Code Compaction optimizations: Optimizations strategies for code compaction that are spec'ed out. a) Loop Rereolling in straight line code. In this optimization isomorphic operation in a Control flow graph are rolled out in a loop reducing code size. To identify...
Four live ranges L1/L2/L3/L4. Live range L1 for variable ‘a’ spans the loop but has no references ‘a’ inside the Loop. similarly, live range L2 for variable ‘b’ spans the loop but has no references for ‘b’ inside the loop. Live range L3 for ‘p’ spans the loop and has references for ‘p’...
Live range splitting at each use points increases the number of live ranges that could be performance bottleneck. Split partner ranges could be assigned different registers increasing more copies. Increase in copies can be reduced using following methods. a) Downward code motion of...
Unaligned memory access in vectorization For misaligned array access inside the loops for aligned architecture, vectorization is done with respect to shifting after loading the memory aligned and shifting the vector values and also permute. We support unaliagned memory load movupd...
Register Allocation on SSA Graphs. The SSA graph has the property that def dominates uses. This makes the SSA graph strict. Due to this property the live range is the subset of dominator tree. The live range L1 interferes the L2 if the def of L1 dominates the def of L2. And if the L2...
Live range splitting optimization. There is an important concept above the Live range splitting. If the interference graph is not colorable then the allocator goes for Live range splitting, and it splits the live ranges. This makes the graph colorable. There are different algorithm for...
Static Single Assignment. Each definition has a different version and the def dominates the uses. Such representation of SSA is strict and conventional. The non-conventional SSA is the representation where the different versions of the same variable is live at the same time. If the...
Register Allocation Chaitin’s and Brigg’s register allocator has different phases. Renumber: I dentification of Live ranges: Live ranges identification is the backward Data flow problem. Live(v) = Availability & Anticipability. According to Fred Chow...
Co-author: Swapnali Pawar .NET is a free, open source language. You can use multiple languages, libraries, APIs along with .NET to develop web applications, mobile applications, games, and so on. .NET 9 offers high-level features and enhancements and delivers better performance without...