From ca0e80fc6b927e48363387a8f721883141f8b2b3 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Thu, 20 Mar 2008 02:18:41 +0000 Subject: Fix this xform: (sra (shl X, m), result_size) -> (sign_extend (trunc (shl X, result_size - n - m))) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48578 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen/SelectionDAG') diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index f33946c..f631849 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2400,7 +2400,9 @@ SDOperand DAGCombiner::visitSRA(SDNode *N) { // 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)) { + if (ShiftAmt != 0 && + TLI.isTypeLegal(TruncVT) && + 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); -- cgit v1.1