From ec9eef4a15157fc0a05feff933848aa9283bd1af Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Mon, 28 Sep 2009 22:08:06 +0000
Subject: [PATCH] Adjust processFunctionBeforeCalleeSavedScan() to correctly
 reserve a stack slot for the register scavenger when compiling Thumb1
 functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83023 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMBaseRegisterInfo.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index ab3dcd6992c..9b923093923 100644
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -536,7 +536,8 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
       }
     }
 
-    if (CSRegClasses[i] == ARM::GPRRegisterClass) {
+    if (CSRegClasses[i] == ARM::GPRRegisterClass ||
+        CSRegClasses[i] == ARM::tGPRRegisterClass) {
       if (Spilled) {
         NumGPRSpills++;
 
@@ -667,7 +668,8 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
             NumExtras--;
           }
         }
-        while (NumExtras && !UnspilledCS2GPRs.empty()) {
+        while (NumExtras && !UnspilledCS2GPRs.empty() &&
+               !AFI->isThumb1OnlyFunction()) {
           unsigned Reg = UnspilledCS2GPRs.back();
           UnspilledCS2GPRs.pop_back();
           if (!isReservedReg(MF, Reg)) {