ARM: Implement the clz instruction.

2010-06-02 12:58:08 -05:00
parent 00320a53ab
commit 2c94bf7f30
1 changed files with 10 additions and 0 deletions
--- 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;