From b560acfe17b5898d0c68715f9d1cb7e1dd1f006f Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Mon, 27 Jul 2009 00:52:59 -0700
Subject: ARM: Fix the CLZ instruction.

---
 src/arch/arm/isa/decoder.isa | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'src/arch/arm/isa')

diff --git a/src/arch/arm/isa/decoder.isa b/src/arch/arm/isa/decoder.isa
index f43395c19..046e52950 100644
--- a/src/arch/arm/isa/decoder.isa
+++ b/src/arch/arm/isa/decoder.isa
@@ -113,8 +113,7 @@ format DataOp {
                 0x1: decode OPCODE {
                     0x9: BranchExchange::bx({{ }});
                     0xb: PredOp::clz({{
-                        unsigned lsb = findLsbSet(Rm);
-                        Rd = (lsb > 31) ? 32 : lsb;
+                        Rd = ((Rm == 0) ? 32 : (31 - findMsbSet(Rm)));
                     }});
                 }
                 0x2: decode OPCODE {
-- 
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