Don't create a whole new string just to copy the elements into it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52785 91177308-0d34-0410-b5e6-96231b3b80d8

Use the -enable-pre flag so this test doesn't fail.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52784 91177308-0d34-0410-b5e6-96231b3b80d8

Make LLVM compile on DragonFly BSD (PR2499).

Patch by Hasso Tepper!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52781 91177308-0d34-0410-b5e6-96231b3b80d8

Add missing semicolumn in my last commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52780 91177308-0d34-0410-b5e6-96231b3b80d8

Improve comments wrt createInternalize.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52779 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanup for unitialized types. Patch by Jean-Daniel Dupas!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52775 91177308-0d34-0410-b5e6-96231b3b80d8

"An improved Mach-O file type detection for sys::IdentifyFileType()
This patch add supports for single architecture mach-o files (the current implementation only support Universal Binary), and solve the signature conflict between java class and Universal Binary magics.

Note that this function will always returned dynamic library for Universal Binaries (like the current implementation) because the binary type is not include in the file header."

Patch by Jean-Daniel Dupas!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52766 91177308-0d34-0410-b5e6-96231b3b80d8

Reserve the size we'll need in advance.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52763 91177308-0d34-0410-b5e6-96231b3b80d8

Allow for rounding up of stack frame.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52751 91177308-0d34-0410-b5e6-96231b3b80d8

Fixes the last x86-64 test failure in compat.exp:
<16 x float> is 64-byte aligned (for some reason),
which gets us into the stack realignment code.  The
computation changing FP-relative offsets to SP-relative
was broken, assiging a spill temp to a location
also used for parameter passing.  This
fixes it by rounding up the stack frame to a multiple
of the largest alignment (I concluded it wasn't fixable
without doing this, but I'm not very sure.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52750 91177308-0d34-0410-b5e6-96231b3b80d8

Remove unused function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52749 91177308-0d34-0410-b5e6-96231b3b80d8

Move GetConstantStringInfo to lib/Analysis. Remove
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52748 91177308-0d34-0410-b5e6-96231b3b80d8

when we know the signbit of an input to uint_to_fp is zero,
change it to sint_to_fp on targets where that is cheaper (and
visaversa of course).  This allows us to compile uint_to_fp to:

_test:
movl 4(%esp), %eax
shrl $23, %eax
cvtsi2ss %eax, %xmm0
movl 8(%esp), %eax
movss %xmm0, (%eax)
ret

instead of:

.align 3
LCPI1_0: ##  double
.long 0 ## double least significant word 4.5036e+15
.long 1127219200 ## double most significant word 4.5036e+15
.text
.align 4,0x90
.globl _test
_test:
subl $12, %esp
movl 16(%esp), %eax
shrl $23, %eax
movl %eax, (%esp)
movl $1127219200, 4(%esp)
movsd (%esp), %xmm0
subsd LCPI1_0, %xmm0
cvtsd2ss %xmm0, %xmm0
movl 20(%esp), %eax
movss %xmm0, (%eax)
addl $12, %esp
ret

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52747 91177308-0d34-0410-b5e6-96231b3b80d8

Remember which MachineOperand we were processing, so we don't have to scan the list to find it again later.
This speeds up live intervals from 0.37s to 0.30s on instcombine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52745 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the text in an assert string.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52744 91177308-0d34-0410-b5e6-96231b3b80d8

- Fix a x86 vector isel bug: illegal transformation of a vector_shuffle into a
  shift.
- Add a readme entry for a missing vector_shuffle optimization that results in
  awful codegen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52740 91177308-0d34-0410-b5e6-96231b3b80d8

Add support for expanding PPC 128 bit floats.
For this it is convenient to permit floats to
be used with EXTRACT_ELEMENT, so I tweaked
things to allow that.  I also added libcalls
for ppcf128 to i32 forms of FP_TO_XINT, since
they exist in libgcc and this case can certainly
occur (and does occur in the testsuite) - before
the i64 libcall was being used.  Also, the
XINT_TO_FP result seemed to be wrong when
the argument is an i128: the wrong fudge
factor was added (the i32 and i64 cases were
handled directly, but the i128 code fell
through to some generic softening code which
seemed to think it was i64 to f32!).  So I
fixed it by adding a fudge factor that I
found in my breakfast cereal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52739 91177308-0d34-0410-b5e6-96231b3b80d8

