llvm-svn: 122554

from stores when folding in bitcasts.

llvm-svn: 117265

Remove r111665, which implemented store-narrowing in InstCombine.  Chris discovered a miscompilation in it, and it's not easily
fixable at the optimizer level. I'll investigate reimplementing it in DAGCombine.

llvm-svn: 112575

llvm-svn: 111665

llvm-svn: 111571

When a set of bitmask operations, typically from a bitfield initialization, only modifies the low bytes of a value,
we can narrow the store to only over-write the affected bytes.

llvm-svn: 111568

instructions with alignment 0, so that subsequent passes don't
need to bother checking the TargetData ABI size manually.

llvm-svn: 110128

llvm-svn: 109103

llvm-svn: 108150

llvm-svn: 107962

lib/Transforms/Utils and into lib/Analysis so that Analysis passes
can use them.

llvm-svn: 104949

llvm-svn: 104945

and T->isPointerTy().  Convert most instances of the first form to the second form.
Requested by Chris.

llvm-svn: 96344

isInteger, we now have isFloatTy and isIntegerTy.  Requested by Chris!

llvm-svn: 96223

unconditionally.  Besides checking the offset, also check that the underlying
object is aligned as much as the load itself.

llvm-svn: 94875

llvm-svn: 94863

create a testcase where this matters.  The select+load transformation only
occurs when isSafeToLoadUnconditionally is true, and in those situations,
instcombine also changes the underlying objects to be aligned.  This seems
like a good idea regardless, and I've verified that it doesn't pessimize
the subsequent realignment.

llvm-svn: 94850

indices are safe if the result is known to be within the bounds of the
underlying object.

llvm-svn: 94829

llvm-svn: 94194

llvm-svn: 94112

llvm-svn: 93831

llvm-svn: 92685