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Prog machine language object code data assembler sys

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Unformatted text preview: Data) Assembler (Sys. Prog.) Machine Language Executable Code (Data) Linker (Sys. Prog.) Subroutine Library Machine Language Object Code (Data) Loader (Sys. Prog.) Program in Computer Memory Spring 2014, Feb 10 . . . Spring ELEC 5200-001/6200-001 Lecture 4 Assembly Language Code (Data) 6 Compiler System program Inputs: Programming language code, e.g., a C program Instruction set (including pseudoinstructions) Memory and register organization Output: Assembly language code Compiler’s function Specific to ISA and machine organization Assigns variables to registers Translates C into assembly language Saves and restores registers $s0 through $s7 when compiling a Saves subroutine (or procedure) that uses them subroutine Spring 2014, Feb 10 . . . Spring ELEC 5200-001/6200-001 Lecture 4 7 Decreasing program dependence C or Java Code Spring 2014, Feb 10 . . . Spring Programming language specific, machine-independent processing Intermediate representation High-level optimization (loop transformation, procedure integration) Global optimization (register allocation, code optimization) Code generator ELEC 5200-001/6200-001 Lecture 4 Increasing machine dependence Compiler is a Multi-Pass Program MIPS Code 8 Compiler Optimizes Code Minimize number of machine instructions Example: x[i] = x[i] + 4, memory address for x[i] is Example: generated only once, saved in a register, and used by lw and sw – Common subexpression elimination. Common Local optimization within a block of...
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