Implement JIT support for global aliases, patch by David Chisnall!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52738 91177308-0d34-0410-b5e6-96231b3b80d8

Restore DeadArgElim back to 52570. It's breaking 447.dealII.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52736 91177308-0d34-0410-b5e6-96231b3b80d8

Switch the PPC backend and target-independent JIT to use the libsystem
InvalidateInstructionCache method instead of calling through
a hook on the JIT.  This is a host feature, not a target feature.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52734 91177308-0d34-0410-b5e6-96231b3b80d8

fix compilation errors in my previous patch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52733 91177308-0d34-0410-b5e6-96231b3b80d8

Add a new InvalidateInstructionCache method to sys::Memory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52731 91177308-0d34-0410-b5e6-96231b3b80d8

jump threading can introduce allocas, make sure we promote
them back to registers!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52729 91177308-0d34-0410-b5e6-96231b3b80d8

run mem2reg after the second jump threading pass in llvm-ld.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52728 91177308-0d34-0410-b5e6-96231b3b80d8

remove a bunch of dead options that never did anything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52727 91177308-0d34-0410-b5e6-96231b3b80d8

remove some dead options.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52726 91177308-0d34-0410-b5e6-96231b3b80d8

SimpleInstructionSelector is here no more.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52725 91177308-0d34-0410-b5e6-96231b3b80d8

Add/complete support for integer and float
select_cc and friends.  This code could be
factorized a bit but I'm not sure that it's
worth it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52724 91177308-0d34-0410-b5e6-96231b3b80d8

Pacify gcc-4.3.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52723 91177308-0d34-0410-b5e6-96231b3b80d8

Remove the OrigVT member from AtomicSDNode, as it is redundant with
the base SDNode's VTList.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52722 91177308-0d34-0410-b5e6-96231b3b80d8

simplify shell syntax to work better on solaris, patch by
Nathan Keynes!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52721 91177308-0d34-0410-b5e6-96231b3b80d8

Added MemOperands to Atomic operations since Atomics touches memory.
Added abstract class MemSDNode for any Node that have an associated MemOperand
Changed atomic.lcs => atomic.cmp.swap, atomic.las => atomic.load.add, and
atomic.lss => atomic.load.sub

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52706 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a (false) warning on darwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52705 91177308-0d34-0410-b5e6-96231b3b80d8

Fix some cosmetics in comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52704 91177308-0d34-0410-b5e6-96231b3b80d8

- Use O(1) check of basic block size limit.
- Avoid speculatively execute vector ops.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52703 91177308-0d34-0410-b5e6-96231b3b80d8

Fix PR2488, a case where we deleted stack restores too aggressively.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52702 91177308-0d34-0410-b5e6-96231b3b80d8

Enable two-address remat by default.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52701 91177308-0d34-0410-b5e6-96231b3b80d8

Use push_back rather than operator[], which is incorrect in this cases. Unfortunately, this slow the testcase down a little bit,
but only marginally.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52700 91177308-0d34-0410-b5e6-96231b3b80d8

Use present tense when talking about User layout. It is implemented now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52699 91177308-0d34-0410-b5e6-96231b3b80d8

Append to the ActiveTimers std::vector before looking at the timer instead
of after, so that any reallocation it does doesn't get counted for the pass
being timed.  This probably doesn't account for a timing discrepancy I was
looking into, but I'm fixing it anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52693 91177308-0d34-0410-b5e6-96231b3b80d8

v2f32 is now a valid (MMX) type which breaks this
test (doesn't work for any MMX vector types, it's
not me).  Rewritten to use v2i16 which is generic
and going to stay that way; I think that preserves
the point of the test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52692 91177308-0d34-0410-b5e6-96231b3b80d8

Add v2f32 (MMX) type to X86.  Support is primitive:
load,store,call,return,bitcast.  This is enough to
make call and return work.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52691 91177308-0d34-0410-b5e6-96231b3b80d8

In ConstantArray::getAsString(), we know the size of the resultant string in advance so we can pre-allocate it and just fill in
the entries.  This improves the time for the AsmPrinter on InstructionCombining.cpp from 0.4248s to 0.3370s.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52690 91177308-0d34-0410-b5e6-96231b3b80d8

Use SmallVector instead of std::vector for a minor compile time improvement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52689 91177308-0d34-0410-b5e6-96231b3b80d8

