- /// isSafeToSpeculativelyExecute - Return true if the instruction does not
- /// have any effects besides calculating the result and does not have
- /// undefined behavior.
- ///
- /// This method never returns true for an instruction that returns true for
- /// mayHaveSideEffects; however, this method also does some other checks in
- /// addition. It checks for undefined behavior, like dividing by zero or
- /// loading from an invalid pointer (but not for undefined results, like a
- /// shift with a shift amount larger than the width of the result). It checks
- /// for malloc and alloca because speculatively executing them might cause a
- /// memory leak. It also returns false for instructions related to control
- /// flow, specifically terminators and PHI nodes.
- ///
- /// This method only looks at the instruction itself and its operands, so if
- /// this method returns true, it is safe to move the instruction as long as
- /// the correct dominance relationships for the operands and users hold.
- /// However, this method can return true for instructions that read memory;
- /// for such instructions, moving them may change the resulting value.
- bool isSafeToSpeculativelyExecute() const;
-