From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 11 Mar 2008 07:16:00 +0000 (+0000)
Subject: In 32-bit mode, mark 64-bit GPR's as unallocatable.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=204496d58e7e740f0da6d41c6214a91d67950d26;p=oota-llvm.git

In 32-bit mode, mark 64-bit GPR's as unallocatable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48217 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86RegisterInfo.td b/lib/Target/X86/X86RegisterInfo.td
index 93d2a510fbc..24402386c8e 100644
--- a/lib/Target/X86/X86RegisterInfo.td
+++ b/lib/Target/X86/X86RegisterInfo.td
@@ -415,6 +415,9 @@ def GR64 : RegisterClass<"X86", [i64], 64,
     GR64Class::allocation_order_end(const MachineFunction &MF) const {
       const TargetMachine &TM = MF.getTarget();
       const TargetRegisterInfo *RI = TM.getRegisterInfo();
+      const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
+      if (!Subtarget.is64Bit())
+        return begin();  // None of these are allocatable in 32-bit.
       if (RI->hasFP(MF)) // Does the function dedicate RBP to being a frame ptr?
         return end()-2;  // If so, don't allocate RSP or RBP
       else