From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 18 Oct 2011 21:55:58 +0000 (+0000)
Subject: The immediate may be too large for the CMP instruction. Move it into a register
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=b9fecf4e077cfd54884ce96ef6bd9febf0d84191;hp=2933e4b2e65a5c5ae9958d4550cd47db793b9e54;p=oota-llvm.git

The immediate may be too large for the CMP instruction. Move it into a register
and use that in the CMP.
<rdar://problem/10305266>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142429 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index ac194145e0f..a524ddc2e3d 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -5760,29 +5760,34 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
                    .addFrameIndex(FI)
                    .addImm(4)
                    .addMemOperand(FIMMOLd));
-    AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2CMPri))
-                   .addReg(NewVReg1)
+
+    unsigned NewVReg2 = MRI->createVirtualRegister(TRC);
+    AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVi16), NewVReg2)
                    .addImm(LPadList.size()));
+
+    AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2CMPrr))
+                   .addReg(NewVReg1)
+                   .addReg(NewVReg2));
     BuildMI(DispatchBB, dl, TII->get(ARM::t2Bcc))
       .addMBB(TrapBB)
       .addImm(ARMCC::HI)
       .addReg(ARM::CPSR);
 
-    unsigned NewVReg2 = MRI->createVirtualRegister(TRC);
-    AddDefaultPred(BuildMI(DispContBB, dl, TII->get(ARM::t2LEApcrelJT),NewVReg2)
+    unsigned NewVReg3 = MRI->createVirtualRegister(TRC);
+    AddDefaultPred(BuildMI(DispContBB, dl, TII->get(ARM::t2LEApcrelJT),NewVReg3)
                    .addJumpTableIndex(MJTI)
                    .addImm(UId));
 
-    unsigned NewVReg3 = MRI->createVirtualRegister(TRC);
+    unsigned NewVReg4 = MRI->createVirtualRegister(TRC);
     AddDefaultCC(
       AddDefaultPred(
-        BuildMI(DispContBB, dl, TII->get(ARM::t2ADDrs), NewVReg3)
-        .addReg(NewVReg2, RegState::Kill)
+        BuildMI(DispContBB, dl, TII->get(ARM::t2ADDrs), NewVReg4)
+        .addReg(NewVReg3, RegState::Kill)
         .addReg(NewVReg1)
         .addImm(ARM_AM::getSORegOpc(ARM_AM::lsl, 2))));
 
     BuildMI(DispContBB, dl, TII->get(ARM::t2BR_JT))
-      .addReg(NewVReg3, RegState::Kill)
+      .addReg(NewVReg4, RegState::Kill)
       .addReg(NewVReg1)
       .addJumpTableIndex(MJTI)
       .addImm(UId);