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Add some bits that can be set on instructions. Renumber existing bits so

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they are dense.  Add a virtual method that targets can choose to implement.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19242 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-02 02:28:31 +00:00
parent 273f2280f2
commit 15f63ad2e5
1 changed files with 30 additions and 5 deletions
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35
include/llvm/Target/TargetInstrInfo.h
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@ -50,16 +50,27 @@ const unsigned M_RET_FLAG = 1 << 3;
const unsigned M_BARRIER_FLAG = 1 << 4;
const unsigned M_DELAY_SLOT_FLAG = 1 << 5;
const unsigned M_CC_FLAG = 1 << 6;
const unsigned M_LOAD_FLAG = 1 << 10;
const unsigned M_STORE_FLAG = 1 << 12;
// 3-addr instructions which really work like 2-addr ones, eg. X86 add/sub
const unsigned M_2_ADDR_FLAG = 1 << 15;
const unsigned M_LOAD_FLAG = 1 << 7;
const unsigned M_STORE_FLAG = 1 << 8;
// M_2_ADDR_FLAG - 3-addr instructions which really work like 2-addr ones.
const unsigned M_2_ADDR_FLAG = 1 << 9;
// M_CONVERTIBLE_TO_3_ADDR - This is a M_2_ADDR_FLAG instruction which can be
// changed into a 3-address instruction if the first two operands cannot be
// assigned to the same register. The target must implement the
// TargetInstrInfo::convertToThreeAddress method for this instruction.
const unsigned M_CONVERTIBLE_TO_3_ADDR = 1 << 10;
// This M_COMMUTABLE - is a 2- or 3-address instruction (of the form X = op Y,
// Z), which produces the same result if Y and Z are exchanged.
const unsigned M_COMMUTABLE = 1 << 11;
// M_TERMINATOR_FLAG - Is this instruction part of the terminator for a basic
// block? Typically this is things like return and branch instructions.
// Various passes use this to insert code into the bottom of a basic block, but
// before control flow occurs.
const unsigned M_TERMINATOR_FLAG = 1 << 16;
const unsigned M_TERMINATOR_FLAG = 1 << 12;
class TargetInstrDescriptor {
public:
@ -152,6 +163,20 @@ public:
return false;
}
/// convertToThreeAddress - This method must be implemented by targets that
/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
/// may be able to convert a two-address instruction into a true
/// three-address instruction on demand. This allows the X86 target (for
/// example) to convert ADD and SHL instructions into LEA instructions if they
/// would require register copies due to two-addressness.
///
/// This method returns a null pointer if the transformation cannot be
/// performed, otherwise it returns the new instruction.
///
virtual MachineInstr *convertToThreeAddress(MachineInstr *TA) const {
return 0;
}
/// Insert a goto (unconditional branch) sequence to TMBB, at the
/// end of MBB
virtual void insertGoto(MachineBasicBlock& MBB,