OpenForum RSS: �� inline-�� Gprof ?

�� inline-�� Gprof ? (skb7)

Thu, 13 Nov 2014 10:23:07 GMT

> static inline int f1(int a) __attribute__((always_inline));
> static inline int f2(int a) __attribute__((always_inline));

� �� , �� , �� ӣ �� . �� , �� static, � �� always_inline. always_inline �� . �� -- �� flatten. � �� . �� #define �� :)

�� https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Function-Attributes.html :
[code]
always_inline
Generally, functions are not inlined unless optimization is specified. For functions declared inline, this attribute inlines the function even if no optimization level was specified.

flatten
Generally, inlining into a function is limited. For a function marked with this attribute, every call inside this function will be inlined, if possible. Whether the function itself is considered for inlining depends on its size and t

�� inline-�� Gprof ? (pavlinux)

Thu, 13 Nov 2014 00:52:05 GMT

> �� , �� , �� .
> �� , �� /��
> �� , �� , �� .

�� , � �� .

�� inline-�� Gprof ? (pavlinux)

Thu, 13 Nov 2014 00:45:20 GMT

> �� .

�� , �� , � ��? :)

�� inline-�� Gprof ? (pavlinux)

Thu, 13 Nov 2014 00:38:43 GMT

>[�� ]

[code]
#include <stdio.h>
#include <stdlib.h>

static inline int f1(int a) __attribute__((always_inline));
static inline int f2(int a) __attribute__((always_inline));

static inline int f1(int a)
{
return a + 1;
}

static inline int f2(int a)
{
int i;

for (i = 0; i < 10; ++i) {
if (a < 5)
a += 2;
else
a += 3;
}

printf("f2 done\n");

return a;
}

int main(void)
{
int x = 5;

x = f1(x);
x = f2(x);

printf("x = %d\n", x);

return EXIT_SUCCESS;
}
[/code]
> �� , � �� :
> [code]
> $ gcc -Wall -O2 main.c
> $ objdump -DCS a.out | less
> [/code]
> �� :

[code]
0000000000400546 <main>:
400546: 55 push %rbp
400547: 48 89 e5 mov %rsp,%rbp

�� inline-�� Gprof ? (xintrea)

Wed, 12 Nov 2014 20:16:34 GMT

>[�� ]
> }
> [/code]
> 2. � ��, �� , ��
> :)
> [code]
> inline unsigned char RC5Simple::RC5_GetByteFromWord(RC5_TWORD w, int n)
> {
> return (w >> (n*8)) & 0xff;
> }
> [/code]

��, �� , �� . �� . �� .

�� , �� .

�� inline-�� Gprof ? (skb7)

Wed, 12 Nov 2014 15:50:47 GMT

� �� :) �� RC5_GetByteFromWord().
1. �� :
[code]
inline unsigned char RC5Simple::RC5_GetByteFromWord(RC5_TWORD w, int n)
{
switch (n) {
case 0:
return w & 0x000000FF;
case 1:
return (w & 0x0000FF00) >> 8;
case 2:
return (w & 0x00FF0000) >> 16;
case 3:
return (w & 0xFF000000) >> 24;
default:
return 0;
}
[/code]
2. � ��, �� , �� :)
[code]
inline unsigned char RC5Simple::RC5_GetByteFromWord(RC5_TWORD w, int n)
{
return (w >> (n*8)) & 0xff;
}
[/code]

�� , � �� , ��:
[code]
#define GET_BYTE(w, n) ((w) >> ((n)*8) & 0xff)
[/code]

�� , �� .

�� inline-�� Gprof ? (skb7)

Wed, 12 Nov 2014 15:28:13 GMT

�� C++, �� C "inline" -- �� [b]��[/b] �� . �� (�� 1-2 ��). �� , �� , -- �� (#define). �� attribute((always_inline)) �� , �� inline (�� ) �� (-O0).

�� http://en.wikipedia.org/wiki/Inline_function :
[code]
The compiler may ignore the programmer’s attempt to inline a function, mainly if it is particularly large.
[/code]

�� :
[code]
#include <stdio.h>
#include <stdlib.h>

inline int f1(int a)
{
return a + 1;
}

inline int f2(int a)
{
int i;

for (i = 0; i < 10; ++i) {
if (a < 5)
a += 2;
else
a += 3;
}

printf("f2 done\n");

return a;
}

int main(void)
{
int x = 5;

x = f1(x);
x = f2(x);

printf("x = %d\n", x);

return EXIT_SUCCESS;
}
[/code]

�

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������ �� ���� ����� � inline-������� � ����������� Gprof ? (skb7)

������ �� ���� ����� � inline-������� � ����������� Gprof ? (pavlinux)

������ �� ���� ����� � inline-������� � ����������� Gprof ? (pavlinux)

������ �� ���� ����� � inline-������� � ����������� Gprof ? (pavlinux)

������ �� ���� ����� � inline-������� � ����������� Gprof ? (xintrea)

������ �� ���� ����� � inline-������� � ����������� Gprof ? (skb7)

������ �� ���� ����� � inline-������� � ����������� Gprof ? (skb7)

OpenForum RSS: �� inline-�� Gprof ?

�� inline-�� Gprof ? (skb7)

�� inline-�� Gprof ? (pavlinux)

�� inline-�� Gprof ? (pavlinux)

�� inline-�� Gprof ? (pavlinux)

�� inline-�� Gprof ? (xintrea)

�� inline-�� Gprof ? (skb7)

�� inline-�� Gprof ? (skb7)