From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 31 Aug 2010 21:51:07 +0000 (+0000)
Subject: Make %EFLAGS unallocatable.
X-Git-Tag: llvmorg-2.8.0-rc0~361
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=33e9fce2d645c0411de394fa39e6f4f2b541331f;p=platform%2Fupstream%2Fllvm.git

Make %EFLAGS unallocatable.

No CCR virtual registers should exist, and %EFLAGS is used in ways that can
surprise RegAllocFast.

llvm-svn: 112650
---

diff --git a/llvm/lib/Target/X86/X86RegisterInfo.td b/llvm/lib/Target/X86/X86RegisterInfo.td
index 176e87812d21..95269b15760e 100644
--- a/llvm/lib/Target/X86/X86RegisterInfo.td
+++ b/llvm/lib/Target/X86/X86RegisterInfo.td
@@ -833,4 +833,15 @@ def VR256 : RegisterClass<"X86", [v32i8, v8i32, v4i64, v8f32, v4f64], 256,
 // Status flags registers.
 def CCR : RegisterClass<"X86", [i32], 32, [EFLAGS]> {
   let CopyCost = -1;  // Don't allow copying of status registers.
+
+  // EFLAGS is not allocatable.
+  let MethodProtos = [{
+    iterator allocation_order_end(const MachineFunction &MF) const;
+  }];
+  let MethodBodies = [{
+    CCRClass::iterator
+    CCRClass::allocation_order_end(const MachineFunction &MF) const {
+      return allocation_order_begin(MF);
+    }
+  }];
 }