llvm-svn: 52487

shuffle could be skipped.  The check is invalid because the loop index i 
doesn't correspond to the element actually inserted. The correct check is
already done a few lines earlier, for whether the element is already in 
the right spot, so this shouldn't have any effect on the codegen for 
code that was already correct.

llvm-svn: 52486

llvm-svn: 52485

llvm-svn: 52480

llvm-svn: 52479

llvm-svn: 52478

llvm-svn: 52477

add new instructions.

llvm-svn: 52475

llvm-svn: 52472

Add local PRE to GVN.  This only operates in cases where it would not increase code size, namely when the instantiated expression
would only need to be created in one predecessor.

llvm-svn: 52471

According to DWARF-2 specification, the line information is provided through an offset in the .debug_line section.
Replace the label reference that is used with a section offset.

llvm-svn: 52468

llvm-svn: 52466

Revert r52459, which was causing an infinite loop or massive slowdown on MultiSource/Applications/SPASS, and possibly others as well.
Please reapply once this is fixed.

llvm-svn: 52465

llvm-svn: 52464

function, and make use of it in several places.

llvm-svn: 52463

dependencies between return values and/or arguments. Also make the handling of
arguments and return values the same.

The pass now looks properly inside returned structs, but only at the first                                                                                     
level (ie, not inside nested structs).

Also add a testcase for testing various variations of (multiple) dead rerturn
values.

llvm-svn: 52459

time. Sorry for the trouble!

This time, also add a testcase, which I should have done in the first place...

llvm-svn: 52455

llvm-svn: 52454

commit after this).

llvm-svn: 52453

llvm-svn: 52452

llvm-svn: 52450

llvm-svn: 52442

implements rdar://6013816 and the testcase in Transforms/InstCombine/sext-misc.ll.

llvm-svn: 52440

llvm-svn: 52439

llvm-svn: 52438

isn't actually called yet.

llvm-svn: 52435

llvm-svn: 52434

We don't want to find dependencies within the same block in this case.  It leads to incorrect results because
we're detecting something at or after the call we're querying on.

llvm-svn: 52433

index value.

llvm-svn: 52432

llvm-svn: 52431

llvm-svn: 52430

llvm-svn: 52425

such as those created by clone(), to a basic block.

llvm-svn: 52424

It's not safe to remove SUBREG_TO_REG that looks like identity copies, e.g. movl %eax, %eax on x86-64 actually does a zero-extend.

llvm-svn: 52421

llvm-svn: 52420

llvm-svn: 52419

Patch by Gary Benson!

llvm-svn: 52418

llvm-svn: 52415

llvm-svn: 52414

Spotted by Nick Lewycky.

llvm-svn: 52411