Add CopyCost to TargetRegisterClass. This specifies the cost of copying a value
between two registers in the specific class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42123 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h
index a4846d8..dab5d20 100644
--- a/include/llvm/Target/MRegisterInfo.h
+++ b/include/llvm/Target/MRegisterInfo.h
@@ -70,6 +70,7 @@
const sc_iterator SubRegClasses;
const sc_iterator SuperRegClasses;
const unsigned RegSize, Alignment; // Size & Alignment of register in bytes
+ const int CopyCost;
const iterator RegsBegin, RegsEnd;
public:
TargetRegisterClass(unsigned id,
@@ -78,10 +79,11 @@
const TargetRegisterClass * const *supcs,
const TargetRegisterClass * const *subregcs,
const TargetRegisterClass * const *superregcs,
- unsigned RS, unsigned Al, iterator RB, iterator RE)
+ unsigned RS, unsigned Al, int CC,
+ iterator RB, iterator RE)
: ID(id), VTs(vts), SubClasses(subcs), SuperClasses(supcs),
SubRegClasses(subregcs), SuperRegClasses(superregcs),
- RegSize(RS), Alignment(Al), RegsBegin(RB), RegsEnd(RE) {}
+ RegSize(RS), Alignment(Al), CopyCost(CC), RegsBegin(RB), RegsEnd(RE) {}
virtual ~TargetRegisterClass() {} // Allow subclasses
/// getID() - Return the register class ID number.
@@ -258,6 +260,10 @@
/// getAlignment - Return the minimum required alignment for a register of
/// this class.
unsigned getAlignment() const { return Alignment; }
+
+ /// getCopyCost - Return the cost of copying a value between two registers in
+ /// this class.
+ int getCopyCost() const { return CopyCost; }
};
diff --git a/lib/Target/Target.td b/lib/Target/Target.td
index 4e495fb..15213ce 100644
--- a/lib/Target/Target.td
+++ b/lib/Target/Target.td
@@ -104,6 +104,12 @@
//
int Alignment = alignment;
+ // CopyCost - This value is used to specify the cost of copying a value
+ // between two registers in this register class. The default value is one
+ // meaning it takes a single instruction to perform the copying. A negative
+ // value means copying is extremely expensive or impossible.
+ int CopyCost = 1;
+
// MemberList - Specify which registers are in this class. If the
// allocation_order_* method are not specified, this also defines the order of
// allocation used by the register allocator.
diff --git a/utils/TableGen/CodeGenRegisters.h b/utils/TableGen/CodeGenRegisters.h
index cee81e9..a5636e3 100644
--- a/utils/TableGen/CodeGenRegisters.h
+++ b/utils/TableGen/CodeGenRegisters.h
@@ -38,6 +38,7 @@
std::vector<MVT::ValueType> VTs;
unsigned SpillSize;
unsigned SpillAlignment;
+ int CopyCost;
std::vector<Record*> SubRegClasses;
std::string MethodProtos, MethodBodies;
diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 1fee306..c73ffb9 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -221,6 +221,7 @@
Namespace = R->getValueAsString("Namespace");
SpillSize = Size ? Size : MVT::getSizeInBits(VTs[0]);
SpillAlignment = R->getValueAsInt("Alignment");
+ CopyCost = R->getValueAsInt("CopyCost");
MethodBodies = R->getValueAsCode("MethodBodies");
MethodProtos = R->getValueAsCode("MethodProtos");
}
diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index 06c575d..2f948af 100644
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -384,8 +384,10 @@
<< RC.getName() + "SubRegClasses" << ", "
<< RC.getName() + "SuperRegClasses" << ", "
<< RC.SpillSize/8 << ", "
- << RC.SpillAlignment/8 << ", " << RC.getName() << ", "
- << RC.getName() << " + " << RC.Elements.size() << ") {}\n";
+ << RC.SpillAlignment/8 << ", "
+ << RC.CopyCost << ", "
+ << RC.getName() << ", " << RC.getName() << " + " << RC.Elements.size()
+ << ") {}\n";
}
OS << "}\n";