6200c225e0
- 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.
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- X86 now normalize SCALAR_TO_VECTOR to (BIT_CONVERT (v4i32 SCALAR_TO_VECTOR)). Get rid of X86ISD::S2VEC.
llvm-svn: 47290
2008-02-18 23:04:32 +00:00
fefd0202c9
Correctly fold divide-by-constant, even when faced with overflow.
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llvm-svn: 47287
2008-02-18 22:48:05 +00:00
c589243107
Chris pointed out that it's not necessary to set i64 MUL to Expand
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on x86-32 since i64 itself is not a Legal type. And, update some
comments.
llvm-svn: 47282
2008-02-18 19:34:53 +00:00
b2e4b7adde
- Remove the previous check which broke coalescer-commute3.ll
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- 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).
llvm-svn: 47281
2008-02-18 18:56:31 +00:00
6bb6a55f01
upgrade some tests.
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llvm-svn: 47280
2008-02-18 18:46:39 +00:00
0fddc34485
Add a note
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llvm-svn: 47279
2008-02-18 18:39:23 +00:00
a827205670
Add a note about sext from i1 plus flags use.
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llvm-svn: 47278
2008-02-18 18:30:13 +00:00
a589ee11bb
Don't mark scalar integer multiplication as Expand on x86, since x86
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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
1e3c501cb8
Transforming -A + -B --> -(A + B) isn't safe for FP, thanks
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to Dale for noticing this!
llvm-svn: 47276
2008-02-18 17:50:16 +00:00
0af5601028
minor code simplification, no functionality change.
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llvm-svn: 47275
2008-02-18 17:47:29 +00:00
23fe6630e3
make this just a bit more strict.
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llvm-svn: 47274
2008-02-18 17:33:10 +00:00
85fab3a3ad
Simplify caller updating using a CallSite, as
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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
8ed77c41d8
don't bother calling getUnderlyingObject for non-pointers.
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llvm-svn: 47272
2008-02-18 17:28:21 +00:00
02d2bc8d3e
Fix a missing space in the description of the find-bugs option.
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llvm-svn: 47271
2008-02-18 17:15:45 +00:00
cc01ebbac6
Since we're not checking for the more general AllocationInst first, we need to explicitly check
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that Object is an Argument before casting it to one.
llvm-svn: 47268
2008-02-18 10:11:00 +00:00
0b2c8858df
New helper function getMBBFromIndex() that given an index in any instruction of an MBB returns a pointer the MBB. Reviewed by Evan.
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llvm-svn: 47267
2008-02-18 09:35:30 +00:00
3549553262
Add support to GVN for performing sret return slot optimization. This means that, if an sret function tail calls
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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
a54570d2d2
I got the predicate backwards in my last patch. The comment is correct, the code was not.
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llvm-svn: 47264
2008-02-18 09:22:21 +00:00
bdf7ed9495
This check is not correct for mallocs, so exclude them earlier.
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llvm-svn: 47263
2008-02-18 09:11:02 +00:00
8f90724a53
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.
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llvm-svn: 47262
2008-02-18 08:40:53 +00:00
6b39cb907b
switch simplifycfg from using vectors for most things to smallvectors,
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this speeds it up 2.3% on eon.
llvm-svn: 47261
2008-02-18 07:42:56 +00:00
024f8c8f09
optimize away stackrestore calls that have no intervening alloca or call.
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llvm-svn: 47258
2008-02-18 06:12:38 +00:00
c8ec470b52
upgrade this test.
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llvm-svn: 47257
2008-02-18 06:11:00 +00:00
fa4b673eac
Clarify that 'sret' only applies to pointers, and
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only applies to the first parameter.
llvm-svn: 47256
2008-02-18 04:19:38 +00:00
6110128ed5
Make the definition of the noalias attribute clearer.
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llvm-svn: 47255
2008-02-18 04:09:01 +00:00
c66655e14c
Duncan pointed out that we can fast fail here, because the sret parameter of
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a function must be the first parameter.
llvm-svn: 47254
2008-02-18 04:06:26 +00:00
57a98b7f4b
Fix a comment, and a bug where we weren't applying the tail call logic in cases that failed the first test.
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llvm-svn: 47253
2008-02-18 03:52:21 +00:00
fa2ba5352f
Fix bugs that Chris noticed in my last patch.
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llvm-svn: 47252
2008-02-18 02:31:23 +00:00
0e7fd2f1a8
simplify some code, BreakUpSubtract always returns nonnull now.
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llvm-svn: 47251
2008-02-18 02:18:25 +00:00
8432cc662f
bitcasts of pointers are always pointers.
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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
e41efc7a6d
Add support for setting parameters to CallSite.
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llvm-svn: 47249
2008-02-18 00:10:55 +00:00
c64dfb4317
Add a predicate to Argument to check for the StructRet attribute.
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llvm-svn: 47248
2008-02-17 23:22:28 +00:00
2e3edf193a
Teach getModRefInfo that memcpy, memmove, and memset don't "capture" memory addresses.
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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
cc22601bc3
Fold (-x + -y) -> -(x+y) which promotes better association, fixing
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the second half of PR2047
llvm-svn: 47244
2008-02-17 21:03:36 +00:00
5f08ec854f
fix pasto
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llvm-svn: 47242
2008-02-17 20:54:40 +00:00
a70d138457
Split up subtracts into add+negate if they have a reassociable use or operand
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that is also a subtract. This implements PR2047 and Transforms/Reassociate/subtest2.ll
llvm-svn: 47241
2008-02-17 20:51:26 +00:00
2de8c2d41f
upgrade and simplify this test.
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llvm-svn: 47240
2008-02-17 20:48:43 +00:00
902537cd8d
make the logic for breaking up subtracts more explicit, no
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functionality change.
llvm-svn: 47239
2008-02-17 20:44:51 +00:00
f697c03883
Remove llvm-upgrade.
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llvm-svn: 47238
2008-02-17 20:02:20 +00:00
1f6520842c
move PR2053 to here.
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llvm-svn: 47237
2008-02-17 19:43:57 +00:00
aec0914c80
fix this test.
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llvm-svn: 47232
2008-02-17 00:15:25 +00:00
087ed9fcad
Remove llvm-upgrade
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llvm-svn: 47231
2008-02-17 00:15:09 +00:00
c36fefedf5
Remove llvm-upgrade.
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llvm-svn: 47230
2008-02-17 00:13:09 +00:00
8a67d349fe
this test isn't useful since we added @ notation for globals.
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llvm-svn: 47229
2008-02-17 00:12:03 +00:00
0d43732cd0
this line was commented out.
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llvm-svn: 47228
2008-02-17 00:09:08 +00:00
47f0a20f8f
Remove llvm-upgrade and update tests.
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llvm-svn: 47227
2008-02-16 23:55:46 +00:00
231fe4746b
Removing llvm upgrade, so remove tests specific to llvm-upgrade and update the tests that used it.
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llvm-svn: 47225
2008-02-16 23:27:24 +00:00
573b3f89e4
Remove any 'nest' parameter attributes if the function
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is not passed as an argument to a trampoline intrinsic.
llvm-svn: 47220
2008-02-16 20:56:04 +00:00
2efbc7f9e8
Some micro-optimizations.
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llvm-svn: 47219
2008-02-16 20:53:06 +00:00
fedcf477b5
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.
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llvm-svn: 47213
2008-02-16 14:46:26 +00:00
Evan Cheng