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

rdar://problem/6945110

llvm-svn: 131493

llvm-svn: 129419

llvm-svn: 129403

Now that we have a first-class way to represent unaligned loads, the unaligned
load intrinsics are superfluous.

First part of <rdar://problem/8460511>.

llvm-svn: 129401

llvm-svn: 128380

normal version.

Fixes rdar://9123638

llvm-svn: 127636

This happens a lot in clang-compiled C++ code because it adds overflow checks to operator new[]:
  unsigned *foo(unsigned n) { return new unsigned[n]; }
We can optimize away the overflow check on 64 bit targets because (uint64_t)n*4 cannot overflow.

llvm-svn: 127418

function prototype into a call to a varargs prototype.  We do
allow the xform if we have a definition, but otherwise we don't
want to risk that we're changing the abi in a subtle way.  On
X86-64, for example, varargs require passing stuff in %al.

llvm-svn: 126363

intrinsics element dependencies. Reviewed by Nick.

llvm-svn: 123161

llvm-svn: 123030

This happens when we take the (non-constant) length from a malloc.

llvm-svn: 122961

InstCombine: If we call llvm.objectsize on a malloc call we can replace it with the size passed to malloc.

llvm-svn: 122959

llvm-svn: 122958

llvm-svn: 122556

llvm-svn: 122554

llvm-svn: 122238

llvm-svn: 122237

llvm-svn: 122215

llvm-svn: 122183

result is dead.  This is required for my next patch to not
regress the testsuite.

llvm-svn: 122181

llvm-svn: 117154

llvm-svn: 115296

it doesn't regress again.

llvm-svn: 110597

around std::min vs static const friction.

llvm-svn: 110112

llvm-svn: 109891

alloca instructions (constrained by their internal encoding),
and add error checking for it. Fix an instcombine bug which
generated huge alignment values (null is infinitely aligned).
This fixes undefined behavior noticed by John Regehr.

llvm-svn: 109643

dereference is theoretically infinite. Put a cap on the computed
alignment to avoid overflow, noticed by John Regehr.

llvm-svn: 109596

llvm-svn: 109092

llvm-svn: 108522

llvm-svn: 107275

llvm-svn: 107017

llvm-svn: 106824

llvm-svn: 106750

llvm-svn: 106744

llvm-svn: 106743

llvm-svn: 106740

to null.  Patch by Matti Niemenmaa.

llvm-svn: 104871

to not increase the alignment of globals with an assigned
alignment and section.

llvm-svn: 102476