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Don't use register classes larger than TLI->getRegClassFor(VT).

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In Thumb mode we cannot handle GPR virtual registers, even though some
instructions can. When isel is lowering a CopyFromReg, it should limit
itself to subclasses of getRegClassFor(VT).

<rdar://problem/9624323>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133210 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-06-16 22:50:38 +00:00
parent ed344d2e68
commit c02a6fa7d8
2 changed files with 31 additions and 2 deletions
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9
lib/CodeGen/SelectionDAG/InstrEmitter.cpp
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@@ -76,6 +76,12 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
// the CopyToReg'd destination register instead of creating a new vreg.
bool MatchReg = true;
const TargetRegisterClass *UseRC = NULL;
EVT VT = Node->getValueType(ResNo);
// Stick to the preferred register classes for legal types.
if (TLI->isTypeLegal(VT))
UseRC = TLI->getRegClassFor(VT);
if (!IsClone && !IsCloned)
for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
UI != E; ++UI) {
@@ -121,10 +127,9 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
break;
}
EVT VT = Node->getValueType(ResNo);
const TargetRegisterClass *SrcRC = 0, *DstRC = 0;
SrcRC = TRI->getMinimalPhysRegClass(SrcReg, VT);
// Figure out the register class to create for the destreg.
if (VRBase) {
DstRC = MRI->getRegClass(VRBase);