From 91aac1015e6714d959801dd8d60f55a72827dc4d Mon Sep 17 00:00:00 2001
From: Dale Johannesen <dalej@apple.com>
Date: Wed, 17 Sep 2008 21:13:11 +0000
Subject: Add a bit to mark operands of asm's that conflict with an
 earlyclobber operand elsewhere.  Propagate this bit and the earlyclobber bit
 through SDISel. Change linear-scan RA not to allocate regs in a way that
 conflicts with an earlyclobber.  See also comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56290 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineInstr.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'lib/CodeGen/MachineInstr.cpp')

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 7f2a7b6a07..a365f20300 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -109,6 +109,7 @@ void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
   // register's use/def lists.
   if (isRegister()) {
     assert(!isEarlyClobber());
+    assert(!isEarlyClobber() && !overlapsEarlyClobber());
     setReg(Reg);
   } else {
     // Otherwise, change this to a register and set the reg#.
@@ -128,6 +129,7 @@ void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
   IsKill = isKill;
   IsDead = isDead;
   IsEarlyClobber = false;
+  OverlapsEarlyClobber = false;
   SubReg = 0;
 }
 
@@ -183,13 +185,20 @@ void MachineOperand::print(std::ostream &OS, const TargetMachine *TM) const {
         OS << "%mreg" << getReg();
     }
       
-    if (isDef() || isKill() || isDead() || isImplicit() || isEarlyClobber()) {
+    if (isDef() || isKill() || isDead() || isImplicit() || isEarlyClobber() ||
+        overlapsEarlyClobber()) {
       OS << "<";
       bool NeedComma = false;
+      if (overlapsEarlyClobber()) {
+        NeedComma = true;
+        OS << "overlapsearly";
+      }
       if (isImplicit()) {
+        if (NeedComma) OS << ",";
         OS << (isDef() ? "imp-def" : "imp-use");
         NeedComma = true;
       } else if (isDef()) {
+        if (NeedComma) OS << ",";
         if (isEarlyClobber())
           OS << "earlyclobber,";
         OS << "def";
-- 
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