Fix X86's isTruncateFree to not claim that truncate to i1 is free. This fixes Bill's testcase that failed for r48491.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48542 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index acc00fd..f33946c 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2383,6 +2383,31 @@
DAG.getConstant(Sum, N1C->getValueType(0)));
}
}
+
+ // fold sra (shl X, m), result_size - n
+ // -> (sign_extend (trunc (shl X, result_size - n - m))) for
+ // result_size - n != m. If truncate is free for the target sext(shl) is
+ // likely to result in better code.
+ if (N0.getOpcode() == ISD::SHL) {
+ // Get the two constanst of the shifts, CN0 = m, CN = n.
+ const ConstantSDNode *N01C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
+ if (N01C && N1C) {
+ // Determine if the truncate type's bitsize would correspond to
+ // an integer type for this target.
+ unsigned VTValSize = MVT::getSizeInBits(VT);
+ MVT::ValueType TruncVT = MVT::getIntegerType(VTValSize - N1C->getValue());
+ unsigned ShiftAmt = N1C->getValue() - N01C->getValue();
+
+ // If the shift wouldn't be a noop, the truncated type is an actual type,
+ // and the truncate is free, then proceed with the transform.
+ if (ShiftAmt != 0 && TLI.isTruncateFree(VT, TruncVT)) {
+ SDOperand Amt = DAG.getConstant(ShiftAmt, TLI.getShiftAmountTy());
+ SDOperand Shift = DAG.getNode(ISD::SRL, VT, N0.getOperand(0), Amt);
+ SDOperand Trunc = DAG.getNode(ISD::TRUNCATE, TruncVT, Shift);
+ return DAG.getNode(ISD::SIGN_EXTEND, N->getValueType(0), Trunc);
+ }
+ }
+ }
// Simplify, based on bits shifted out of the LHS.
if (N1C && SimplifyDemandedBits(SDOperand(N, 0)))