GEM - GNU C Compiler Extensions Framework
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GCC is a widely used open source compiler. It consists of frontends for languages like C and C++ and backends that generate code for different CPU architectures. The GCC Extensibility Made Easy (GEM) framework allows dynamically loading modules to extend GCC functionality. Examples include adding new language features, improving security, and facilitating operating system development.
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20145-5SumII_CSC407_assign1.htmlCSC 407 Computer Systems II.docx
20145-5SumII_CSC407_assign1.html
CSC 407: Computer Systems II: 2015 Summer II, Assignment #1
Last Modified 2015 July 21Purpose:
To go over issues related to how the compiler and the linker
serve you, the programmer.
Computing
Please ssh into ctilinux1.cstcis.cti.depaul.edu, or use your own Linux machine.
Compiler optimization (45 Points)
Consider the following program.
/* q1.c
*/
#include <stdlib.h>
#include <stdio.h>
#define unsigned int uint
#define LENGTH ((uint) 512*64)
int initializeArray (uint len,
int* intArray
)
{
uint i;
for (i = 0; i < len; i++)
intArray[i] = (rand() % 64);
}
uint countAdjacent (int maxIndex,
int* intArray,
int direction
)
{
uint i;
uint sum = 0;
for (i = 0; i < maxIndex; i++)
if ( ( intArray[i] == (intArray[i+1] + direction) ) &&
( intArray[i] == (intArray[i+2] + 2*direction) )
)
sum++;
return(sum);
}
uint funkyFunction (uint len,
int* intArray
)
{
uint i;
uint sum = 0;
for (i = 0; i < len-1; i++)
if ( (i % 8) == 0x3 )
sum += 7*countAdjacent(len-2,intArray,+1);
else
sum += 17*countAdjacent(len-2,intArray,-1);
return(sum);
}
int main ()
{
int* intArray = (int*)calloc(LENGTH,sizeof(int));
initializeArray(LENGTH,intArray);
printf("funkyFunction() == %d\n",funkyFunction(LENGTH,intArray));
free(intArray);
return(EXIT_SUCCESS);
}
(8 Points) Compile it for profiling but with no extra optimization with:
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$ ./q1None # Runs q1None
$ gprof q1None # Gives profile info on q1None
Be sure to scroll all the way to the top of gprof output!
What are the number of self seconds taken by:
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(8 Points)
How did it do the operation (i % 8) == 0x3?
Was it done as a modulus (the same as an expensive division, but returns the remainder instead of the quotient) or something else?
Show the assembly language for this C code
using gdb to dissassemble
funkyFunction() of q1None.
Hint: do:
$ gdb q1None
. . .
(gdb) disass funkyFunction
Dump of assembler code for function funkyFunction:
. . .
and then look for the code that sets up the calls to countAdjacent().
The (i % 8) == 0x3 test is done before either countAdjacent() call.
(8 Points) Compile it for profiling but with optimization with:
$ gcc -o q1Compiler -O1 -pg q1.c # Compiles q1.c to write q1Compiler to make profile info
$ ./q1Compiler # Runs q1Compiler
$ gprof q1Compiler # Gives profile info on q1Compiler
What are the number of self seconds taken by:
FunctionSelf secondsinitializeBigArray()__________countAdjacent()__________funkyFunction()__________(8 Points) Use gdb to dissassemble countAdjacent() of both q1None and q1.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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