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Author SHA1 Message Date
Dan Gohman
70b9b2f77f 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.

llvm-svn: 47277
 2008-02-18 17:55:26 +00:00
Chris Lattner
a378b03483 Transforming -A + -B --> -(A + B) isn't safe for FP, thanks 
to Dale for noticing this!

llvm-svn: 47276
 2008-02-18 17:50:16 +00:00
Chris Lattner
a3318d17d4 minor code simplification, no functionality change. 
llvm-svn: 47275
 2008-02-18 17:47:29 +00:00
Chris Lattner
a6dc8aaa3f make this just a bit more strict. 
llvm-svn: 47274
 2008-02-18 17:33:10 +00:00
Duncan Sands
a85448506d Simplify caller updating using a CallSite, as 
requested by Chris.  While there, do the same
for an existing function committed by someone
called "lattner" :)

llvm-svn: 47273
 2008-02-18 17:32:13 +00:00
Chris Lattner
57eff5b5f5 don't bother calling getUnderlyingObject for non-pointers. 
llvm-svn: 47272
 2008-02-18 17:28:21 +00:00
Dan Gohman
a248482a22 Fix a missing space in the description of the find-bugs option. 
llvm-svn: 47271
 2008-02-18 17:15:45 +00:00
Owen Anderson
f3107c8546 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.

llvm-svn: 47268
 2008-02-18 10:11:00 +00:00
Roman Levenstein
a7d4ae1435 New helper function getMBBFromIndex() that given an index in any instruction of an MBB returns a pointer the MBB. Reviewed by Evan. 
llvm-svn: 47267
 2008-02-18 09:35:30 +00:00
Owen Anderson
7b092ea631 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.

llvm-svn: 47265
 2008-02-18 09:24:53 +00:00
Owen Anderson
e4e1706f95 I got the predicate backwards in my last patch. The comment is correct, the code was not. 
llvm-svn: 47264
 2008-02-18 09:22:21 +00:00
Owen Anderson
1b743c32fd This check is not correct for mallocs, so exclude them earlier. 
llvm-svn: 47263
 2008-02-18 09:11:02 +00:00
Evan Cheng
6eeae5bd62 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. 
llvm-svn: 47262
 2008-02-18 08:40:53 +00:00
Chris Lattner
b22dbdf4fc switch simplifycfg from using vectors for most things to smallvectors, 
this speeds it up 2.3% on eon.

llvm-svn: 47261
 2008-02-18 07:42:56 +00:00
Chris Lattner
9851db050b optimize away stackrestore calls that have no intervening alloca or call. 
llvm-svn: 47258
 2008-02-18 06:12:38 +00:00
Chris Lattner
dd489bf3eb upgrade this test. 
llvm-svn: 47257
 2008-02-18 06:11:00 +00:00
Duncan Sands
0dcb894d50 Clarify that 'sret' only applies to pointers, and 
only applies to the first parameter.

llvm-svn: 47256
 2008-02-18 04:19:38 +00:00
Owen Anderson
48d44e0481 Make the definition of the noalias attribute clearer. 
llvm-svn: 47255
 2008-02-18 04:09:01 +00:00
Owen Anderson
18a7d290cb Duncan pointed out that we can fast fail here, because the sret parameter of 
a function must be the first parameter.

llvm-svn: 47254
 2008-02-18 04:06:26 +00:00
Owen Anderson
b0891af18b Fix a comment, and a bug where we weren't applying the tail call logic in cases that failed the first test. 
llvm-svn: 47253
 2008-02-18 03:52:21 +00:00
Owen Anderson
0ef73a5d06 Fix bugs that Chris noticed in my last patch. 
llvm-svn: 47252
 2008-02-18 02:31:23 +00:00
Chris Lattner
0b6ec4a6b2 simplify some code, BreakUpSubtract always returns nonnull now. 
llvm-svn: 47251
 2008-02-18 02:18:25 +00:00
Chris Lattner
d5885d43ef 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.

llvm-svn: 47250
 2008-02-18 02:11:28 +00:00
Owen Anderson
b0dee942db Add support for setting parameters to CallSite. 
llvm-svn: 47249
 2008-02-18 00:10:55 +00:00
Owen Anderson
48dd6a0f96 Add a predicate to Argument to check for the StructRet attribute. 
llvm-svn: 47248
 2008-02-17 23:22:28 +00:00
Owen Anderson
884f6801df 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.

