From 1a0034c74a0a8562199f9e6a00feb0a80619b886 Mon Sep 17 00:00:00 2001
From: Hal Finkel <hfinkel@anl.gov>
Date: Tue, 26 Mar 2013 21:50:26 +0000
Subject: [PATCH] Restore real bit lengths on PPC register numbers

As suggested by Bill Schmidt (in reviewing r178067), use the real register
number bit lengths (which is self-documenting, and prevents using illegal
numbers), and set only the relevant bits in HWEncoding (which defaults to 0).

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178077 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCRegisterInfo.td | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/lib/Target/PowerPC/PPCRegisterInfo.td b/lib/Target/PowerPC/PPCRegisterInfo.td
index 28c590cc790..c5e325545d3 100644
--- a/lib/Target/PowerPC/PPCRegisterInfo.td
+++ b/lib/Target/PowerPC/PPCRegisterInfo.td
@@ -26,8 +26,8 @@ class PPCReg<string n> : Register<n> {
 // We identify all our registers with a 5-bit ID, for consistency's sake.
 
 // GPR - One of the 32 32-bit general-purpose registers
-class GPR<bits<16> num, string n> : PPCReg<n> {
-  let HWEncoding = num;
+class GPR<bits<5> num, string n> : PPCReg<n> {
+  let HWEncoding{4-0} = num;
 }
 
 // GP8 - One of the 32 64-bit general-purpose registers
@@ -38,29 +38,29 @@ class GP8<GPR SubReg, string n> : PPCReg<n> {
 }
 
 // SPR - One of the 32-bit special-purpose registers
-class SPR<bits<16> num, string n> : PPCReg<n> {
-  let HWEncoding = num;
+class SPR<bits<10> num, string n> : PPCReg<n> {
+  let HWEncoding{9-0} = num;
 }
 
 // FPR - One of the 32 64-bit floating-point registers
-class FPR<bits<16> num, string n> : PPCReg<n> {
-  let HWEncoding = num;
+class FPR<bits<5> num, string n> : PPCReg<n> {
+  let HWEncoding{4-0} = num;
 }
 
 // VR - One of the 32 128-bit vector registers
-class VR<bits<16> num, string n> : PPCReg<n> {
-  let HWEncoding = num;
+class VR<bits<5> num, string n> : PPCReg<n> {
+  let HWEncoding{4-0} = num;
 }
 
 // CR - One of the 8 4-bit condition registers
-class CR<bits<16> num, string n, list<Register> subregs> : PPCReg<n> {
-  let HWEncoding = num;
+class CR<bits<3> num, string n, list<Register> subregs> : PPCReg<n> {
+  let HWEncoding{2-0} = num;
   let SubRegs = subregs;
 }
 
 // CRBIT - One of the 32 1-bit condition register fields
-class CRBIT<bits<16> num, string n> : PPCReg<n> {
-  let HWEncoding = num;
+class CRBIT<bits<5> num, string n> : PPCReg<n> {
+  let HWEncoding{4-0} = num;
 }
 
 // General-purpose registers