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Author SHA1 Message Date
Mikhail Glushenkov
45f83604cd Documentation: clarify what is meant by 'multiple edges'. 
llvm-svn: 60197
 2008-11-28 00:12:09 +00:00
Chris Lattner
4486266c9d delete ErasePossiblyDeadInstructionTree, replacing uses of it with 
RecursivelyDeleteTriviallyDeadInstructions.

llvm-svn: 60196
 2008-11-27 23:25:44 +00:00
Chris Lattner
8231357a92 Simplify LoopStrengthReduce::DeleteTriviallyDeadInstructions by 
making it use RecursivelyDeleteTriviallyDeadInstructions to do
the heavy lifting.

llvm-svn: 60195
 2008-11-27 23:23:35 +00:00
Chris Lattner
53ebef9cbb enhance RecursivelyDeleteTriviallyDeadInstructions to make 
PHIs dead if they are single-value.

llvm-svn: 60194
 2008-11-27 23:18:11 +00:00
Chris Lattner
8b382de4e0 Enhance RecursivelyDeleteTriviallyDeadInstructions to optionally 
return a list of deleted instructions.

llvm-svn: 60193
 2008-11-27 23:14:34 +00:00
Chris Lattner
b2bd29b39b use continue to reduce indentation 
llvm-svn: 60192
 2008-11-27 23:00:20 +00:00
Chris Lattner
b374a0158a remove doConstantPropagation and dceInstruction, they are just 
wrappers around the interesting code and use an obscure iterator
abstraction that dates back many many years.

Move EraseDeadInstructions to Transforms/Utils and name it
RecursivelyDeleteTriviallyDeadInstructions.

llvm-svn: 60191
 2008-11-27 22:57:53 +00:00
Chris Lattner
740eb92968 simplify code. 
llvm-svn: 60190
 2008-11-27 22:56:14 +00:00
Chris Lattner
d3f7621acd simplify this logic. 
llvm-svn: 60189
 2008-11-27 22:46:09 +00:00
Nick Lewycky
f5d5d6026f Also update the README. 
llvm-svn: 60188
 2008-11-27 22:41:45 +00:00
Nick Lewycky
40db216722 Chris prefers icmp/select over udiv! 
llvm-svn: 60187
 2008-11-27 22:41:10 +00:00
Nick Lewycky
0064d6236e Add a synthetic missed optimization. 
llvm-svn: 60186
 2008-11-27 22:12:22 +00:00
Nick Lewycky
882443585d Add a couple of missed optimizations on integer vectors. Multiply and divide 
by 1, as well as multiply by -1.

llvm-svn: 60182
 2008-11-27 20:21:08 +00:00
Chris Lattner
8c052366b3 defensive patch: if CGP is merging a block with the entry block, make sure 
it ends up being the entry block.

llvm-svn: 60180
 2008-11-27 19:29:14 +00:00
Chris Lattner
73b251b3bf Fix PR3138: if we merge the entry block into another block, make sure to 
move the other block back up into the entry position!

llvm-svn: 60179
 2008-11-27 19:25:19 +00:00
Nick Lewycky
847a671436 Silence a warning. 
Despite changing the order of evaluation, this doesn't actually change the
meaning of the statement.

llvm-svn: 60177
 2008-11-27 17:29:52 +00:00
Nuno Lopes
1e97b6c181 fix build on some machines. thanks buildbot 
llvm-svn: 60175
 2008-11-27 16:42:44 +00:00
Nuno Lopes
e3f6758e3c fix my previous commit r60064: compare strings instead of pointers 
llvm-svn: 60174
 2008-11-27 16:37:02 +00:00
Chris Lattner
2959f6224e switch InstCombine::visitLoadInst to use 
FindAvailableLoadedValue

llvm-svn: 60169
 2008-11-27 08:56:30 +00:00
Chris Lattner
dd755c74d6 improve const correctness. 
llvm-svn: 60168
 2008-11-27 08:39:18 +00:00
Chris Lattner
0bd942ecb5 enhance FindAvailableLoadedValue to make use of AliasAnalysis 
if it has it.

llvm-svn: 60167
 2008-11-27 08:18:12 +00:00
Chris Lattner
577096bcaa move FindAvailableLoadedValue from JumpThreading to Transforms/Utils. 
llvm-svn: 60166
 2008-11-27 08:10:05 +00:00
Bill Wendling
cbebccf936 Get rid of bogus "control may reach end of non-void function ‘...’ being 
inlined" message.

llvm-svn: 60165
 2008-11-27 08:00:12 +00:00
Chris Lattner
cab07ddaeb simplify this code a bit. 
llvm-svn: 60164
 2008-11-27 07:54:38 +00:00
Chris Lattner
e1ed3a2962 Use the new MergeBasicBlockIntoOnlyPred function. 
llvm-svn: 60163
 2008-11-27 07:54:12 +00:00
Chris Lattner
bb86dff3fe move MergeBasicBlockIntoOnlyPred to Transforms/Utils. 
llvm-svn: 60162
 2008-11-27 07:43:12 +00:00
Bill Wendling
7742719284 XFAil test due to reverting of patch. 
llvm-svn: 60161
 2008-11-27 07:34:10 +00:00
Chris Lattner
98f62336b7 rename ThreadBlock to ProcessBlock, since it does other things than 
just simple threading.