llvm-svn: 47247
 2008-02-17 21:29:08 +00:00
Chris Lattner
2fa904b3af Fold (-x + -y) -> -(x+y) which promotes better association, fixing 
the second half of PR2047

llvm-svn: 47244
 2008-02-17 21:03:36 +00:00
Chris Lattner
51a663a8fe fix pasto 
llvm-svn: 47242
 2008-02-17 20:54:40 +00:00
Chris Lattner
4a34461d64 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 

llvm-svn: 47241
 2008-02-17 20:51:26 +00:00
Chris Lattner
7cd16f34b3 upgrade and simplify this test. 
llvm-svn: 47240
 2008-02-17 20:48:43 +00:00
Chris Lattner
cd6f9cea98 make the logic for breaking up subtracts more explicit, no 
functionality change.

llvm-svn: 47239
 2008-02-17 20:44:51 +00:00
Tanya Lattner
03755061ae Remove llvm-upgrade. 
llvm-svn: 47238
 2008-02-17 20:02:20 +00:00
Chris Lattner
3e886fa85a move PR2053 to here. 
llvm-svn: 47237
 2008-02-17 19:43:57 +00:00
Chris Lattner
1ce2265908 fix this test. 
llvm-svn: 47232
 2008-02-17 00:15:25 +00:00
Tanya Lattner
bcf113b2ca Remove llvm-upgrade 
llvm-svn: 47231
 2008-02-17 00:15:09 +00:00
Tanya Lattner
71db645ff2 Remove llvm-upgrade. 
llvm-svn: 47230
 2008-02-17 00:13:09 +00:00
Chris Lattner
37c93d2a82 this test isn't useful since we added @ notation for globals. 
llvm-svn: 47229
 2008-02-17 00:12:03 +00:00
Chris Lattner
52d5239f6d this line was commented out. 
llvm-svn: 47228
 2008-02-17 00:09:08 +00:00
Tanya Lattner
c08b5f0208 Remove llvm-upgrade and update tests. 
llvm-svn: 47227
 2008-02-16 23:55:46 +00:00
Tanya Lattner
1ffe4f2e88 Removing llvm upgrade, so remove tests specific to llvm-upgrade and update the tests that used it. 
llvm-svn: 47225
 2008-02-16 23:27:24 +00:00
Duncan Sands
cd0325cce1 Remove any 'nest' parameter attributes if the function 
is not passed as an argument to a trampoline intrinsic.

llvm-svn: 47220
 2008-02-16 20:56:04 +00:00
Duncan Sands
753597d1cf Some micro-optimizations. 
llvm-svn: 47219
 2008-02-16 20:53:06 +00:00
Andrew Lenharth
da54523742 I cannot find a libgcc function for this builtin. Therefor expanding it to a noop (which is how it use to be treated). If someone who knows the x86 backend better than me could tell me how to get a lock prefix on an instruction, that would be nice to complete x86 support. 
llvm-svn: 47213
 2008-02-16 14:46:26 +00:00
Duncan Sands
22ebf8b70f Teach LegalizeTypes how to expand the operands of 
br_cc.  This fixes 5 "make check" failures.

llvm-svn: 47212
 2008-02-16 10:29:26 +00:00
Duncan Sands
4499f2fd9e Try to clarify which compilers can be used for the 
build.

llvm-svn: 47211
 2008-02-16 09:47:41 +00:00
Evan Cheng
dd13a96a60 Refactor some code; check if commuteInstruction is able to commute the instruction. 
llvm-svn: 47208
 2008-02-16 02:32:17 +00:00
Andrew Lenharth
c178981b85 llvm.memory.barrier, and impl for x86 and alpha 
llvm-svn: 47204
 2008-02-16 01:24:58 +00:00
Bill Wendling
34dd48a10c Fix typos. 
llvm-svn: 47200
 2008-02-16 01:09:25 +00:00
Dan Gohman
a9386d8501 Rename CountMemOperands to ComputeMemOperandsEnd to reflect what 
it actually does. Simplify CountOperands a little by reusing
ComputeMemOperandsEnd. And reword some comments for both.

llvm-svn: 47198
 2008-02-16 00:36:48 +00:00
Dan Gohman
9ce252af04 Revert 47177, which was incorrect. 
llvm-svn: 47196
 2008-02-16 00:25:40 +00:00