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Add function returning which operand holds immediate constant

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for a given opcode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1307 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2001-11-14 18:48:36 +00:00
parent 9e29f78029
commit 4c5fe2d3ed
3 changed files with 30 additions and 0 deletions
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7
include/llvm/Target/MachineInstrInfo.h
View File

@ -210,6 +210,13 @@ public:
return getDescriptor(opCode).latency;
}
//
// Which operand holds an immediate constant? Returns -1 if none
//
virtual int getImmmedConstantPos(MachineOpCode opCode) const {
return -1; // immediate position is machine specific, so say -1 == "none"
}
// Check if the specified constant fits in the immediate field
// of this machine instruction
//

7
include/llvm/Target/TargetInstrInfo.h
View File

@ -210,6 +210,13 @@ public:
return getDescriptor(opCode).latency;
}
//
// Which operand holds an immediate constant? Returns -1 if none
//
virtual int getImmmedConstantPos(MachineOpCode opCode) const {
return -1; // immediate position is machine specific, so say -1 == "none"
}
// Check if the specified constant fits in the immediate field
// of this machine instruction
//

16
lib/Target/SparcV9/SparcV9Internals.h
View File

@ -90,6 +90,22 @@ class UltraSparcInstrInfo : public MachineInstrInfo {
public:
/*ctor*/ UltraSparcInstrInfo(const TargetMachine& tgt);
//
// All immediate constants are in position 0 except the
// store instructions.
//
virtual int getImmmedConstantPos(MachineOpCode opCode) const {
bool ignore;
if (this->maxImmedConstant(opCode, ignore) != 0)
{
assert(! this->isStore((MachineOpCode) STB - 1)); // first store is STB
assert(! this->isStore((MachineOpCode) STD + 1)); // last store is STD
return (opCode >= STB || opCode <= STD)? 2 : 1;
}
else
return -1;
}
virtual bool hasResultInterlock (MachineOpCode opCode) const
{
// All UltraSPARC instructions have interlocks (note that delay slots