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 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());
}