llvm-svn: 60157
 2008-11-27 07:20:04 +00:00
Bill Wendling
4a6eedb51d Comment out code that isn't entirely correct. 
llvm-svn: 60156
 2008-11-27 07:18:35 +00:00
Misha Brukman
54dad5f940 Fixed HTML closing tag, cleaned up some spacing. 
llvm-svn: 60153
 2008-11-27 06:41:20 +00:00
Sanjiv Gupta
0638ca3697 Removing redundant semicolons. No functionality change. 
llvm-svn: 60149
 2008-11-27 05:58:04 +00:00
Chris Lattner
532458b89f Make jump threading substantially more powerful, in the following ways: 
1. Make it fold blocks separated by an unconditional branch.  This enables
   jump threading to see a broader scope.
2. Make jump threading able to eliminate locally redundant loads when they
   feed the branch condition of a block.  This frequently occurs due to
   reg2mem running.
3. Make jump threading able to eliminate *partially redundant* loads when
   they feed the branch condition of a block.  This is common in code with
   lots of loads and stores like C++ code and 255.vortex.

This implements thread-loads.ll and rdar://6402033.

Per the fixme's, several pieces of this should be moved into Transforms/Utils.

llvm-svn: 60148
 2008-11-27 05:07:53 +00:00
Evan Cheng
7db1955286 Eliminate a compile time warning. 
llvm-svn: 60145
 2008-11-27 02:29:25 +00:00
Evan Cheng
ee5e950c25 Avoid inserting noop's in the middle of a loop. 
llvm-svn: 60141
 2008-11-27 01:16:00 +00:00
Evan Cheng
f18016728c On x86 favors folding short immediate into some arithmetic operations (e.g. add, and, xor, etc.) because materializing an immediate in a register is expensive in turns of code size. 
e.g.
movl 4(%esp), %eax
addl $4, %eax

is 2 bytes shorter than

movl $4, %eax
addl 4(%esp), %eax

llvm-svn: 60139
 2008-11-27 00:49:46 +00:00
Dale Johannesen
0d6dd4bdb9 Add a missing case in visitADD. 
llvm-svn: 60137
 2008-11-27 00:43:21 +00:00
Evan Cheng
4da44412cf Add -march=x86. 
llvm-svn: 60135
 2008-11-27 00:37:06 +00:00
Ted Kremenek
d0f8118dc1 Add typedef to StringMapEntry. 
llvm-svn: 60134
 2008-11-27 00:17:25 +00:00
Mikhail Glushenkov
869ded12c8 Disallow multiple edges. 
llvm-svn: 60127
 2008-11-26 22:59:45 +00:00
Bill Wendling
3376836463 Add x86-specific test for add-with-overflow intrinsics. 
llvm-svn: 60125
 2008-11-26 22:42:19 +00:00
Bill Wendling
c60a07dbf2 Generate something sensible for an [SU]ADDO op when the overflow/carry flag is 
the conditional for the BRCOND statement. For instance, it will generate:

    addl %eax, %ecx
    jo LOF

instead of

    addl %eax, %ecx
    ; About 10 instructions to compare the signs of LHS, RHS, and sum.
    jl LOF

llvm-svn: 60123
 2008-11-26 22:37:40 +00:00
Chris Lattner
d01522d33a Turn on my codegen prepare heuristic by default. It doesn't affect 
performance in most cases on the Grawp tester, but does speed some 
things up (like shootout/hash by 15%).  This also doesn't impact 
compile time in a noticable way on the Grawp tester.

It also, of course, gets the testcase it was designed for right :)

llvm-svn: 60120
 2008-11-26 22:16:44 +00:00
Bill Wendling
d8a4b1ec05 Small formatting change. 
llvm-svn: 60113
 2008-11-26 19:19:05 +00:00
Bill Wendling
cdc91a5f09 Update to explain how ssp and sspreq attributes override each other. 
llvm-svn: 60112
 2008-11-26 19:07:40 +00:00
Devang Patel
02a25292de Fix typo. 
llvm-svn: 60111
 2008-11-26 18:13:11 +00:00
Evan Cheng
c18e38d19f Cosmetic. 
llvm-svn: 60110
 2008-11-26 18:00:00 +00:00
Duncan Sands
f64dd4b09c Check that running the DAG combiner between type 
and operation legalization does something useful.

llvm-svn: 60108
 2008-11-26 16:44:30 +00:00
Mikhail Glushenkov
1381c387d4 Describe some more options in the man page. 
llvm-svn: 60105
 2008-11-26 13:40:08 +00:00
Sanjiv Gupta
91da4472f4 Allow custom lowering of ADDE/ADDC/SUBE/SUBC operations. 
llvm-svn: 60102
 2008-11-26 11:19:00 +00:00
Mikhail Glushenkov
01a62b9117 Fix the -I option (llvmc -I dir1 -I dir2 didn't work). 
llvm-svn: 60101
 2008-11-26 10:57:31 +00:00