simplifylibcalls optimization is thus valid for C++ but not C.
It's not important enough to worry about for C++ apps, so just
remove it.

rdar://7191924

llvm-svn: 80887

llvm-svn: 80871

re-commit r66920 (which has been backed out in r66953) I may have more luck this time. I'll back out if needed...

llvm-svn: 80858

the instruction BBI points to.

llvm-svn: 80768

llvm-svn: 80767

llvm-svn: 80766

return a vector of i1, not i1 itself.

llvm-svn: 80761

don't alias.  Remove an old and poorly reduced testcase that fails
with this transform for reasons unrelated to the original test.

llvm-svn: 80693

llvm-svn: 80682

from runOnFunction

llvm-svn: 80562

instcombine is changing stuff.

llvm-svn: 80538

changes: SimplifyDemandedBits can't use the builder yet because it
has the wrong insertion point.  This fixes a crash building
MultiSource/Benchmarks/PAQ8p

llvm-svn: 80537

is itself a bitcast.  Since we have gep(bitcast(bitcast(y))) in this
case, just wait for the two bitcasts to get zapped.  This prevents
instcombine from confusing some aliasing stuff, and allows it to
directly eliminate the load in the testcase.

llvm-svn: 80508

llvm-svn: 80507

in a few scalar xforms to simplify things.

llvm-svn: 80506

llvm-svn: 80505

llvm-svn: 80504

the new Instcombine builder.

llvm-svn: 80501

llvm-svn: 80500

workslist and is set to insert new instructions before the current one.
Convert a bunch of stuff that used to call InsertNewInstBefore over to
use it, greatly simplifying code and making it more natural.

There is still a lot more to go, but this is a good start.

llvm-svn: 80492

if the operand is not an instruction.

Simplify most uses of AddOperandsToWorkList to use AddValue and
inline it into the one remaining callsite.

llvm-svn: 80488

argument stronger typed.

llvm-svn: 80487

former looks too much like AddUsersToWorkList and keeps
confusing me.

Remove AddSoonDeadInstToWorklist and change its two callers
to do the same thing in a simpler way.

llvm-svn: 80486

into their callers.  simplify ReplaceInstUsesWith.  Make
EraseInstFromFunction only add operands to the worklist if
there aren't too many of them (this was a scalability win
for crazy programs that was only infrequently enforced).
Switch more code to using EraseInstFromFunction instead of
duplicating it inline.  Change some fcmp/icmp optimizations
to modify fcmp/icmp in place instead of creating a new one
and deleting the old one just to change the predicate.

llvm-svn: 80483

llvm-svn: 80482

llvm-svn: 80481

other places.

llvm-svn: 80478

llvm-svn: 80477

llvm-svn: 80476

does constant folding of gep's: this is already handled in
a more general way.

No functionality change.

llvm-svn: 80475

llvm-svn: 80454

llvm-svn: 80327

llvm-svn: 80170

llvm-svn: 80058

constructors.

llvm-svn: 80049

and introduce a new Instruction::isIdenticalTo which tests for full
identity, including the SubclassOptionalData flags. Also, fix the
Instruction::clone implementations to preserve the SubclassOptionalData
flags. Finally, teach several optimizations how to handle
SubclassOptionalData correctly, given these changes.

This fixes the counterintuitive behavior of isIdenticalTo not comparing
the full value, and clone not returning an identical clone, as well as
some subtle bugs that could be caused by these.

Thanks to Nick Lewycky for reporting this, and for an initial patch!

llvm-svn: 80038

sinking code, since they are special. If the loop preheader happens
to be the entry block of a function, don't sink static allocas
out of it. This fixes PR4775.

llvm-svn: 80010

llvm-svn: 79852

llvm-svn: 79834

llvm-svn: 79832