[GISel]: Add support for CSEing continuously during GISel passes.

https://reviews.llvm.org/D52803

This patch adds support to continuously CSE instructions during
each of the GISel passes. It consists of a GISelCSEInfo analysis pass
that can be used by the CSEMIRBuilder.

llvm-svn: 351283

1 files changed, 7 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 34b466a41d2..b3fc94cdec6 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -31,16 +31,18 @@ using namespace llvm;
 using namespace LegalizeActions;
 
 LegalizerHelper::LegalizerHelper(MachineFunction &MF,
-                                 GISelChangeObserver &Observer)
-    : MRI(MF.getRegInfo()), LI(*MF.getSubtarget().getLegalizerInfo()),
-      Observer(Observer) {
+                                 GISelChangeObserver &Observer,
+                                 MachineIRBuilder &Builder)
+    : MIRBuilder(Builder), MRI(MF.getRegInfo()),
+      LI(*MF.getSubtarget().getLegalizerInfo()), Observer(Observer) {
   MIRBuilder.setMF(MF);
   MIRBuilder.setChangeObserver(Observer);
 }
 
 LegalizerHelper::LegalizerHelper(MachineFunction &MF, const LegalizerInfo &LI,
-                                 GISelChangeObserver &Observer)
-    : MRI(MF.getRegInfo()), LI(LI), Observer(Observer) {
+                                 GISelChangeObserver &Observer,
+                                 MachineIRBuilder &B)
+    : MIRBuilder(B), MRI(MF.getRegInfo()), LI(LI), Observer(Observer) {
   MIRBuilder.setMF(MF);
   MIRBuilder.setChangeObserver(Observer);
 }