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Re-apply 91623 now that I actually know what I was trying to do.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91655 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-12-18 01:59:21 +00:00
parent 92329c7fbe
commit c7928f8f4e
1 changed files with 1 additions and 25 deletions
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26
lib/Target/X86/X86ISelDAGToDAG.cpp
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@@ -50,9 +50,6 @@
#include "llvm/ADT/Statistic.h" #include "llvm/ADT/Statistic.h"
using namespace llvm; using namespace llvm;
#include "llvm/Support/CommandLine.h"
static cl::opt<bool> AvoidDupAddrCompute("x86-avoid-dup-address", cl::Hidden);
STATISTIC(NumLoadMoved, "Number of loads moved below TokenFactor"); STATISTIC(NumLoadMoved, "Number of loads moved below TokenFactor");
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
@@ -1275,28 +1272,7 @@ bool X86DAGToDAGISel::SelectAddr(SDValue Op, SDValue N, SDValue &Base,
SDValue &Scale, SDValue &Index, SDValue &Scale, SDValue &Index,
SDValue &Disp, SDValue &Segment) { SDValue &Disp, SDValue &Segment) {
X86ISelAddressMode AM; X86ISelAddressMode AM;
bool Done = false; if (MatchAddress(N, AM))
if (AvoidDupAddrCompute && !N.hasOneUse()) {
unsigned Opcode = N.getOpcode();
if (Opcode != ISD::Constant && Opcode != ISD::FrameIndex &&
Opcode != X86ISD::Wrapper && Opcode != X86ISD::WrapperRIP) {
// If we are able to fold N into addressing mode, then we'll allow it even
// if N has multiple uses. In general, addressing computation is used as
// addresses by all of its uses. But watch out for CopyToReg uses, that
// means the address computation is liveout. It will be computed by a LEA
// so we want to avoid computing the address twice.
for (SDNode::use_iterator UI = N.getNode()->use_begin(),
UE = N.getNode()->use_end(); UI != UE; ++UI) {
if (UI->getOpcode() == ISD::CopyToReg) {
MatchAddressBase(N, AM);
Done = true;
break;
}
}
}
}
if (!Done && MatchAddress(N, AM))
return false; return false;
EVT VT = N.getValueType(); EVT VT = N.getValueType();