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refactor some code, no functionality change

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36590 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-04-30 17:16:27 +00:00
parent 1f6f4c7346
commit 3ff90dc1c8
1 changed files with 52 additions and 44 deletions
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96
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -3134,44 +3134,6 @@ GetRegistersForValue(const std::string &ConstrCode,
return RegsForValue();
}
/// getConstraintGenerality - Return an integer indicating how general CT is.
static unsigned getConstraintGenerality(TargetLowering::ConstraintType CT) {
switch (CT) {
default: assert(0 && "Unknown constraint type!");
case TargetLowering::C_Other:
case TargetLowering::C_Unknown:
return 0;
case TargetLowering::C_Register:
return 1;
case TargetLowering::C_RegisterClass:
return 2;
case TargetLowering::C_Memory:
return 3;
}
}
static std::string GetMostGeneralConstraint(std::vector<std::string> &C,
const TargetLowering &TLI) {
assert(!C.empty() && "Must have at least one constraint");
if (C.size() == 1) return C[0];
std::string *Current = &C[0];
// If we have multiple constraints, try to pick the most general one ahead
// of time. This isn't a wonderful solution, but handles common cases.
TargetLowering::ConstraintType Flavor = TLI.getConstraintType(Current[0]);
for (unsigned j = 1, e = C.size(); j != e; ++j) {
TargetLowering::ConstraintType ThisFlavor = TLI.getConstraintType(C[j]);
if (getConstraintGenerality(ThisFlavor) >
getConstraintGenerality(Flavor)) {
// This constraint letter is more general than the previous one,
// use it.
Flavor = ThisFlavor;
Current = &C[j];
}
}
return *Current;
}
namespace {
/// AsmOperandInfo - This contains information for each constraint that we are
/// lowering.
@ -3197,9 +3159,59 @@ struct AsmOperandInfo : public InlineAsm::ConstraintInfo {
ConstraintType(TargetLowering::C_Unknown),
CallOperand(0,0), CallOperandVal(0), ConstraintVT(MVT::Other) {
}
void ComputeConstraintToUse(const TargetLowering &TLI);
};
} // end anon namespace.
/// getConstraintGenerality - Return an integer indicating how general CT is.
static unsigned getConstraintGenerality(TargetLowering::ConstraintType CT) {
switch (CT) {
default: assert(0 && "Unknown constraint type!");
case TargetLowering::C_Other:
case TargetLowering::C_Unknown:
return 0;
case TargetLowering::C_Register:
return 1;
case TargetLowering::C_RegisterClass:
return 2;
case TargetLowering::C_Memory:
return 3;
}
}
void AsmOperandInfo::ComputeConstraintToUse(const TargetLowering &TLI) {
assert(!Codes.empty() && "Must have at least one constraint");
std::string *Current = &Codes[0];
TargetLowering::ConstraintType CurType = TLI.getConstraintType(*Current);
if (Codes.size() == 1) { // Single-letter constraints ('r') are very common.
ConstraintCode = *Current;
ConstraintType = CurType;
return;
}
unsigned CurGenerality = getConstraintGenerality(CurType);
// If we have multiple constraints, try to pick the most general one ahead
// of time. This isn't a wonderful solution, but handles common cases.
for (unsigned j = 1, e = Codes.size(); j != e; ++j) {
TargetLowering::ConstraintType ThisType = TLI.getConstraintType(Codes[j]);
unsigned ThisGenerality = getConstraintGenerality(ThisType);
if (ThisGenerality > CurGenerality) {
// This constraint letter is more general than the previous one,
// use it.
CurType = ThisType;
Current = &Codes[j];
CurGenerality = ThisGenerality;
}
}
ConstraintCode = *Current;
ConstraintType = CurType;
}
/// visitInlineAsm - Handle a call to an InlineAsm object.
///
void SelectionDAGLowering::visitInlineAsm(CallInst &I) {
@ -3274,12 +3286,8 @@ void SelectionDAGLowering::visitInlineAsm(CallInst &I) {
OpInfo.ConstraintVT = OpVT;
// Compute the constraint code to use.
OpInfo.ConstraintCode = GetMostGeneralConstraint(OpInfo.Codes, TLI);
// Compute the constraint type.
// FIXME: merge this into GetMostGeneralConstraint.
OpInfo.ConstraintType = TLI.getConstraintType(OpInfo.ConstraintCode);
// Compute the constraint code and ConstraintType to use.
OpInfo.ComputeConstraintToUse(TLI);
// If this is a memory input, and if the operand is not indirect, do what we