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

rather than bundling them together.  Rename FloatToInt
to PromoteFloat (better, if not perfect).  Reorganize
files by types rather than by operations.

llvm-svn: 52408

speaking these are not constant values. However, when a function always returns
one of its arguments, then from the point of view of each caller the return
value is constant (or at least a known value) and can be replaced.

llvm-svn: 52397

individually.

Also learn IPConstProp how returning first class aggregates work, in addition
to old style multiple return instructions.

Modify the return-constants testscase to confirm this behaviour.

llvm-svn: 52396

properly.

llvm-svn: 52390

of value info (sign/zero ext info) from one MBB to another.  This doesn't
handle much right now because of two limitations:

1) only handles zext/sext, not random bit propagation (no assert exists 
   for this)
2) doesn't handle phis.

llvm-svn: 52383

llvm-svn: 52381

Rather than avoiding to wrap ISD::DECLARE GV operand in X86ISD::Wrapper, simply handle it at dagisel time with x86 specific isel code.

llvm-svn: 52377

llvm-svn: 52374

llvm-svn: 52373

when changing the stride of a comparison so that it's slightly
more precise, by having it scan the instruction list to determine
if there is a use of the condition after the point where the
condition will be inserted.

llvm-svn: 52371

this speeds up the linking testcase in PR1860 by 44% (.379 -> 0.263)

llvm-svn: 52365

llvm-svn: 52364

llvm-svn: 52363

llvm-svn: 52361

a vector with a linear search.  This speeds up the linking testcase 
in PR1860 from 0.965s to 0.385s on my system.

llvm-svn: 52357

llvm-svn: 52352

llvm-svn: 52351

llvm-svn: 52350

the testcases in PR1860 from taking more than 1 hour (when I killed it)
to taking 1s.

llvm-svn: 52347