From 06886aaaebe38b7e4b253b336624c9a7ab6dbc44 Mon Sep 17 00:00:00 2001 From: Owen Anderson Date: Tue, 10 Apr 2012 22:46:53 +0000 Subject: 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 --- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen') 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 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 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 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 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. -- cgit v1.1