"stored once" even if its address is compared.

llvm-svn: 131849

causing it to get into infinite loops when it would widen a 
load (which can necessarily leave around dead loads).

llvm-svn: 131847

of the inlinee to the code representing the original function.

llvm-svn: 131838

consistently.

llvm-svn: 131803

It's better to do this in codegen, mul.with.overflow(X, 2) is more canonical because it has only one use on "X".

llvm-svn: 131798

llvm-svn: 131789

No functionality enabled by default. Use -disable-iv-rewrite.
Extended IVUsers to keep track of the phi that represents the users' IV.
Added the WidenIV transform to replace a narrow IV with a wide IV
by doing a one-for-one replacement of IV users instead of expanding the
SCEV expressions. [sz]exts are removed and truncs are inserted.

llvm-svn: 131744

llvm-svn: 131716

llvm-svn: 131708

Reapply r131605. This time with a fix, which is to use NoFolder.

llvm-svn: 131673

llvm-svn: 131659

llvm-svn: 131620

I'm not sure this is quite ideal, but I can't really think of any better way to do it.

llvm-svn: 131616

llvm-svn: 131609

llvm-svn: 131607

llvm-svn: 131605

llvm-svn: 131604

llvm-svn: 131598

llvm-svn: 131596

llvm-svn: 131580

of the comparison, so that the resulting expression is fully
normalized. This fixes PR9939.

llvm-svn: 131576

llvm-svn: 131571

llvm-svn: 131566

llvm-svn: 131561

llvm-svn: 131559

llvm-svn: 131552

llvm-svn: 131551

llvm-svn: 131548

llvm-svn: 131547

llvm-svn: 131545

llvm-svn: 131544

llvm-svn: 131543

llvm-svn: 131542

llvm-svn: 131541

llvm-svn: 131538

Original log entry:
Refactor getActionType and getTypeToTransformTo ; place all of the 'decision'
code in one place.

llvm-svn: 131536

code in one place.

llvm-svn: 131534

Start trying to make InstCombine preserve more debug info.  The idea here is to set the debug location on the IRBuilder, which will be then right location in most cases.  This should magically give many transformations debug locations, and fixing places which are missing a debug location will usually just means changing the code creating it to use the IRBuilder.

As an example, the change to InstCombineCalls catches a common case where a call to a bitcast of a function is rewritten.

Chris, does this approach look reasonable?

llvm-svn: 131516

llvm-svn: 131512

llvm-svn: 131508