a bug in DSE).
* Delete dead operand uses iteratively instead of recursively, using a
  SetVector.
* Defer deletion of dead operand uses until the end of processing, which means
  we don't have to bother with updating the AliasSetTracker.  This speeds up
  DSE substantially.

llvm-svn: 15204

llvm-svn: 15199

llvm-svn: 15162

can be improved in many ways.  But: stop laughing, even with -basicaa it
deletes 15% of the stores in 252.eon :)

llvm-svn: 15101

to the field being updated.  Patch contributed by Tobias Nurmiranta

llvm-svn: 15097

llvm-svn: 15089

* Test for whether bits are shifted out during the optzn.

If so, the fold is illegal, though it can be handled explicitly for setne/seteq

This fixes the miscompilation of 254.gap last night, which was a latent bug
exposed by other optimizer improvements.

llvm-svn: 15085

"simplify" a bit of code for comparison/and folding

llvm-svn: 15082

the appopriate size.  This gives us the ability to eliminate int -> ptr -> int

llvm-svn: 15063

return, clone the 'ret' BB code into the block AFTER the inlined call, not the
other way around.

llvm-svn: 15030

llvm-svn: 15029

to constify 14 globals instead of 4 in a trivial C++ testcase.

llvm-svn: 15027

llvm-svn: 15024

llvm-svn: 15022

actually care about.  Someday when the cast instruction is gone, we can do
better here, but this will do for now.  This implements
instcombine/cast.ll:test17/18 as well.

llvm-svn: 15018

llvm-svn: 14974

night compiling cfrac.  It did not realize that code like this:

int G; int *H = &G;

takes the address of G.

llvm-svn: 14973

llvm-svn: 14972

llvm-svn: 14968

llvm-svn: 14967

llvm-svn: 14966

llvm-svn: 14965

too.

llvm-svn: 14964

llvm-svn: 14963

llvm-svn: 14958

llvm-svn: 14957

- Replace ConstantPointerRef usage with GlobalValue usage

llvm-svn: 14953

- Replace ConstantPointerRef usage with GlobalValue usage
- Minimize redundant isa<GlobalValue> usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14950

- Minimize redundant isa<GlobalValue> usage

llvm-svn: 14948

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14947

- Minimize redundant isa<GlobalValue> usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14946

- Replace ConstantPointerRef usage with GlobalValue usage
- Rename methods to get ride of ConstantPointerRef usage

llvm-svn: 14945

- Excise dead CPR procesing.

llvm-svn: 14944

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct test ordering for GlobalValue subclass

llvm-svn: 14943

Speed up SCCP substantially by processing overdefined values quickly.  This
patch speeds up SCCP by about 30-40% on large testcases.

llvm-svn: 14861

This version takes about 1s longer than the previous one (down to 2.35s),
but on the positive side, it actually works :)

llvm-svn: 14856

llvm-svn: 14853

This eliminates an N*N*logN algorithm from the loop simplify pass, replacing
it with a much simpler and faster alternative.  In a debug build, this reduces
gccas time on eon from 85s to 42s.

llvm-svn: 14851

llvm-svn: 14840

llvm-svn: 14839