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Author SHA1 Message Date
Chris Lattner
ce2bcc8839 Don't fold and's into test instructions if they have multiple uses. 
This compiles test-nofold.ll into:

_test:
	movl	$15, %ecx
	andl	4(%esp), %ecx
	testl	%ecx, %ecx
	movl	$42, %eax
	cmove	%ecx, %eax
	ret

instead of:
_test:
	movl	4(%esp), %eax
	movl	%eax, %ecx
	andl	$15, %ecx
	testl	$15, %eax
	movl	$42, %eax
	cmove	%ecx, %eax
	ret



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47330 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 17:37:35 +00:00
Duncan Sands
ec5ec88d15 Fix a compiler warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47328 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 09:28:48 +00:00
Chris Lattner
75542bd56b remove the LowerSelect pass. The last client was the old Sparc backend, which is long dead by now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47323 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 07:49:17 +00:00
Chris Lattner
15f166c7b6 remove the lower packed pass. It can never work and even the parts that 
could work don't work fully.  This fixes PR1705.  Oh yeah, we don't have
packed types anymore either ;-)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47322 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 07:39:17 +00:00
Owen Anderson
967552e7ec Refactor this method a bit, and correct a test that was completely wrong but happened to work out anyways. :-) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47321 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 07:07:51 +00:00
Chris Lattner
e42ce73c37 isa+cast -> dyncast. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47320 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:53:20 +00:00
Chris Lattner
0a76a621a4 simplify this code again, try 2 :) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47319 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:52:38 +00:00
Owen Anderson
9cffa9a6ed Fix a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47318 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:51:23 +00:00
Owen Anderson
851bfff50f In addition to arguments passed to it, memcpy (and all other calls) can ModRef pointers that alias their arguments as well. This fixes PR2057. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47317 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:47:18 +00:00
Owen Anderson
61c24e96b1 Major improvements to yesterday's return slot optimization. Remove some unneccessary constraints, 
and add some others that should have been in from the first place.  Document the whole thing better.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47315 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:35:43 +00:00
Chris Lattner
46acf85b97 Fix some minor issues folding undef, PR2052 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47314 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:22:12 +00:00
Chris Lattner
50b2ca4c73 fdiv/frem of undef can produce undef, because the undef operand 
can be a SNaN.  We could be more aggressive and turn this into 
unreachable, but that is less nice, and not really worth it.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47313 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 06:12:18 +00:00
Chris Lattner
389056110f regenerate 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47312 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 04:36:25 +00:00
Chris Lattner
689e8b294e Fix PR2060 by rejecting invalid types for integer constants. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47311 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 04:36:07 +00:00
Owen Anderson
fa113f8155 Factor the profitability check for return slot optimization out into a static function. 
At some point in the future, this check will become smarter.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47310 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 03:27:34 +00:00
Owen Anderson
c0755a6f98 An sret parameter is required to be the first parameter, so there's no need to loop 
over all the parameters of the callee looking for it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47309 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 03:15:29 +00:00
Owen Anderson
7acc0af95a Cleanup some of my patches from yesterday. Refactor the check for which xform 
to apply to a memcpy into processInstruction.  Also, fix a bug in the check due to
missing braces.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47307 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 03:09:45 +00:00
Owen Anderson
c2580ab9b0 Fix Transforms/GVN/memcpy.ll, which Chris broke in r47275 by reordering the branches. memcpy's are a kind of CallInst. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47305 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 02:53:23 +00:00
Evan Cheng
31886dbe37 PR1909: Tail merging pass ran wild. It makes no sense to merge blocks in order to save a single instruction since a branch will be inserted for each BB. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47301 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 02:09:37 +00:00
Evan Cheng
422cba6ed0 Me not like duplicated comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47300 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-19 02:05:16 +00:00
Evan Cheng
efec751a1b - When DAG combiner is folding a bit convert into a BUILD_VECTOR, it should check if it's essentially a SCALAR_TO_VECTOR. Avoid turning (v8i16) <10, u, u, u> to <10, 0, u, u, u, u, u, u>. Instead, simply convert it to a SCALAR_TO_VECTOR of the proper type. 
- X86 now normalize SCALAR_TO_VECTOR to (BIT_CONVERT (v4i32 SCALAR_TO_VECTOR)). Get rid of X86ISD::S2VEC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47290 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 23:04:32 +00:00
Nick Lewycky
e0cfecf47d Correctly fold divide-by-constant, even when faced with overflow. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47287 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 22:48:05 +00:00
Dan Gohman
b00ee21f21 Chris pointed out that it's not necessary to set i64 MUL to Expand 
on x86-32 since i64 itself is not a Legal type. And, update some
comments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47282 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 19:34:53 +00:00
Evan Cheng
a9407f5937 - Remove the previous check which broke coalescer-commute3.ll 
- For now, conservatively ignore copy MI whose source is a physical register. Commuting its def MI can cause a physical register live interval to be live through a loop (since we know it's live coming into the def MI).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47281 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 18:56:31 +00:00
Chris Lattner
7c4e9a44a4 upgrade some tests. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47280 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 18:46:39 +00:00
Nate Begeman
e9fe65c973 Add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47279 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 18:39:23 +00:00
Chris Lattner
92b416f64e Add a note about sext from i1 plus flags use. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47278 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 18:30:13 +00:00
Dan Gohman
339ffedca9 Don't mark scalar integer multiplication as Expand on x86, since x86 
has plain one-result scalar integer multiplication instructions.
This avoids expanding such instructions into MUL_LOHI sequences that
must be special-cased at isel time, and avoids the problem with that
code that provented memory operands from being folded.

