From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 14 Dec 2010 23:28:01 +0000 (+0000)
Subject: Simplify CCState's use of register aliases.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=eb7464ebdad70ab5f24b747cea453051cf21a0f8

Simplify CCState's use of register aliases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121806 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CallingConvLower.cpp b/lib/CodeGen/CallingConvLower.cpp
index cb3f9acdfe7..2ad80b4d3a7 100644
--- a/lib/CodeGen/CallingConvLower.cpp
+++ b/lib/CodeGen/CallingConvLower.cpp
@@ -51,11 +51,9 @@ void CCState::HandleByVal(unsigned ValNo, MVT ValVT,
 
 /// MarkAllocated - Mark a register and all of its aliases as allocated.
 void CCState::MarkAllocated(unsigned Reg) {
-  UsedRegs[Reg/32] |= 1 << (Reg&31);
-  
-  if (const unsigned *RegAliases = TRI.getAliasSet(Reg))
-    for (; (Reg = *RegAliases); ++RegAliases)
-      UsedRegs[Reg/32] |= 1 << (Reg&31);
+  for (const unsigned *Alias = TRI.getOverlaps(Reg);
+       unsigned Reg = *Alias; ++Alias)
+    UsedRegs[Reg/32] |= 1 << (Reg&31);
 }
 
 /// AnalyzeFormalArguments - Analyze an array of argument values,