Revert 52645, the loop unroller changes. It caused a regression in 252.eon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52688 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a typo in a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52687 91177308-0d34-0410-b5e6-96231b3b80d8

Make Allocate<T>() return a T* instead of a void*. And use
static_cast instead of reinterpret_cast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52686 91177308-0d34-0410-b5e6-96231b3b80d8

Regenerate configure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52685 91177308-0d34-0410-b5e6-96231b3b80d8

Use const_cast instead of a C-style cast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52684 91177308-0d34-0410-b5e6-96231b3b80d8

Correct a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52683 91177308-0d34-0410-b5e6-96231b3b80d8

Add support for building on solaris, working around namespace
polution problems from system headers.  Patch by Nathan Keynes!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52682 91177308-0d34-0410-b5e6-96231b3b80d8

Pass std::string by reference. Thanks Chris!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52678 91177308-0d34-0410-b5e6-96231b3b80d8

Commit the new DeadArgElim pass again, this time with the gcc bootstrap failures fixed.

Also add a testcase to reproduce the gcc bootstrap failure in very much reduced form.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52677 91177308-0d34-0410-b5e6-96231b3b80d8

Allow the test suite to be checked out into projects/test-suite.

We will keep the old projects/llvm-test working for existing installs.

The changes to configure are made manually, since I lack autoconf-2.6. Someone
might want to run AutoGen.sh to see if that changes anything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52675 91177308-0d34-0410-b5e6-96231b3b80d8

Update testing documentation with more consistent terminology.

All of LLVM's testing features are now referred to as the "Testing
infrastructure", the DejaGNU tests are just that, and the whole program tests
are referred to as the "test suite".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52674 91177308-0d34-0410-b5e6-96231b3b80d8

Rename a few variables to be more consistent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52672 91177308-0d34-0410-b5e6-96231b3b80d8

If it's determined safe, remat MOV32r0 (i.e. xor r, r) and others as it is instead of using the longer MOV32ri instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52670 91177308-0d34-0410-b5e6-96231b3b80d8

Fix some signed vs. unsigned issues in array and vector handling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52664 91177308-0d34-0410-b5e6-96231b3b80d8

Add a note about a potential PIC optimization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52663 91177308-0d34-0410-b5e6-96231b3b80d8

Fixes for being compiled PIC on Linux. This isn't the most
general solution possible, but it's a fairly simple one.
Based on a patch from the OpenGTL project!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52662 91177308-0d34-0410-b5e6-96231b3b80d8

Remove an incorrect comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52660 91177308-0d34-0410-b5e6-96231b3b80d8

Use InstrSlots::NUM rather than pre-dividing by four.  Also, mark this const.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52659 91177308-0d34-0410-b5e6-96231b3b80d8

Comment fixes, and make Schedule() pure virtual.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52658 91177308-0d34-0410-b5e6-96231b3b80d8

A brief survey of priority_queue usage in the tree turned this up
as a questionable case, but the code isn't actually needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52657 91177308-0d34-0410-b5e6-96231b3b80d8

Add a clear() method to PriorityQueue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52656 91177308-0d34-0410-b5e6-96231b3b80d8

This situation can occur:

    ,------.
    |      |
    |      v
    |   t2 = phi ... t1 ...
    |      |
    |      v
    |   t1 = ...
    |  ... = ... t1 ...
    |      |
    `------'

where there is a use in a PHI node that's a predecessor to the defining
block. We don't want to mark all predecessors as having the value "alive" in
this case. Also, the assert was too restrictive and didn't handle this case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52655 91177308-0d34-0410-b5e6-96231b3b80d8

Use the new PriorityQueue in ScheduleDAGList too, which also
needs arbitrary-element removal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52654 91177308-0d34-0410-b5e6-96231b3b80d8

Add getScaledIntervalSize, which gives a measure of the size of an interval that is independent of the scaling of
the function due to empty index slots.  This is suitable for use in backend heuristics that need to reason about the density
of an interval.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52652 91177308-0d34-0410-b5e6-96231b3b80d8

Use use_empty() instead of getNumUses(), avoiding a use list traversal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52651 91177308-0d34-0410-b5e6-96231b3b80d8

Use getMBBEndIdx rather than assuming that the end is right after the last instruction in the block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52649 91177308-0d34-0410-b5e6-96231b3b80d8