This fixes PR1874, addressesing the most common case. The uncommon
cases of optimizing multiply-high operations will require work
in DAGCombiner.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47277 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 17:55:26 +00:00
Chris Lattner
e10c0b9d66 Transforming -A + -B --> -(A + B) isn't safe for FP, thanks 
to Dale for noticing this!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47276 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 17:50:16 +00:00
Chris Lattner
913b19f6fc minor code simplification, no functionality change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47275 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 17:47:29 +00:00
Duncan Sands
548448a317 Simplify caller updating using a CallSite, as 
requested by Chris.  While there, do the same
for an existing function committed by someone
called "lattner" :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47273 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 17:32:13 +00:00
Chris Lattner
bb494bcb0e don't bother calling getUnderlyingObject for non-pointers. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47272 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 17:28:21 +00:00
Owen Anderson
ef562471ce Since we're not checking for the more general AllocationInst first, we need to explicitly check 
that Object is an Argument before casting it to one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47268 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 10:11:00 +00:00
Roman Levenstein
8dd25288f9 New helper function getMBBFromIndex() that given an index in any instruction of an MBB returns a pointer the MBB. Reviewed by Evan. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47267 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 09:35:30 +00:00
Owen Anderson
5aa4f2a085 Add support to GVN for performing sret return slot optimization. This means that, if an sret function tail calls 
another sret function, it should pass its own sret parameter to the tail callee, allowing it to fill in the correct
return value.  llvm-gcc does not emit this by default.  Instead, it allocates space in the caller for the sret of
the tail call and then uses memcpy to copy the result into the caller's sret parameter.  This optimization detects
and optimizes that case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47265 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 09:24:53 +00:00
Owen Anderson
874a892c99 I got the predicate backwards in my last patch. The comment is correct, the code was not. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47264 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 09:22:21 +00:00
Owen Anderson
26d914ada3 This check is not correct for mallocs, so exclude them earlier. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47263 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 09:11:02 +00:00
Evan Cheng
96cfff0906 For now, avoid commuting def MI for copy MI's whose source is not killed. That simply trade a live interval for another and because only the non-two-address operands can be folded into loads, may end up pessimising code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47262 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 08:40:53 +00:00
Chris Lattner
8244243a31 switch simplifycfg from using vectors for most things to smallvectors, 
this speeds it up 2.3% on eon.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47261 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 07:42:56 +00:00
Chris Lattner
bf1d8a7099 optimize away stackrestore calls that have no intervening alloca or call. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47258 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 06:12:38 +00:00
Owen Anderson
9eb948b466 Duncan pointed out that we can fast fail here, because the sret parameter of 
a function must be the first parameter.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47254 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 04:06:26 +00:00
Owen Anderson
ae708a3d91 Fix a comment, and a bug where we weren't applying the tail call logic in cases that failed the first test. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47253 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 03:52:21 +00:00
Owen Anderson
9aa7c35cee Fix bugs that Chris noticed in my last patch. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47252 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 02:31:23 +00:00
Chris Lattner
d5b8d92b9f simplify some code, BreakUpSubtract always returns nonnull now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47251 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 02:18:25 +00:00
Chris Lattner
0ab5a4ae55 bitcasts of pointers are always pointers. 
If we see a memcpy of a pointer, make sure to check later
uses of the pointer as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47250 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 02:11:28 +00:00
Owen Anderson
7d54254c9c Add a predicate to Argument to check for the StructRet attribute. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47248 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 23:22:28 +00:00
Owen Anderson
9b636cb338 Teach getModRefInfo that memcpy, memmove, and memset don't "capture" memory addresses. 
Also, noalias arguments are be considered "like" stack allocated ones for this purpose, because
the only way they can be modref'ed is if they escape somewhere in the current function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47247 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 21:29:08 +00:00
Chris Lattner
dd12f96c5e Fold (-x + -y) -> -(x+y) which promotes better association, fixing 
the second half of PR2047


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47244 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 21:03:36 +00:00
Chris Lattner
5329bb22e9 fix pasto 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47242 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 20:54:40 +00:00
Chris Lattner
0b0803ae15 Split up subtracts into add+negate if they have a reassociable use or operand 
that is also a subtract.  This implements PR2047 and Transforms/Reassociate/subtest2.ll 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47241 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 20:51:26 +00:00