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21477 Commits

Author SHA1 Message Date
Dan Gohman
630f3a713c Fix a typo in a comment. 
llvm-svn: 46513
 2008-01-29 12:43:50 +00:00
Dan Gohman
241714222a Fix 80-col violations. 
llvm-svn: 46510
 2008-01-29 12:09:55 +00:00
Dan Gohman
daa38f69cf Remove top-level const qualifiers from casts, avoiding associated 
compiler warnings.

llvm-svn: 46509
 2008-01-29 12:08:20 +00:00
Dan Gohman
4463225e99 Fix a typo in a comment. 
llvm-svn: 46508
 2008-01-29 12:07:11 +00:00
Dan Gohman
522401f26e Add explicit keywords. 
llvm-svn: 46506
 2008-01-29 11:36:12 +00:00
Chris Lattner
83f411c586 eliminate additions of 0.0 when they are obviously dead. This has to be careful to 
avoid turning -0.0 + 0.0 -> -0.0 which is incorrect.

llvm-svn: 46499
 2008-01-29 06:52:45 +00:00
Duncan Sands
390baa691d Use getPreferredAlignmentLog or getPreferredAlignment 
to get the alignment of global variables, rather than
using hand-made versions.

llvm-svn: 46495
 2008-01-29 06:23:44 +00:00
Owen Anderson
96b9e5423a Add support for eliminating memcpy's at the end of functions. Also fix some errors I noticed in 
the handling of eliminating stores to byval arguments.

llvm-svn: 46494
 2008-01-29 06:18:36 +00:00
Owen Anderson
fc41146d15 RegAllocBigBlock doesn't need LiveVariables either. 
llvm-svn: 46488
 2008-01-29 02:32:13 +00:00
Nate Begeman
3eeac138f9 Properly expand extract-element for non-power-of-2 codegen 
llvm-svn: 46486
 2008-01-29 02:24:00 +00:00
Dale Johannesen
f12104ce4b Handle 'X' constraint in asm's better. 
llvm-svn: 46485
 2008-01-29 02:21:21 +00:00
Devang Patel
86ff705c22 Filter loops that subtract induction variables. 
These loops are not yet handled.

Fix PR 1912.

llvm-svn: 46484
 2008-01-29 02:20:41 +00:00
Scott Michel
dc780aeb57 Overhaul Cell SPU's addressing mode internals so that there are now 
only two addressing mode nodes, SPUaform and SPUindirect (vice the
three previous ones, SPUaform, SPUdform and SPUxform). This improves
code somewhat because we now avoid using reg+reg addressing when
it can be avoided. It also simplifies the address selection logic,
which was the main point for doing this.

Also, for various global variables that would be loaded using SPU's
A-form addressing, prefer D-form offs[reg] addressing, keeping the
base in a register if the variable is used more than once.

llvm-svn: 46483
 2008-01-29 02:16:57 +00:00
Lauro Ramos Venancio
ad2a3eb416 Simplify the code and fix a typo. 
llvm-svn: 46458
 2008-01-28 20:02:51 +00:00
Lauro Ramos Venancio
947e17ae75 Fix fpcmp infinite loop when comparing "29-266" with "29-268". 
llvm-svn: 46455
 2008-01-28 18:23:23 +00:00
Bill Wendling
5b6f587a80 If the function has no machine instructions, then emit a "nop" so that 
the function label isn't associated with something it shouldn't be.

llvm-svn: 46449
 2008-01-28 09:15:03 +00:00
Chris Lattner
dc0c4352bd Transform calls to memcpy into llvm.memcpy calls, patch by Eli Friedman. 
llvm-svn: 46433
 2008-01-28 04:41:43 +00:00
Nick Lewycky
6b070b1b93 Handle some more combinations of extend and icmp. Fixes PR1940. 
llvm-svn: 46431
 2008-01-28 03:48:02 +00:00
Chris Lattner
359756ea4b Fix PR1932 by disabling an xform invalid for fdiv. 
llvm-svn: 46429
 2008-01-28 00:58:18 +00:00
Chris Lattner
7250586ec9 Fix PR1938 by forcing the code that uses an undefined value to branch one 
way or the other.  Rewriting the code itself prevents subsequent analysis
passes from making contradictory conclusions about the code that could 
cause an infeasible path to be made feasible.

