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add initial support for handling inline asms with multiple constraints.

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This doesn't do the "right thing" but will probably work in most cases.

This implements CodeGen/PowerPC/2007-01-29-lbrx-asm.ll.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33643 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-01-29 23:45:14 +00:00
parent db4e6e77fc
commit 367f109ba9
1 changed files with 42 additions and 4 deletions

46
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@ -2433,6 +2433,44 @@ 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][0]);
for (unsigned j = 1, e = C.size(); j != e; ++j) {
TargetLowering::ConstraintType ThisFlavor = TLI.getConstraintType(C[j][0]);
if (getConstraintGenerality(ThisFlavor) >
getConstraintGenerality(Flavor)) {
// This constraint letter is more general than the previous one,
// use it.
Flavor = ThisFlavor;
Current = &C[j];
}
}
return *Current;
}
/// visitInlineAsm - Handle a call to an InlineAsm object.
///
@ -2462,8 +2500,8 @@ void SelectionDAGLowering::visitInlineAsm(CallInst &I) {
std::set<unsigned> OutputRegs, InputRegs;
unsigned OpNum = 1;
for (unsigned i = 0, e = Constraints.size(); i != e; ++i) {
assert(Constraints[i].Codes.size() == 1 && "Only handles one code so far!");
std::string &ConstraintCode = Constraints[i].Codes[0];
std::string ConstraintCode =
GetMostGeneralConstraint(Constraints[i].Codes, TLI);
MVT::ValueType OpVT;
@ -2527,8 +2565,8 @@ void SelectionDAGLowering::visitInlineAsm(CallInst &I) {
OpNum = 1;
for (unsigned i = 0, e = Constraints.size(); i != e; ++i) {
assert(Constraints[i].Codes.size() == 1 && "Only handles one code so far!");
std::string &ConstraintCode = Constraints[i].Codes[0];
std::string ConstraintCode =
GetMostGeneralConstraint(Constraints[i].Codes, TLI);
switch (Constraints[i].Type) {
case InlineAsm::isOutput: {