llvm-svn: 44981

2. Using zero-extended value of Scale and unsigned division is safe provided
   that Scale doesn't have the sign bit set.
   Previously these 2 instructions:
        %p = bitcast [100 x {i8,i8,i8}]* %x to i8*
        %q = getelementptr i8* %p, i32 -4
   were combined into:
        %q = getelementptr [100 x { i8, i8, i8 }]* %x, i32 0,
               i32 1431655764, i32 0
   what was incorrect.

llvm-svn: 44936

llvm-svn: 44905

Bug fix. Only safe to perform extension uses optimization if the source of extension is also defined in the same BB as the extension.

llvm-svn: 44896

on functions as it calculates them.

llvm-svn: 44802

Fix several cache coherence bugs in MemDep/GVN that were found.  Also add some (disabled) debugging code
to make such problems easier to diagnose in the future, written by Duncan Sands.

llvm-svn: 44695

llvm-svn: 44655

llvm-svn: 44650

If both result of the {s|z}xt and its source are live out, rewrite all uses of the source with result of extension.

llvm-svn: 44643

throw exceptions", just mark intrinsics with the nounwind
attribute.  Likewise, mark intrinsics as readnone/readonly
and get rid of special aliasing logic (which didn't use
anything more than this anyway).

llvm-svn: 44544

llvm-svn: 44543

insert new ExitValue after this operand definition.

This fixes PR1828.

llvm-svn: 44539

into alias analysis.  This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter.  These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function.  Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite.  To reduce the
chance of misuse it is now protected.

llvm-svn: 44487

llvm-svn: 44437

use them.

llvm-svn: 44403

the function type, instead they belong to functions
and function calls.  This is an updated and slightly
corrected version of Reid Spencer's original patch.
The only known problem is that auto-upgrading of
bitcode files doesn't seem to work properly (see
test/Bitcode/AutoUpgradeIntrinsics.ll).  Hopefully
a bitcode guru (who might that be? :) ) will fix it.

llvm-svn: 44359

Make LoopInfoBase more generic, in preparation for having MachineLoopInfo.  This involves a small interface change.

llvm-svn: 44348

llvm-svn: 44325

llvm-svn: 44323

llvm-svn: 44320

llvm-svn: 44318

trivial difference in function attributes, allow calls to it to
be converted to direct calls.  Based on a patch by Török Edwin.
While there, move the various lists of mutually incompatible
parameters etc out of the verifier and into ParameterAttributes.h.

llvm-svn: 44315

llvm-svn: 44293

from the old ADCE implementation (there it was
correct because the transform was being done
for read-only functions).

llvm-svn: 44287

llvm-svn: 44284

llvm-svn: 44280

exceptions, so don't turn invokes of them into
calls.

llvm-svn: 44278

llvm-svn: 44262

llvm-svn: 44234

fix an occasional nonrepeatable bootstrap failure we've
been seeing on Darwin.

llvm-svn: 44202

llvm-svn: 44188

by inserting unreachable after no-return calls.

llvm-svn: 44099

and simplifycfg in the rare cases when it is needed.

llvm-svn: 44044

llvm-svn: 43897

llvm-svn: 43893

llvm-svn: 43780

llvm-svn: 43779

all compute the same value.

llvm-svn: 43777

type of SV has changed from what it originally was.
However we need the store width of the original.

llvm-svn: 43775

llvm-svn: 43745