A jump table is an array where entry is the address

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: d and debug. We use them in our presentation as a way to construct C programs that describe the control flow of assembly-code programs. We call such C programs “goto code.” The assembly code implementation first compares the two operands (line 3), setting the condition codes. If the comparison result indicates that x is less than y, it then jumps to a block of code that computes x-y (line 9). Otherwise it continues with the execution of code that computes y-x (lines 5 and 6). In both cases the computed result is stored in register %eax, and ends up at line 10, at which point it executes the stack completion code (not shown). The general form of an if-else statement in C is given by the if-else statement following template: if (test-expr) then-statement else else-statement where test-expr is an integer expression that evaluates either to 0 (interpreted as meaning “false”) or to a nonzero value (interpreted as meaning “true”). Only one of the two branch statements (then-statement or else-statement) is executed. For this general form, the assembly implementation typically follows the form shown below, where we use C syntax to describe the control flow: t = t...
View Full Document

This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

Ask a homework question - tutors are online