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Author SHA1 Message Date
George Karpenkov 788087f5f8 Add checkMulAdd helper function to CheckedArithmetic 
Multiplication followed by addition
(https://en.wikipedia.org/wiki/Multiply–accumulate_operation) is a
sufficiently common use-case to warrant a separate helper.

Differential Revision: https://reviews.llvm.org/D48138

llvm-svn: 334635
 2018-06-13 18:32:02 +00:00
George Karpenkov 3bbaeaf673 Change checked arithmetic functions API to return Optional 
Returning optional is much safer.
The previous API had potential to cause use of undefined variables, if
the value passed by pointer was accidentally read afterwards.

Differential Revision: https://reviews.llvm.org/D48137

llvm-svn: 334634
 2018-06-13 18:31:43 +00:00
George Karpenkov 3f547fe857 Utility functions for checked arithmetic 
Provide checkedAdd and checkedMul functions, providing checked
arithmetic on signed integers.

Differential Revision: https://reviews.llvm.org/D43704

llvm-svn: 326516
 2018-03-02 00:30:43 +00:00