A Lightweight Instruction Scheduling Algorithm For Just In Time Compiler

Presenter : Shuai-wei Huang Date : 2007/11/21 A Lightweight Instruction Scheduling Algorithm for Just-In-Time Compiler on XScale Xiaohua Shi Peng Guo Programming System Lab Microprocessor Technology Labs {xiaohua.shi,peng.guo }@intel.com

Contents Introduction 1 XSCALE CORE PIPELINES 2 LIS Algorithm 3 Performance Evaluation 4 Conclusions 5

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction Related work ,[object Object],n^2 DAG 1986 Gibbons & Muchnick (List Scheduling) n^2 DAG 1995 Kurlander,Proebsting,and Fischer (DLS) n^2 DAG 1988 Goodman & Hsu (IPS) DAG construct complexity Date structure Publish year Author

Introduction DAG Example ,[object Object]

Introduction XORP JIT ,[object Object],[object Object],[object Object],[object Object]

XSCALE CORE PIPELINES Superpipeline ,[object Object]

XSCALE CORE PIPELINES Out-of-order ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

XSCALE CORE PIPELINES Resource conflicts ,[object Object],[object Object],[object Object],[object Object]

XSCALE CORE PIPELINES load-use instruction ,[object Object],[object Object],...; prepare outgoing arguments I0: ldr R12, [R0] ; //get vtable from object handle I1: ldr R12, [R12 + offset] ; //vtable + offset equals to the address of the method entry I2: blx R12 ; //indirect branch to the method entry

LIS Algorithm EDM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LIS Algorithm Re-ordered native instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LIS Algorithm stall enclosure ,[object Object],[object Object],[object Object]

LIS Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(A) Ceil n (B) Stl_En n nth inst. (C) Ceil y (D) Stl_En y yth inst. (E)

LIS Algorithm Complexity ,[object Object],[object Object]

LIS Algorithm Static counts of total instructions and stalled instructions ,[object Object]

LIS Algorithm Complexity (build EDM) ,[object Object],[object Object],[object Object],[object Object]

Performance Evaluation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Performance Evaluation ,[object Object]

Conclusions ,[object Object],[object Object],[object Object]

A Lightweight Instruction Scheduling Algorithm For Just In Time Compiler

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