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74 Commits

Author SHA1 Message Date
Dan Gohman
7f73a0c1e4 Don't hoist or sink instructions with physreg uses if the physreg is 
allocatable. Even if it doesn't appear to have any defs, it may latter
on after register allocation.

llvm-svn: 82834
 2009-09-26 02:34:00 +00:00
Dan Gohman
7c98ffa2b6 Fix MachineSink to be able to sink instructions that use physical registers 
which have no defs anywhere in the function. In particular, this fixes sinking
of instructions that reference RIP on x86-64, which is currently being modeled
as a register.

llvm-svn: 82815
 2009-09-25 22:53:29 +00:00
Dan Gohman
7b662b75a7 Simplify this code by using use_iterator instead of reg_iterator 
and skipping the defs.

llvm-svn: 82811
 2009-09-25 22:24:52 +00:00
Chris Lattner
9a542aae19 remove std::ostream versions of printing stuff for MBB and MF, 
upgrading a few things to use raw_ostream

llvm-svn: 79811
 2009-08-23 03:13:20 +00:00
Bill Wendling
583b46267f Convert DOUT to DEBUG(errs()...). 
llvm-svn: 79755
 2009-08-22 20:26:23 +00:00
Dan Gohman
a151796c03 Various comment fixes. 
llvm-svn: 78139
 2009-08-05 01:19:01 +00:00
Dan Gohman
4529d71681 Use setPreservesAll and setPreservesCFG in CodeGen passes. 
llvm-svn: 77754
 2009-07-31 23:37:33 +00:00
Chris Lattner
0577b8e2ef fix two problems with machine sinking: 
1. Sinking would crash when the first instruction of a block was
   sunk due to iterator problems.
2. Instructions could be sunk to their current block, causing an
   infinite loop.

This fixes PR3968

llvm-svn: 68787
 2009-04-10 16:38:36 +00:00
Evan Cheng
9428fd271c Fix PR3522. It's not safe to sink into landing pad BB's. 
llvm-svn: 64582
 2009-02-15 08:36:12 +00:00
Evan Cheng
cf71da05b0 Don't sink the instruction if TargetRegisterInfo::isSafeToMoveRegClassDefs doesn't think it's safe. This works around PR1911. 
llvm-svn: 63994
 2009-02-07 01:21:47 +00:00
Dan Gohman
8271066844 Tidy up #includes, deleting a bunch of unnecessary #includes. 
llvm-svn: 61715
 2009-01-05 17:59:02 +00:00
Dan Gohman
30c5ce1b7d Switch the MachineOperand accessors back to the short names like 
isReg, etc., from isRegister, etc.

llvm-svn: 57006
 2008-10-03 15:45:36 +00:00
Dan Gohman
fa32c7c6d9 Remove isImm(), isReg(), and friends, in favor of 
isImmediate(), isRegister(), and friends, to avoid confusion
about having two different names with the same meaning. I'm
not attached to the longer names, and would be ok with
changing to the shorter names if others prefer it.

llvm-svn: 56189
 2008-09-13 17:58:21 +00:00
Dan Gohman
e1f9be27bc Tidy up several unbeseeming casts from pointer to intptr_t. 
llvm-svn: 55779
 2008-09-04 17:05:41 +00:00
Dan Gohman
bab18cae46 Clean up the use of static and anonymous namespaces. This turned up 
several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017
 2008-05-13 00:00:25 +00:00
Evan Cheng
b9fc5d6d07 Refactor some code out of MachineSink into a MachineInstr query. 
llvm-svn: 48311
 2008-03-13 00:44:09 +00:00
Dan Gohman
cabaec582f Rename MRegisterInfo to TargetRegisterInfo. 
llvm-svn: 46930
 2008-02-10 18:45:23 +00:00
Chris Lattner
efa13b2edd implement support for sinking a load out the bottom of a block that 
has no stores between the load and the end of block.  This works 
great and sinks hundreds of stores, but we can't turn it on because
machineinstrs don't have volatility information and we don't want to
sink volatile stores :(

llvm-svn: 45894
 2008-01-12 00:17:41 +00:00
Chris Lattner
bfffa4f21e Simplify the side effect stuff a bit more and make licm/sinking 
both work right according to the new flags.

This removes the TII::isReallySideEffectFree predicate, and adds
TII::isInvariantLoad. 

It removes NeverHasSideEffects+MayHaveSideEffects and adds
UnmodeledSideEffects as machine instr flags.  Now the clients
can decide everything they need.

I think isRematerializable can be implemented in terms of the
flags we have now, though I will let others tackle that.

llvm-svn: 45843
 2008-01-10 23:08:24 +00:00
Chris Lattner
e5b817779c Clamp down on sinking of lots of instructions. 
llvm-svn: 45841
 2008-01-10 22:35:15 +00:00
Chris Lattner
0d444b96ac The current impl is really trivial, add some comments about how it can be made better. 
llvm-svn: 45625
 2008-01-05 06:47:58 +00:00
Chris Lattner
9e7943159e don't sink anything with side effects, this makes lots of stuff work, but sinks almost nothing. 
llvm-svn: 45617
 2008-01-05 02:33:22 +00:00
Chris Lattner
377c720459 fix a common crash. 
llvm-svn: 45614
 2008-01-05 01:39:17 +00:00
Chris Lattner
f4972fa569 Add a really quick hack at a machine code sinking pass, enabled with --enable-sinking. 
It is missing validity checks, so it is known broken.  However, it is powerful enough
to compile this contrived code:

void test1(int C, double A, double B, double *P) {
  double Tmp = A*A+B*B;
  *P = C ? Tmp : A;
}

into:

_test1:
	movsd	8(%esp), %xmm0
	cmpl	$0, 4(%esp)
	je	LBB1_2	# entry
LBB1_1:	# entry
	movsd	16(%esp), %xmm1
	mulsd	%xmm1, %xmm1
	mulsd	%xmm0, %xmm0
	addsd	%xmm1, %xmm0
LBB1_2:	# entry
	movl	24(%esp), %eax
	movsd	%xmm0, (%eax)
	ret

instead of:

_test1:
	movsd	16(%esp), %xmm0
	mulsd	%xmm0, %xmm0
	movsd	8(%esp), %xmm1
	movapd	%xmm1, %xmm2
	mulsd	%xmm2, %xmm2
	addsd	%xmm0, %xmm2
	cmpl	$0, 4(%esp)
	je	LBB1_2	# entry
LBB1_1:	# entry
	movapd	%xmm2, %xmm1
LBB1_2:	# entry
	movl	24(%esp), %eax
	movsd	%xmm1, (%eax)
	ret

woo.

llvm-svn: 45570
 2008-01-04 07:36:53 +00:00