[llvm-commits] [llvm] r141206 - in /llvm/trunk/lib/Target/X86: X86RegisterInfo.cpp X86RegisterInfo.h

[Jakob Stoklund Olesen]

Author: stoklund
Date: Wed Oct  5 15:26:33 2011
New Revision: 141206

URL: http://llvm.org/viewvc/llvm-project?rev=141206&view=rev
Log:
Override TRI::getSubClassWithSubReg for X86.

There are fewer registers with sub_8bit sub-registers in 32-bit mode
than in 64-bit mode.  In 32-bit mode, sub_8bit behaves the same as
sub_8bit_hi.

Modified:
    llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp
    llvm/trunk/lib/Target/X86/X86RegisterInfo.h

Modified: llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp?rev=141206&r1=141205&r2=141206&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86RegisterInfo.cpp Wed Oct  5 15:26:33 2011
@@ -112,6 +112,18 @@
 }
 
 const TargetRegisterClass *
+X86RegisterInfo::getSubClassWithSubReg(const TargetRegisterClass *RC,
+                                       unsigned Idx) const {
+  // The sub_8bit sub-register index is more constrained in 32-bit mode.
+  // It behaves just like the sub_8bit_hi index.
+  if (!Is64Bit && Idx == X86::sub_8bit)
+    Idx = X86::sub_8bit_hi;
+
+  // Forward to TableGen's default version.
+  return X86GenRegisterInfo::getSubClassWithSubReg(RC, Idx);
+}
+
+const TargetRegisterClass *
 X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
                                           const TargetRegisterClass *B,
                                           unsigned SubIdx) const {

Modified: llvm/trunk/lib/Target/X86/X86RegisterInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86RegisterInfo.h?rev=141206&r1=141205&r2=141206&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86RegisterInfo.h (original)
+++ llvm/trunk/lib/Target/X86/X86RegisterInfo.h Wed Oct  5 15:26:33 2011
@@ -74,6 +74,9 @@
   getMatchingSuperRegClass(const TargetRegisterClass *A,
                            const TargetRegisterClass *B, unsigned Idx) const;
 
+  virtual const TargetRegisterClass *
+  getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const;
+
   const TargetRegisterClass*
   getLargestLegalSuperClass(const TargetRegisterClass *RC) const;