private void AssertSmallConst(string sExp, int shift, uint mult)
{
var m = new ProcedureBuilder();
var c = Constant.Int32((int)mult);
var r1 = m.Reg32("r1", 1);
var r2 = m.Reg32("r2", 2);
var r2_r1 = m.Frame.EnsureSequence(r2.Storage, r1.Storage, PrimitiveType.Word64);
var ass = m.Assign(r2_r1, m.SMul(r1, c));
m.Emit(new AliasAssignment(r2, m.Slice(PrimitiveType.Word32, r2_r1, 32)));
if (shift != 0)
m.Assign(r2, m.Sar(r2, shift));
var proc = m.Procedure;
var ssa = new SsaTransform(
null,
proc,
null,
proc.CreateBlockDominatorGraph(),
new HashSet<RegisterStorage>()).Transform();
var ctx = new SsaEvaluationContext(null, ssa.Identifiers);
var rule = new ConstDivisionImplementedByMultiplication(ssa);
ctx.Statement = proc.EntryBlock.Succ[0].Statements[0];
Assert.IsTrue(rule.Match(ass));
ass = rule.TransformInstruction();
Assert.AreEqual(sExp, ass.Src.ToString());
}
public void Cdiv_3()
{
/*
eax = ~0x33333332
edx_eax = esi *u eax
edx = edx >>u 0x03
*/
var c = Constant.UInt32(0x55555555);
var r1 = m.Reg32("r1");
var r2 = m.Reg32("r2");
var r2_r1 = m.Frame.EnsureSequence(r2, r1, PrimitiveType.Word64);
var ass = m.Assign(r2_r1, m.UMul(r1, c));
var proc = m.Procedure;
var ssa = new SsaTransform(null, proc, proc.CreateBlockDominatorGraph()).Transform();
var ctx = new SsaEvaluationContext(null, ssa.Identifiers);
var rule = new ConstDivisionImplementedByMultiplication(ctx);
//ctx.Statement = proc.EntryBlock.Succ[0].Statements[0];
//Assert.IsTrue(rule.Match((BinaryExpression) ass.Src));
//ass.Src = rule.Transform();
Assert.AreEqual("x = id /u 3", ass.ToString());
}
