Switch the SCEV expander and LoopStrengthReduce to use

TargetTransformInfo rather than TargetLowering, removing one of the
primary instances of the layering violation of Transforms depending
directly on Target.

This is a really big deal because LSR used to be a "special" pass that
could only be tested fully using llc and by looking at the full output
of it. It also couldn't run with any other loop passes because it had to
be created by the backend. No longer is this true. LSR is now just
a normal pass and we should probably lift the creation of LSR out of
lib/CodeGen/Passes.cpp and into the PassManagerBuilder. =] I've not done
this, or updated all of the tests to use opt and a triple, because
I suspect someone more familiar with LSR would do a better job. This
change should be essentially without functional impact for normal
compilations, and only change behvaior of targetless compilations.

The conversion required changing all of the LSR code to refer to the TTI
interfaces, which fortunately are very similar to TargetLowering's
interfaces. However, it also allowed us to *always* expect to have some
implementation around. I've pushed that simplification through the pass,
and leveraged it to simplify code somewhat. It required some test
updates for one of two things: either we used to skip some checks
altogether but now we get the default "no" answer for them, or we used
to have no information about the target and now we do have some.

I've also started the process of removing AddrMode, as the TTI interface
doesn't use it any longer. In some cases this simplifies code, and in
others it adds some complexity, but I think it's not a bad tradeoff even
there. Subsequent patches will try to clean this up even further and use
other (more appropriate) abstractions.

Yet again, almost all of the formatting changes brought to you by
clang-format. =]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171735 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 13 insertions, 12 deletions

diff --git a/test/Transforms/LoopStrengthReduce/2012-07-18-LimitReassociate.ll b/test/Transforms/LoopStrengthReduce/2012-07-18-LimitReassociate.ll
index 0aa2787620..53da462716 100644
--- a/test/Transforms/LoopStrengthReduce/2012-07-18-LimitReassociate.ll
+++ b/test/Transforms/LoopStrengthReduce/2012-07-18-LimitReassociate.ll
@@ -5,16 +5,17 @@
 ; PR13361: LSR + SCEV "hangs" on reasonably sized test with sequence of loops
 ;
 ; Without limits on CollectSubexpr, we have thousands of formulae for
-; the use that crosses loops. With limits we have five.
+; the use that crosses loops. With limits we have six.
 ; CHECK: LSR on loop %bb221:
 ; CHECK: After generating reuse formulae:
 ; CHECK: LSR is examining the following uses:
 ; CHECK: LSR Use: Kind=Special
-; CHECK: {{.*reg\(\{\{\{\{\{\{\{\{\{}}
-; CHECK: {{.*reg\(\{\{\{\{\{\{\{\{\{}}
-; CHECK: {{.*reg\(\{\{\{\{\{\{\{\{\{}}
-; CHECK: {{.*reg\(\{\{\{\{\{\{\{\{\{}}
-; CHECK: {{.*reg\(\{\{\{\{\{\{\{\{\{}}
+; CHECK: {{.*reg\(\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{}}
+; CHECK: {{.*reg\(\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{}}
+; CHECK: {{.*reg\(\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{}}
+; CHECK: {{.*reg\(\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{}}
+; CHECK: {{.*reg\(\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{}}
+; CHECK: {{.*reg\(\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{}}
 ; CHECK-NOT:reg
 ; CHECK: Filtering for use
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
diff --git a/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll b/test/Transforms/LoopStrengthReduce/X86/2008-08-14-ShadowIV.ll
index c650d8cf76..9a7f4865c5 100644
--- a/test/Transforms/LoopStrengthReduce/2008-08-14-ShadowIV.ll
+++ b/test/Transforms/LoopStrengthReduce/X86/2008-08-14-ShadowIV.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -loop-reduce -S | grep "phi double" | count 1
+; RUN: opt < %s -loop-reduce -S -mtriple=x86_64-unknown-unknown | grep "phi double" | count 1
 
 define void @foobar(i32 %n) nounwind {
 entry:
diff --git a/test/Transforms/LoopStrengthReduce/2011-07-20-DoubleIV.ll b/test/Transforms/LoopStrengthReduce/X86/2011-07-20-DoubleIV.ll
index 5d9ed64ef4..a932b47925 100644
--- a/test/Transforms/LoopStrengthReduce/2011-07-20-DoubleIV.ll
+++ b/test/Transforms/LoopStrengthReduce/X86/2011-07-20-DoubleIV.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -loop-reduce -S | FileCheck %s
+; RUN: opt < %s -loop-reduce -S -mtriple=x86_64-unknown-unknown | FileCheck %s
 ;
 ; Test LSR's OptimizeShadowIV. Handle a floating-point IV with a
 ; nonzero initial value.
diff --git a/test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll b/test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll
index 96904c66e6..9e02d92a6f 100644
--- a/test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll
+++ b/test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll
@@ -4,12 +4,12 @@
 ; LSR should properly handle the post-inc offset when folding the
 ; non-IV operand of an icmp into the IV.
 
-; CHECK:   %4 = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
-; CHECK:   %5 = lshr i64 %4, 1
-; CHECK:   %6 = mul i64 %5, 2
+; CHECK:   %3 = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
+; CHECK:   %4 = lshr i64 %3, 1
+; CHECK:   %5 = mul i64 %4, 2
 ; CHECK:   br label %for.body
 ; CHECK: for.body:
-; CHECK:   %lsr.iv2 = phi i64 [ %lsr.iv.next, %for.body ], [ %6, %for.body.lr.ph ]
+; CHECK:   %lsr.iv2 = phi i64 [ %lsr.iv.next, %for.body ], [ %5, %for.body.lr.ph ]
 ; CHECK:   %lsr.iv.next = add i64 %lsr.iv2, -2
 ; CHECK:   %lsr.iv.next3 = inttoptr i64 %lsr.iv.next to i16*
 ; CHECK:   %cmp27 = icmp eq i16* %lsr.iv.next3, null