From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 18 Oct 2011 23:19:55 +0000 (+0000)
Subject: Emit the MOVT instruction only if the # LPads is > 64K.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=15a1a226be46dfaaa15c537daa9722b6216a981d;p=oota-llvm.git

Emit the MOVT instruction only if the # LPads is > 64K.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142460 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 9cc1d335f2d..90c8f9c4426 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -5769,11 +5769,16 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
     } else {
       unsigned VReg1 = MRI->createVirtualRegister(TRC);
       AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVi16), VReg1)
-                     .addImm(NumLPads & 0xFF));
-      unsigned VReg2 = MRI->createVirtualRegister(TRC);
-      AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVTi16), VReg2)
-                     .addReg(VReg1)
-                     .addImm(NumLPads >> 16));
+                     .addImm(NumLPads & 0xFFFF));
+
+      unsigned VReg2 = VReg1;
+      if ((NumLPads & 0xFFFF0000) != 0) {
+        VReg2 = MRI->createVirtualRegister(TRC);
+        AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVTi16), VReg2)
+                       .addReg(VReg1)
+                       .addImm(NumLPads >> 16));
+      }
+
       AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2CMPrr))
                      .addReg(NewVReg1)
                      .addReg(VReg2));
@@ -5885,11 +5890,16 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
     } else {
       unsigned VReg1 = MRI->createVirtualRegister(TRC);
       AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVi16), VReg1)
-                     .addImm(NumLPads & 0xFF));
-      unsigned VReg2 = MRI->createVirtualRegister(TRC);
-      AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVTi16), VReg2)
-                     .addReg(VReg1)
-                     .addImm(NumLPads >> 16));
+                     .addImm(NumLPads & 0xFFFF));
+
+      unsigned VReg2 = VReg1;
+      if ((NumLPads & 0xFFFF0000) != 0) {
+        VReg2 = MRI->createVirtualRegister(TRC);
+        AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVTi16), VReg2)
+                       .addReg(VReg1)
+                       .addImm(NumLPads >> 16));
+      }
+
       AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::CMPrr))
                      .addReg(NewVReg1)
                      .addReg(VReg2));