all targets at all optimization levels. Previously it's
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95493 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-06 09:07:11 +00:00
Dale Johannesen
9514fcbae5 If the only use of something is a DEBUG_VALUE, don't
let that stop it from being deleted, and change the
DEBUG_VALUE value to undef.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94694 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-27 22:12:36 +00:00
David Greene
26045e25bf Change errs() to dbgs().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92496 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-04 19:10:20 +00:00
Nick Lewycky
f5a86f45e7 Remove includes of Support/Compiler.h that are no longer needed after the
VISIBILITY_HIDDEN removal.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85043 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-25 06:57:41 +00:00
Nick Lewycky
6726b6d75a Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces.
Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85042 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-25 06:33:48 +00:00
Dan Gohman
a70dca156f Factor out LiveIntervalAnalysis' code to determine whether an instruction
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83687 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-09 23:27:56 +00:00
Bill Wendling
9311a22830 Convert DOUT to DEBUG(errs()...).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79748 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-22 20:04:03 +00:00
Dan Gohman
d443ee6884 Add const qualifiers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78663 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-11 15:13:43 +00:00
Dan Gohman
131161bc6e Rename AliasSet to SubRegs, to reflect changes in the surrounding code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57618 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-16 01:06:18 +00:00
Dan Gohman
b382c4dc23 Fix a subtle bug in DeadMachineInstructionElim's liveness
computation. A def of a register doesn't necessarily kill
live super-registers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57614 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-16 00:11:23 +00:00
Dan Gohman
d735b8019b Switch the MachineOperand accessors back to the short names like
isReg, etc., from isRegister, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57006 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-03 15:45:36 +00:00
Dan Gohman
723ac3720f Add debug output to this pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56602 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-25 01:06:50 +00:00
Dan Gohman
3d84a76917 Refactor the logic for testing if an instruction is dead into a
separate method.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56531 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-24 00:27:38 +00:00
Dan Gohman
035268eaf7 Set SetStore to false, to allow this pass to delete
dead loads.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56529 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-24 00:07:08 +00:00
Dan Gohman
b2c3e3fdd9 Now that DeadMachineInstructionElim is basically working
correctly, it's not necessary to explicitly remove registers
from their use-def lists.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56509 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-23 22:04:18 +00:00
Dan Gohman
8468d1a845 Track local physical register liveness. This is not the most
efficient implementation possible, but it's pretty simple and
good enough for the time being.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56504 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-23 21:40:44 +00:00
Dan Gohman
e251b1529f Don't consider instructions with implicit physical register
defs to be necessarily live.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56310 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-18 18:22:32 +00:00
Dan Gohman
d3ead4329e Add a new MachineInstr-level DCE pass. It is very simple, and is intended to
be used with fast-isel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56268 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-17 00:43:24 +00:00