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Swap operands now preserves the semantics of the binary operator by changing

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the opcode of the instruction if possible.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1444 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2001-12-13 00:43:03 +00:00
parent 82d18aa0e4
commit 9a49b210c1
2 changed files with 34 additions and 4 deletions
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12
include/llvm/InstrTypes.h
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@ -127,10 +127,14 @@ public:
virtual const char *getOpcodeName() const = 0;
// swapOperands - Exchange the two operands to this instruction
void swapOperands() {
swap(Operands[0], Operands[1]);
}
// swapOperands - Exchange the two operands to this instruction.
// This instruction is safe to use on any binary instruction and
// does not modify the semantics of the instruction. If the
// instruction is order dependant (SetLT f.e.) the opcode is
// changed. If the instruction cannot be reversed (ie, it's a Div),
// then return true.
//
bool swapOperands();
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const BinaryOperator *) { return true; }