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Teach legalize to promote copy(from|to)reg, instead of making the isel pass

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do it.  This results in better code on X86 for floats (because if strict
precision is not required, we can elide some more expensive double -> float
conversions like the old isel did), and allows other targets to emit
CopyFromRegs that are not legal for arguments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19668 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-01-18 17:54:55 +00:00
parent b422aeac9e
commit ef5cd1d3cf
2 changed files with 13 additions and 26 deletions
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lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+1 -21
View File
@@ -292,19 +292,7 @@ public:
FuncInfo.ValueMap.find(V);
assert(VMI != FuncInfo.ValueMap.end() && "Value not in map!");
MVT::ValueType RegVT = VT;
if (TLI.getTypeAction(VT) == 1) // Must promote this value?
RegVT = TLI.getTypeToTransformTo(VT);
N = DAG.getCopyFromReg(VMI->second, RegVT, DAG.getEntryNode());
if (RegVT != VT)
if (MVT::isFloatingPoint(VT))
N = DAG.getNode(ISD::FP_ROUND, VT, N);
else
N = DAG.getNode(ISD::TRUNCATE, VT, N);
return N;
return N = DAG.getCopyFromReg(VMI->second, VT, DAG.getEntryNode());
}
const SDOperand &setValue(const Value *V, SDOperand NewN) {
@@ -843,14 +831,6 @@ CopyValueToVirtualRegister(SelectionDAGLowering &SDL, Value *V, unsigned Reg) {
assert((Op.getOpcode() != ISD::CopyFromReg ||
cast<RegSDNode>(Op)->getReg() != Reg) &&
"Copy from a reg to the same reg!");
MVT::ValueType VT = Op.getValueType();
if (TLI.getTypeAction(VT) == 1) { // Must promote this value?
if (MVT::isFloatingPoint(VT))
Op = DAG.getNode(ISD::FP_EXTEND, TLI.getTypeToTransformTo(VT), Op);
else
Op = DAG.getNode(ISD::ZERO_EXTEND, TLI.getTypeToTransformTo(VT), Op);
}
return DAG.getCopyToReg(SDL.getRoot(), Op, Reg);
}