llvm-svn: 46427
 2008-01-28 00:32:30 +00:00
Chris Lattner
26ec133a4d Fix PowerPC/./2007-10-18-PtrArithmetic.ll 
llvm-svn: 46424
 2008-01-27 23:32:17 +00:00
Chris Lattner
3d4fa8f00f fix a crash on CodeGen/X86/vector-rem.ll 
llvm-svn: 46422
 2008-01-27 23:21:58 +00:00
Owen Anderson
1078560f26 Reg alloc doesn't really need LiveVariables. 
llvm-svn: 46420
 2008-01-27 22:00:00 +00:00
Nick Lewycky
cd28ef8950 Be more careful modifying the use_list while also iterating through it. 
llvm-svn: 46417
 2008-01-27 18:35:00 +00:00
Duncan Sands
e77256b325 Revert r46393: readonly/readnone functions are no 
longer allowed to write through byval arguments.

llvm-svn: 46416
 2008-01-27 18:12:58 +00:00
Chris Lattner
2ab1fd3824 Implement some dag combines that allow doing fneg/fabs/fcopysign in integer 
registers if used by a bitconvert or using a bitconvert.  This allows us to
avoid constant pool loads and use cheaper integer instructions when the
values come from or end up in integer regs anyway.  For example, we now 
compile CodeGen/X86/fp-in-intregs.ll to:

_test1:
	movl	$2147483648, %eax
	xorl	4(%esp), %eax
	ret
_test2:
	movl	$1065353216, %eax
	orl	4(%esp), %eax
	andl	$3212836864, %eax
	ret

Instead of:
_test1:
	movss	4(%esp), %xmm0
	xorps	LCPI2_0, %xmm0
	movd	%xmm0, %eax
	ret
_test2:
	movss	4(%esp), %xmm0
	andps	LCPI3_0, %xmm0
	movss	LCPI3_1, %xmm1
	andps	LCPI3_2, %xmm1
	orps	%xmm0, %xmm1
	movd	%xmm1, %eax
	ret

bitconverts can happen due to various calling conventions that require
fp values to passed in integer regs in some cases, e.g. when returning
a complex.

llvm-svn: 46414
 2008-01-27 17:42:27 +00:00
Chris Lattner
39c52e030b add a note 
llvm-svn: 46413
 2008-01-27 07:31:41 +00:00
Chris Lattner
f4bc2c5718 Use fldz and fld1 for long double constants instead of a constant pool load. 
llvm-svn: 46411
 2008-01-27 06:19:31 +00:00
Bill Wendling
629a569ce9 The CorrelatedExpressionElimination pass is known to be buggy. Remove it. 
This fixes PR1769.

llvm-svn: 46408
 2008-01-27 06:11:41 +00:00
Chris Lattner
f93e3d7dd7 For long double constants, print an approximation of their value to the .s file to make it easier to read. 
llvm-svn: 46407
 2008-01-27 06:09:28 +00:00
Chris Lattner
aa553aa0c1 Fold fptrunc(add (fpextend x), (fpextend y)) -> add(x,y), as GCC does. 
llvm-svn: 46406
 2008-01-27 05:29:54 +00:00
Chris Lattner
00183edf55 Add some notes. 
llvm-svn: 46405
 2008-01-26 20:12:07 +00:00
Chris Lattner
6124c0eb2d Remove some code for inferring alignment info from the x86 backend 
now that the dag combiner does it.

llvm-svn: 46404
 2008-01-26 20:07:42 +00:00
Chris Lattner
682346a7b0 Infer alignment of loads and increase their alignment when we can tell they are 
from the stack.  This allows us to compile stack-align.ll to:

_test:
	movsd	LCPI1_0, %xmm0
	movapd	%xmm0, %xmm1
***	andpd	4(%esp), %xmm1
	andpd	_G, %xmm0
	addsd	%xmm1, %xmm0
	movl	20(%esp), %eax
	movsd	%xmm0, (%eax)
	ret

instead of:

_test:
	movsd	LCPI1_0, %xmm0
**	movsd	4(%esp), %xmm1
**	andpd	%xmm0, %xmm1
	andpd	_G, %xmm0
	addsd	%xmm1, %xmm0
	movl	20(%esp), %eax
	movsd	%xmm0, (%eax)
	ret

llvm-svn: 46401
 2008-01-26 19:45:50 +00:00
Bill Wendling
7b83688c73 If there's no instructions being emitted on X86 for a function, emit a 
nop. Emit the nop directly for PPC.

