From bdfd98a080609fbc90cc3ddbc4cc6ecfd9e39587 Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Mon, 17 Oct 2011 18:26:37 +0000
Subject: [PATCH] Redefine count-leading 0s and 1s instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142216 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/Mips64InstrInfo.td | 15 ++-------------
 lib/Target/Mips/MipsInstrInfo.td   | 22 +++++++++++++++-------
 2 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index 694dd572fb6..05470d5a4d4 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -57,15 +57,6 @@ class Mult64<bits<6> func, string instr_asm, InstrItinClass itin>:
 class Div64<SDNode op, bits<6> func, string instr_asm, InstrItinClass itin>:
   Div<op, func, instr_asm, itin, CPU64Regs, [HI64, LO64]>;
 
-// Count Leading Ones/Zeros in Word
-class CountLeading64<bits<6> func, string instr_asm, list<dag> pattern>:
-  FR<0x1c, func, (outs CPU64Regs:$dst), (ins CPU64Regs:$src),
-     !strconcat(instr_asm, "\t$dst, $src"), pattern, IIAlu>,
-     Requires<[HasBitCount]> {
-  let shamt = 0;
-  let rt = rd;
-}
-
 //===----------------------------------------------------------------------===//
 // Instruction definition
 //===----------------------------------------------------------------------===//
@@ -150,10 +141,8 @@ def MFHI64 : MoveFromLOHI<0x10, "mfhi", CPU64Regs, [HI64]>;
 def MFLO64 : MoveFromLOHI<0x12, "mflo", CPU64Regs, [LO64]>;
 
 /// Count Leading
-def DCLZ : CountLeading64<0x24, "dclz",
-                          [(set CPU64Regs:$dst, (ctlz CPU64Regs:$src))]>;
-def DCLO : CountLeading64<0x25, "dclo",
-                          [(set CPU64Regs:$dst, (ctlz (not CPU64Regs:$src)))]>;
+def DCLZ : CountLeading0<0x24, "dclz", CPU64Regs>;
+def DCLO : CountLeading1<0x25, "dclo", CPU64Regs>;
 
 //===----------------------------------------------------------------------===//
 //  Arbitrary patterns that map to one or more instructions
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index 1160b34c853..a93bc18e85a 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -513,9 +513,19 @@ class EffectiveAddress<string instr_asm> :
      instr_asm, [(set CPURegs:$rt, addr:$addr)], IIAlu>;
 
 // Count Leading Ones/Zeros in Word
-class CountLeading<bits<6> func, string instr_asm, list<dag> pattern>:
-  FR<0x1c, func, (outs CPURegs:$rd), (ins CPURegs:$rs),
-     !strconcat(instr_asm, "\t$rd, $rs"), pattern, IIAlu>,
+class CountLeading0<bits<6> func, string instr_asm, RegisterClass RC>:
+  FR<0x1c, func, (outs RC:$rd), (ins RC:$rs),
+     !strconcat(instr_asm, "\t$rd, $rs"),
+     [(set RC:$rd, (ctlz RC:$rs))], IIAlu>,
+     Requires<[HasBitCount]> {
+  let shamt = 0;
+  let rt = rd;
+}
+
+class CountLeading1<bits<6> func, string instr_asm, RegisterClass RC>:
+  FR<0x1c, func, (outs RC:$rd), (ins RC:$rs),
+     !strconcat(instr_asm, "\t$rd, $rs"),
+     [(set RC:$rd, (ctlz (not RC:$rs)))], IIAlu>,
      Requires<[HasBitCount]> {
   let shamt = 0;
   let rt = rd;
@@ -753,10 +763,8 @@ def SEB : SignExtInReg<0x10, "seb", i8>;
 def SEH : SignExtInReg<0x18, "seh", i16>;
 
 /// Count Leading
-def CLZ : CountLeading<0x20, "clz",
-                       [(set CPURegs:$rd, (ctlz CPURegs:$rs))]>;
-def CLO : CountLeading<0x21, "clo",
-                       [(set CPURegs:$rd, (ctlz (not CPURegs:$rs)))]>;
+def CLZ : CountLeading0<0x20, "clz", CPURegs>;
+def CLO : CountLeading1<0x21, "clo", CPURegs>;
 
 /// Byte Swap
 def WSBW : ByteSwap<0x20, 0x2, "wsbw">;
-- 
2.34.1