mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2025-04-02 13:12:09 +00:00
aa2810b6e7
computeKnownBits will indicate the sign bit of abs is 0 if the the RHS operand returned by matchSelectPattern has the nsw flag set. For abs idioms like (X >= 0) ? X : -X, the RHS returns -X. But we can also match ((X-Y) >= 0 ? X-Y : Y-X as abs. In this case RHS will be the Y-X operand. According to Alive, the sign bit for this is only 0 if both the X-Y and Y-X operands have the nsw flag. But we're only checking the Y-X operand. llvm-svn: 367747
The LLVM Compiler Infrastructure
This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.