Fix spelling and grammar in a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52648 91177308-0d34-0410-b5e6-96231b3b80d8

Extract the x86_64 part for the executables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52647 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify erase_one slightly. It's not necessary to preserve
the value of the element to be erased while the heap is
being updated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52646 91177308-0d34-0410-b5e6-96231b3b80d8

Revamp the loop unroller, extending it to correctly update PHI nodes
in the presence of out-of-loop users of in-loop values and the trip
count is not a known multiple of the unroll count, and to be a bit
simpler overall. This fixes PR2253.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52645 91177308-0d34-0410-b5e6-96231b3b80d8

Remove option used to debug stack coloring bugs. It's no longer needed since stack coloring is now bug free.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52644 91177308-0d34-0410-b5e6-96231b3b80d8

Disable PRE. It's breaking bootstrapping.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52643 91177308-0d34-0410-b5e6-96231b3b80d8

Move a DenseMap's declaration outside of a loop, and just call
clear() on each iteration. This avoids allocating and deallocating
all of DenseMap's memory on each iteration.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52642 91177308-0d34-0410-b5e6-96231b3b80d8

Use StringMap instead of std::map<std::string, SDNode*>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52641 91177308-0d34-0410-b5e6-96231b3b80d8

Add methods to StringMap to erase entries by key.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52640 91177308-0d34-0410-b5e6-96231b3b80d8

Instead of adding an isSS field to LiveInterval to denote stack slot. Use top bit of 'reg' instead. If the top bit is set, than the LiveInterval represents a stack slot live interval.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52639 91177308-0d34-0410-b5e6-96231b3b80d8

First step to fix PR2088. Implement routine to compute the
multiplicative inverse of a given number. Modify udivrem to allow input and
output pairs of arguments to overlap. Patch is based on the work by Chandler
Carruth.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52638 91177308-0d34-0410-b5e6-96231b3b80d8

Update the .cvs files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52637 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the types for NumElements variables, and add a comment
explaining why empty array constants use ValID::createUndef().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52636 91177308-0d34-0410-b5e6-96231b3b80d8

Tighten the conditions under which we do PRE, remove some unneeded code, and correct our preserved analyses list, since we
do now change the CFG by splitting critical edges during PRE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52631 91177308-0d34-0410-b5e6-96231b3b80d8

minor tidying of comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52630 91177308-0d34-0410-b5e6-96231b3b80d8

Remove two convenience constructors because they're now private, and the
private implementation doesn't really need the convenience.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52629 91177308-0d34-0410-b5e6-96231b3b80d8

Use std::copy instead of a loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52628 91177308-0d34-0410-b5e6-96231b3b80d8

More changes from Chris' review: simplify getIndices and avoid
copying its return value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52627 91177308-0d34-0410-b5e6-96231b3b80d8

Remove an unnecessary cast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52626 91177308-0d34-0410-b5e6-96231b3b80d8

Duncan pointed out this code could be tidied.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52624 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the syntax of insertvalue in the example.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52623 91177308-0d34-0410-b5e6-96231b3b80d8

Port some integer multiplication fixes from LegalizeDAG.
Bail out with an error if there is no libcall available
for the given size of integer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52622 91177308-0d34-0410-b5e6-96231b3b80d8

Support for expanding the result of EXTRACT_ELEMENT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52621 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanup up LegalizeTypes handling of loads and
stores.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52620 91177308-0d34-0410-b5e6-96231b3b80d8

Make test work on non-x86 machines (like my G4 PPC).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52619 91177308-0d34-0410-b5e6-96231b3b80d8

At Chris' suggestion, move the liveness and worklist datastructures into
instance variables so they can be allocated just once, and reuse the worklist
as the dead list as well.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52618 91177308-0d34-0410-b5e6-96231b3b80d8

Improve LSR's dead-phi detection to handle use-def cycles
with more than two nodes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52617 91177308-0d34-0410-b5e6-96231b3b80d8

Use Loop::block_iterator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52616 91177308-0d34-0410-b5e6-96231b3b80d8

Generalize createSCEV to be able to form SCEV expressions from
ConstantExprs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52615 91177308-0d34-0410-b5e6-96231b3b80d8

Use SCEVAddRecExpr::isAffine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52614 91177308-0d34-0410-b5e6-96231b3b80d8