Move the constant-folding support for FP_ROUND in SelectionDAG from the one-operand version of getNode() to the two-operand version, since it became a two-operand node at sound point.
Zap a testcase that this allows us to completely fold away.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154447 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6e46d49..92671d1 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2428,7 +2428,6 @@
case ISD::FABS:
V.clearSign();
return getConstantFP(V, VT);
- case ISD::FP_ROUND:
case ISD::FP_EXTEND: {
bool ignored;
// This can return overflow, underflow, or inexact; we don't care.
@@ -2994,6 +2993,16 @@
default: break;
}
}
+
+ if (Opcode == ISD::FP_ROUND) {
+ APFloat V = N1CFP->getValueAPF(); // make copy
+ bool ignored;
+ // This can return overflow, underflow, or inexact; we don't care.
+ // FIXME need to be more flexible about rounding mode.
+ (void)V.convert(*EVTToAPFloatSemantics(VT),
+ APFloat::rmNearestTiesToEven, &ignored);
+ return getConstantFP(V, VT);
+ }
}
// Canonicalize an UNDEF to the RHS, even over a constant.