Initial soft-float support for LegalizeTypes. I rewrote

the fcopysign expansion from LegalizeDAG to get rid of
what seems to be a bug: the use of sign extension means
that when copying the sign bit from an f32 to an f64,
the upper 32 bits of the f64 (now an i64) are set, not
just the top bit...  I also generalized it to work for
any sized floating point types, and removed the bogosity:
  SDOperand Mask1 = (SrcVT == MVT::f64)
    ? DAG.getConstantFP(BitsToDouble(1ULL << 63), SrcVT)
    : DAG.getConstantFP(BitsToFloat(1U << 31), SrcVT);
  Mask1 = DAG.getNode(ISD::BIT_CONVERT, SrcNVT, Mask1);
(here SrcNVT is an integer with the same size as SrcVT).
As far as I can see this takes a 1 << 63, converts to
a double, converts that to a floating point constant
then converts that to an integer constant, ending up
with... 1 << 63 as an integer constant!  So I just
generate this integer constant directly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48305 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 12 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypesPromote.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypesPromote.cpp
index 1a0dfe755d..eef7a83a10 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypesPromote.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypesPromote.cpp
@@ -234,25 +234,20 @@ SDOperand DAGTypeLegalizer::PromoteResult_BIT_CONVERT(SDNode *N) {
     break;
   case Expand:
     break;
+  case FloatToInt:
+    // Promote the integer operand by hand.
+    return DAG.getNode(ISD::ANY_EXTEND, OutVT, GetIntegerOp(InOp));
   case Scalarize:
     // Convert the element to an integer and promote it by hand.
-    InOp = DAG.getNode(ISD::BIT_CONVERT,
-                       MVT::getIntegerType(MVT::getSizeInBits(InVT)),
-                       GetScalarizedOp(InOp));
-    InOp = DAG.getNode(ISD::ANY_EXTEND,
-                       MVT::getIntegerType(MVT::getSizeInBits(OutVT)), InOp);
-    return DAG.getNode(ISD::BIT_CONVERT, OutVT, InOp);
+    return DAG.getNode(ISD::ANY_EXTEND, OutVT,
+                       BitConvertToInteger(GetScalarizedOp(InOp)));
   case Split:
     // For example, i32 = BIT_CONVERT v2i16 on alpha.  Convert the split
     // pieces of the input into integers and reassemble in the final type.
     SDOperand Lo, Hi;
     GetSplitOp(N->getOperand(0), Lo, Hi);
-
-    unsigned LoBits = MVT::getSizeInBits(Lo.getValueType());
-    Lo = DAG.getNode(ISD::BIT_CONVERT, MVT::getIntegerType(LoBits), Lo);
-
-    unsigned HiBits = MVT::getSizeInBits(Hi.getValueType());
-    Hi = DAG.getNode(ISD::BIT_CONVERT, MVT::getIntegerType(HiBits), Hi);
+    Lo = BitConvertToInteger(Lo);
+    Hi = BitConvertToInteger(Hi);
 
     if (TLI.isBigEndian())
       std::swap(Lo, Hi);