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Author SHA1 Message Date
Chris Lattner
079236d1c9 My faith in programmers has been found to be totally misplaced. One would 
assume that if they don't intend to write to a global variable, that they
would mark it as constant.  However, there are people that don't understand
that the compiler can do nice things for them if they give it the information
it needs.

This pass looks for blatently obvious globals that are only ever read from.
Though it uses a trivially simple "alias analysis" of sorts, it is still able
to do amazing things to important benchmarks.  253.perlbmk, for example,
contains several ***GIANT*** function pointer tables that are not marked
constant and should be.  Marking them constant allows the optimizer to turn
a whole bunch of indirect calls into direct calls.  Note that only a link-time
optimizer can do this transformation, but perlbmk does have several strings
and other minor globals that can be marked constant by this pass when run
from GCCAS.

176.gcc has a ton of strings and large tables that are marked constant, both
at compile time (38 of them) and at link time (48 more).  Other benchmarks
give similar results, though it seems like big ones have disproportionally
more than small ones.

This pass is extremely quick and does good things.  I'm going to enable it
in gccas & gccld.  Not bad for 50 SLOC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11836 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-25 21:34:36 +00:00
Chris Lattner
940ff563f7 Fix incorrect debug code 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11821 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-25 15:15:04 +00:00
Chris Lattner
d38f208cd9 Fix a faulty optimization on FP values 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11801 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-24 18:10:14 +00:00
Chris Lattner
8e509dd5e8 If a block is made dead, make sure to promptly remove it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11799 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-24 16:09:21 +00:00
Chris Lattner
d52c261cf8 Implement SimplifyCFG/switch_switch_fold.ll 
This case occurs many times in various benchmarks, especially when combined
with the previous patch.  This allows it to get stuff like:
  if (X == 4 || X == 3)
    if (X == 5 || X == 8)

and

switch (X) {
case 4: case 5: case 6:
  if (X == 4 || X == 5)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11797 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-24 07:23:58 +00:00
Chris Lattner
e14ea0804a Rearrange code a bit 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11793 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-24 05:54:22 +00:00
Chris Lattner
0d56008f53 Implement: test/Regression/Transforms/SimplifyCFG/switch_create.ll 
This turns code like this:
  if (X == 4 | X == 7)
and
  if (X != 4 & X != 7)
into switch instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11792 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-24 05:38:11 +00:00
Chris Lattner
d8864ce766 Generate much more efficient code in programs like pifft 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11775 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 21:46:58 +00:00
Chris Lattner
077a373791 Fix a small typeo in my checkin last night that broke vortex and other programs :( 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11774 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 21:46:42 +00:00
Chris Lattner
8adac75298 Fix InstCombine/2004-02-23-ShiftShiftOverflow.ll 
Also, turn 'shr int %X, 1234' into 'shr int %X, 31'


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11768 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 20:30:06 +00:00
Chris Lattner
c5943fb186 Implement cast.ll::test14/15 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11742 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 07:16:20 +00:00
Chris Lattner
4cb170cc6e Refactor some code. In the mul - setcc folding case, we really care about 
whether this is the sign bit or not, so check unsigned comparisons as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11740 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 06:38:22 +00:00
Chris Lattner
fed58fd72e Implement mul.ll:test11 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11737 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 06:00:11 +00:00
Chris Lattner
45aaafef49 Implement "strength reduction" of X <= C and X >= C 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11735 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 05:47:48 +00:00
Chris Lattner
fb54b2b744 Implement InstCombine/mul.ll:test10, which is a case that occurs when dealing 
with "predication"


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11734 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-23 05:39:21 +00:00
Chris Lattner
c6bd195336 Implement Transforms/InstCombine/cast.ll:test13, a case which occurs in a 
hot 164.gzip loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11702 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-22 05:25:17 +00:00
Chris Lattner
57cb9883aa Fix PR245: Linking weak and strong global variables is dependent on link order 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11565 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-17 21:56:04 +00:00
Chris Lattner
19831ec853 Implement test/Regression/Transforms/SimplifyCFG/UncondBranchToReturn.ll, 
see the testcase for the reasoning.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11496 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-16 06:35:48 +00:00
Chris Lattner
7059f2e76b Fold PHI nodes of constants which are only used by a single cast. This implements 
phi.ll:test4


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11494 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-16 05:07:08 +00:00
Chris Lattner
26ca7e145e Teach LLVM to unravel the "swap idiom". This implements: 
Regression/Transforms/InstCombine/xor.ll:test20


