This book constitutes the thoroughly refereed post-conference proceedings of the 25th International Workshop on Languages and Compilers for Parallel Computing, LCPC 2012, held in Tokyo, Japan, in September 2012.

Invited Talk.- Just in Time Load Balancing.- Workshop Papers.- AlphaZ: A System for Design Space Exploration in the Polyhedral Model.- Compiler Optimizations: Machine Learning versus O3.- The STAPL Parallel Graph Library.- Set and Relation Manipulation for the Sparse Polyhedral Framework.- Parallel Clustered Low-Rank Approximation of Graphs and Its Application to Link Prediction.- OmpSs-OpenCL Programming Model for Heterogeneous Systems.- Compiler Optimizations for Industrial Unstructured Mesh CFD Applications on GPUs.- UCIFF: Unified Cluster Assignment Instruction Scheduling and Fast Frequency Selection for Heterogeneous Clustered VLIW Cores.- A Study on the Impact of Compiler Optimizations on High-Level Synthesis.- FlowPools: A Lock-Free Deterministic Concurrent Dataflow Abstraction.- Task Parallelism and Data Distribution: An Overview of Explicit Parallel Programming Languages.- A Fast Parallel Graph Partitioner for Shared-Memory Inspector/Executor Strategies.- A Software-Based Method-Level Speculation Framework for the Java Platform.- Ant: A Debugging Framework for MPI Parallel Programs.- Compiler Automatic Discovery of OmpSs Task Dependencies.- Beyond Do Loops: Data Transfer Generation with Convex Array Regions.- Workshop Posters.- Finish Accumulators: An Efficient Reduction Construct for Dynamic Task Parallelism.- FlashbackSTM: Improving STM Performance by Remembering the Past.- Kaira: Generating Parallel Libraries and Their Usage with Octave.- Language and Architecture Independent Software Thread-Level Speculation.- Abstractions for Defining Semi-Regular Grids Orthogonally from Stencils.