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Add a TargetInstrDescriptor flag to mark an instruction as "re-materializable".

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It means the instruction can be easily re-materialized at any point. e.g.
constant generation, load from constantpool.

llvm-svn: 35158
This commit is contained in:
Evan Cheng 2007-03-19 06:19:16 +00:00
parent 6ecf1045a6
commit 2081cf96ed
1 changed files with 7 additions and 0 deletions
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7
include/llvm/Target/TargetInstrInfo.h
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@ -78,6 +78,10 @@ const unsigned M_VARIABLE_OPS = 1 << 11;
// execution.
const unsigned M_PREDICATED = 1 << 12;
// M_REMATERIALIZIBLE - Set if this instruction can be trivally re-materialized
// at any time, e.g. constant generation, load from constant pool.
const unsigned M_REMATERIALIZIBLE = 1 << 13;
// Machine operand flags
// M_LOOK_UP_PTR_REG_CLASS - Set if this operand is a pointer value and it
@ -207,6 +211,9 @@ public:
bool isPredicated(MachineOpCode Opcode) const {
return get(Opcode).Flags & M_PREDICATED;
}
bool isReMaterializable(MachineOpCode Opcode) const {
return get(Opcode).Flags & M_REMATERIALIZIBLE;
}
bool isCommutableInstr(MachineOpCode Opcode) const {
return get(Opcode).Flags & M_COMMUTABLE;
}