From 2c94bf7f30d3e9febe30485cf7182b650f48f4d5 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 2 Jun 2010 12:58:08 -0500
Subject: ARM: Implement the clz instruction.

---
 src/arch/arm/isa/insts/misc.isa | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/arch/arm')

diff --git a/src/arch/arm/isa/insts/misc.isa b/src/arch/arm/isa/insts/misc.isa
index 09d27360e..c673372bb 100644
--- a/src/arch/arm/isa/insts/misc.isa
+++ b/src/arch/arm/isa/insts/misc.isa
@@ -174,6 +174,16 @@ let {{
     decoder_output += RevOpConstructor.subst(rbitIop)
     exec_output += PredOpExecute.subst(rbitIop)
 
+    clzCode = '''
+        Dest = (Op1 == 0) ? 32 : (31 - findMsbSet(Op1));
+    '''
+    clzIop = InstObjParams("clz", "ClzInst", "RevOp",
+                           { "code": clzCode,
+                             "predicate_test": predicateTest }, [])
+    header_output += RevOpDeclare.subst(clzIop)
+    decoder_output += RevOpConstructor.subst(clzIop)
+    exec_output += PredOpExecute.subst(clzIop)
+
     ssatCode = '''
         int32_t operand = shift_rm_imm(Op1, shiftAmt, shiftType, 0);
         int32_t res;
-- 
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