private void RunTest(string sExp, Action <ProcedureBuilder> bld)
{
var m = new ProcedureBuilder();
bld(m);
var proc = m.Procedure;
var alias = new Aliases(proc);
alias.Transform();
var ssa = new SsaTransform(
null,
proc,
null,
proc.CreateBlockDominatorGraph(),
new HashSet <RegisterStorage>()).Transform();
var segmentMap = new SegmentMap(Address.Ptr32(0));
var vp = new ValuePropagator(segmentMap, ssa, null, null);
vp.Transform();
var rule = new ConstDivisionImplementedByMultiplication(ssa);
rule.Transform();
var sw = new StringWriter();
proc.Write(false, sw);
if (sExp != sw.ToString())
{
Debug.Print("{0}", sw);
Assert.AreEqual(sExp, sw.ToString());
}
}
private void RunTest(string sExp, Action <ProcedureBuilder> bld)
{
var m = new ProcedureBuilder();
bld(m);
var proc = m.Procedure;
var ssa = new SsaTransform(
new Program {
Architecture = m.Architecture
},
proc,
null,
null,
null).Transform();
var segmentMap = new SegmentMap(Address.Ptr32(0));
var vp = new ValuePropagator(segmentMap, ssa, new CallGraph(), null, null);
vp.Transform();
var rule = new ConstDivisionImplementedByMultiplication(ssa);
rule.Transform();
var sw = new StringWriter();
proc.Write(false, sw);
if (sExp != sw.ToString())
{
Debug.Print("{0}", sw);
Assert.AreEqual(sExp, sw.ToString());
}
}
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.Alias(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, null);
var rule = new ConstDivisionImplementedByMultiplication(ssa);
ctx.Statement = proc.EntryBlock.Succ[0].Statements[0];
Assert.IsTrue(rule.Match(ass));
var instr = rule.TransformInstruction();
Assert.AreEqual(sExp, instr.Src.ToString());
}
private void Frac(int num, int denom)
{
var q = (double)num / denom;
var n = (uint)Math.Round(q * Math.Pow(2.0, 32));
var rat = ConstDivisionImplementedByMultiplication.FindBestRational(n);
Debug.Print("{0}/{1} - {2}", num, denom, rat);
if (num != rat.Numerator ||
denom != rat.Denominator)
{
Debug.Print("***** inexact *****");
}
}
private void Frac(int num, int denom)
{
var q = (double)num / denom;
var n = (uint)Math.Round(q * Math.Pow(2.0, 32));
var f = n * Math.Pow(2.0, -32);
var rat = ConstDivisionImplementedByMultiplication.ContinuedFraction(f);
if (num != rat.Numerator ||
denom != rat.Denominator)
{
Debug.Print("***** inexact *****");
}
}
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(PrimitiveType.Word64, r2.Storage, r1.Storage);
var ass = m.Assign(r2_r1, m.SMul(r1, c));
m.Alias(r2, m.Slice(PrimitiveType.Word32, r2_r1, 32));
if (shift != 0)
{
m.Assign(r2, m.Sar(r2, shift));
}
m.MStore(m.Word32(0x0402000), r2); // Force use of r2
m.Return();
var proc = m.Procedure;
var flow = new ProgramDataFlow();
var program = new Program()
{
Architecture = m.Architecture,
};
var sst = new SsaTransform(
program,
proc,
new HashSet <Procedure>(),
null,
flow);
sst.Transform();
proc.Dump(true);
var ctx = new SsaEvaluationContext(m.Architecture, sst.SsaState.Identifiers, null);
var rule = new ConstDivisionImplementedByMultiplication(sst.SsaState);
ctx.Statement = proc.EntryBlock.Succ[0].Statements[0];
Assert.IsTrue(rule.Match(ctx.Statement.Instruction));
var instr = rule.TransformInstruction();
Assert.AreEqual(sExp, instr.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());
}