explained in the comment.

This fixes UnitTests/2003-09-18-BitFieldTest on darwin

llvm-svn: 22483

as a signed compare.  This patch may fix PR597, but is correct in any case.

llvm-svn: 22465

Because the instcombine has to scan the entire function when it starts up
to begin with, we might as well do it in DFO so we can nuke unreachable code.

This fixes: Transforms/InstCombine/2005-07-07-DeadPHILoop.ll

llvm-svn: 22348

llvm-svn: 22265

llvm-svn: 22254

GCC 4.0.0 compiler (sometimes incorrectly) warns about under release build.

llvm-svn: 22249

It is actually always true.  This fixes PR586 and
Transforms/InstCombine/2005-06-16-SetCCOrSetCCMiscompile.ll

llvm-svn: 22236

Transforms/InstCombine/2005-06-16-RangeCrash.ll

llvm-svn: 22234

llvm-svn: 22230

llvm-svn: 22227

llvm-svn: 22225

is always ubyte, get the type being shifted).  This unbreaks espresso

llvm-svn: 22224

BB iterator.  This fixes Transforms/IndVarsSimplify/2005-06-15-InstMoveCrash.ll

llvm-svn: 22221

Do not perform undefined out of range shifts.

llvm-svn: 22217

allows test programs to succeed. Actual fix for this is forthcoming.

llvm-svn: 22213

fix the bzip2 test. A better hack is needed.

llvm-svn: 22209

llvm-svn: 22206

llvm-svn: 22192

llvm-svn: 22024

instruction.  This is useful for catching optimizers that don't preserve
calling conventions

llvm-svn: 21928

fixes Ptrdist/anagram with x86 llcbeta

llvm-svn: 21925

llvm-svn: 21924

llvm-svn: 21839

suitable for tail calls.

llvm-svn: 21836

llvm-svn: 21809

llvm-svn: 21788

llvm-svn: 21786

llvm-svn: 21785

This makes reassociate realize that loads should be treated as unmovable, and
gives distinct ranks to distinct values defined in the same basic block, allowing
reassociate to do its thing.

llvm-svn: 21783

llvm-svn: 21781

llvm-svn: 21780

llvm-svn: 21778

llvm-svn: 21776

in.  This tends to get cases like this:

  X = cast ubyte to int
  Y = shr int X, ...

Tested by: shift.ll:test24

llvm-svn: 21775

llvm-svn: 21772

llvm-svn: 21771

llvm-svn: 21770

of trying to do local reassociation tweaks at each level, only process an expression
tree once (at its root).  This does not improve the reassociation pass in any real way.

llvm-svn: 21768

Reassociate/shifttest.ll

llvm-svn: 21761

llvm-svn: 21759