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11492 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-16 03:54:20 +00:00
Chris Lattner
c317d39887 Implement Transforms/InstCombine/xor.ll:test19 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11490 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-16 01:20:27 +00:00
Chris Lattner
860a16143c Instead of producing calls to setjmp/longjmp, produce uses of the 
llvm.setjmp/llvm.longjmp intrinsics.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11482 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-15 22:24:27 +00:00
Chris Lattner
de512b5b2e Adjustments to support the new ConstantAggregateZero class 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11474 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-15 05:55:15 +00:00
Chris Lattner
04d1fb6df9 Remove dependence on return type of ConstantStruct::get 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11466 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-15 04:07:32 +00:00
Chris Lattner
371064481a Remove dependence on the return type of ConstantArray::get 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11463 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-15 04:05:58 +00:00
Chris Lattner
494b6920b0 Fix compilation of 126.gcc: intrinsic functions cannot throw, so they are not 
allowed in invoke instructions.  Thus, if we are inlining a call to an intrinsic
function into an invoke site, we don't need to turn the call into an invoke!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11384 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-13 16:47:35 +00:00
Chris Lattner
0db085baec Intrinsic functions cannot throw 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11383 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-13 16:46:46 +00:00
Chris Lattner
cefc18e7d9 Expose a pass ID that can be 'required' 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11376 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-13 16:16:16 +00:00
Chris Lattner
5f55aaf0f0 Remove obsolete comment. Unreachable blocks will automatically be left at the 
end of the function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11313 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-11 05:20:50 +00:00
Chris Lattner
206805e172 Add an _embarassingly simple_ implementation of basic block layout. This is 
more of a testcase for profiling information than anything that should reasonably
be used, but it's a starting point.  When I have more time I will whip this into
better shape.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11311 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-11 04:53:20 +00:00
Chris Lattner
723c66d4c0 Implement SimplifyCFG/PhiEliminate.ll 
Having a proper 'select' instruction would allow the elimination of a lot
of the special case cruft in this patch, but we don't have one yet.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11307 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-11 03:36:04 +00:00
Chris Lattner
2355f948c5 The hasConstantReferences predicate always returns false. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11301 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-11 01:17:07 +00:00
Chris Lattner
81d1a2207d initialization calls now return argc. If the program uses the argc value 
passed into main, make sure they use the return value of the init call
instead of the one passed in.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11262 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-10 17:41:01 +00:00
Chris Lattner
f1d0d3519f Only add the global variable with the abort message if an unwind actually 
occurs in the program.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11249 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-09 22:48:47 +00:00
Chris Lattner
68b86f4f41 Don't depend on auto data conversion 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11229 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-09 05:16:30 +00:00
Chris Lattner
d21cd809b6 Adjust to the changed StructType interface. In particular, getElementTypes() is gone. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11228 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-09 04:37:31 +00:00
Chris Lattner
d5d8996720 Start using the new and improve interface to FunctionType arguments 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11224 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-09 04:14:01 +00:00
Chris Lattner
99d6b8ec95 The ConstantExpr::getCast call can cause a CPR to be generated. If so, 
strip it off.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11213 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-09 00:20:55 +00:00
Misha Brukman
b9806e0101 Fix grammar-o. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11210 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 22:27:33 +00:00
Chris Lattner
501825e08a Improve compatibility with programs that already have a prototype for 'write', 
even if it is wierd in some way.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11207 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 22:14:44 +00:00
Chris Lattner
aeb2a1d708 rename the "exceptional" destination of an invoke instruction to the 'unwind' dest 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11202 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 21:44:31 +00:00
Chris Lattner
e0def04e43 Fix PR225: [pruneeh] -pruneeh pass removes invoke instructions it shouldn't 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11200 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 21:15:59 +00:00
Chris Lattner
edb1cf0c19 splitBasicBlock "does the right thing" now, no reason to reposition it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11199 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 20:49:07 +00:00
Chris Lattner
6d78457f17 Implement proper invoke/unwind lowering. 
This fixed PR16 "[lowerinvoke] The -lowerinvoke pass does not insert calls to setjmp/longjmp"


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11195 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 19:53:56 +00:00
Chris Lattner
e1c09309f2 Add a call to 'write' right before the call to abort() in the unwind path. 
This causes the JIT, or LLC'd program to print out a nice message, explaining
WHY the program aborted.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11184 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-08 07:30:29 +00:00
Chris Lattner
99dcc1da86 Fix another dominator update bug. These bugs keep getting exposed because GCSE 
keeps finding more code motion opportunities now that the dominators are correct!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11142 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 23:20:59 +00:00
Chris Lattner
3e0b870def Fix bug updating dominators 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11140 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 22:33:26 +00:00
Chris Lattner
79fc865ccb Add debug output 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11139 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 22:33:19 +00:00
Chris Lattner
4f02fc28eb Fix PR223: Loopsimplify incorrectly updates dominator information 
The problem is that the dominator update code didn't "realize" that it's
possible for the newly inserted basic block to dominate anything.  Because
it IS possible, stuff was getting updated wrong.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11137 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 21:12:24 +00:00
Chris Lattner
a33ceaa2d4 Minor speedup, don't query ValueMap each time through the loop 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11123 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-04 21:44:26 +00:00