llvm-svn: 46398
 2008-01-26 09:03:52 +00:00
Bill Wendling
1c92468074 If there are no machine instructions emitted for a function, then insert 
a "nop" instruction so that we don't have the function's label associated
with something that it's not supposed to be associated with.

llvm-svn: 46394
 2008-01-26 06:51:24 +00:00
Duncan Sands
792234c366 Create an explicit copy for byval parameters even 
when inlining a readonly function.

llvm-svn: 46393
 2008-01-26 06:41:49 +00:00
Bill Wendling
1e56a2ffb6 If we have a function like this: 
void bork() {
  int *address = 0;
  *address = 0;
}

It's compiled into LLVM code that looks like this:

define void @bork() noreturn nounwind  {
entry:
        unreachable
}

This is bad on some platforms (like PPC) because it will generate the label for
the function but no body. The label could end up being associated with some
non-code related stuff, like a section. This places a "trap" instruction if the
SimplifyCFG pass removed all code from the function leaving only one
"unreachable" instruction.

llvm-svn: 46387
 2008-01-26 01:43:44 +00:00
Chris Lattner
53a98f46fd Fix some bugs in SimplifyNodeWithTwoResults where it would call deletenode to 
delete a node even if it was not dead in some cases.  Instead, just add it to
the worklist.  Also, make sure to use the CombineTo methods, as it was doing
things that were unsafe: the top level combine loop could touch dangling memory.

This fixes CodeGen/Generic/2008-01-25-dag-combine-mul.ll

llvm-svn: 46384
 2008-01-26 01:09:19 +00:00
Chris Lattner
8d8b31d5f4 don't bother making x&-1 only to simplify it in dag combine. This commonly occurs expanding i64 ops. 
llvm-svn: 46383
 2008-01-26 01:05:42 +00:00
Chris Lattner
6b56f4031f reduce indentation 
llvm-svn: 46377
 2008-01-25 23:34:24 +00:00
Duncan Sands
10316ffbb2 Do this more neatly. 
llvm-svn: 46369
 2008-01-25 22:06:51 +00:00
Chris Lattner
8c621a474e fix long lines. 
llvm-svn: 46355
 2008-01-25 17:24:52 +00:00
Chris Lattner
00ead854ef JITEmitter.cpp was trying to sync the icache for function stubs, but 
was actually passing a completely incorrect size to sys_icache_invalidate.
Instead of having the JITEmitter do this (which doesn't have the correct 
size), just make the target sync its own stubs.

llvm-svn: 46354
 2008-01-25 16:41:09 +00:00
Owen Anderson
a4ff15c69f DeadStoreElimination can treat byval parameters as if there were alloca's for the purpose of removing end-of-function stores. 
llvm-svn: 46351
 2008-01-25 10:10:33 +00:00
Chris Lattner
59dc439330 Add skeletal code to increase the alignment of loads and stores when 
we can infer it.  This will eventually help stuff, though it doesn't
do much right now because all fixed FI's have an alignment of 1.

llvm-svn: 46349
 2008-01-25 07:20:16 +00:00
Chris Lattner
1ce075bcaa move MachineFrameInfo::CreateFixedObject out of line, give MachineFrameInfo 
a reference to TargetFrameInfo.  Rearrange order of fields in StackObject to
save a word.

llvm-svn: 46348
 2008-01-25 07:19:06 +00:00
Chris Lattner
74d4792eb2 include alignment and volatility information in -view-*-dags output 
llvm-svn: 46347
 2008-01-25 06:40:45 +00:00
Chris Lattner
726a4e45e5 optimize fxor like for 
llvm-svn: 46345
 2008-01-25 06:14:17 +00:00
Chris Lattner
79076fdf2a Add target-specific dag combines for FAND(x,0) and FOR(x,0). This allows 
us to compile:

double test(double X) {
  return copysign(0.0, X);
}

into:

_test:
	andpd	LCPI1_0(%rip), %xmm0
	ret

instead of:
_test:
	pxor	%xmm1, %xmm1
	andpd	LCPI1_0(%rip), %xmm1
	movapd	%xmm0, %xmm2
	andpd	LCPI1_1(%rip), %xmm2
	movapd	%xmm1, %xmm0
	orpd	%xmm2, %xmm0
	ret

llvm-svn: 46344
 2008-01-25 05:46:26 +00:00