System: Linux columbia 2.4.21-4.EL #1 Fri Oct 3 18:13:58 EDT 2003 i686 i686 i386
GNU/Linux
Architecture: i686
$ gcc -v
Reading specs from /home/pkpras/usr/local/lib/gcc/i686-pc-linux-gnu/3.4.2/specs
Configured with: ./configure --prefix=/home/pkpras/usr/local
Thread model: posix
gcc version 3.4.2
Below I am just showing the contents of two C++ files. I will be attaching *.i*
files later.
$ cat s1.cpp
#include <functional>
template <typename Op>
inline bool ff(Op op, int x)
{
return op(x);
}
int f(int x)
{
if (ff(std::bind2nd(std::equal_to<int>(), 10), x))
return 0;
else
return 1;
}
$ cat s2.cpp
int f(int x)
{
if (x == 10)
return 0;
else
return 1;
}
The command line used for compiling the two files are as follows:
$ gcc -S -O3 s1.cpp
$ gcc -S -O3 s2.cpp
The file s1.s has more code than s2.s. Below is the diff:
$ diff s1.s s2.s
1c1
< .file "s1.cpp"
---
> .file "s2.cpp"
8,9c8
< .LFB86:
< .L3:
---
> .LFB2:
11a11
> xorl %eax, %eax
14,23c14,15
< subl $16, %esp
< .LCFI2:
< movl $10, -4(%ebp)
< movl -8(%ebp), %eax
< movl -4(%ebp), %ecx
< movl 8(%ebp), %edx
< movl %eax, -16(%ebp)
< movl %ecx, -12(%ebp)
< cmpl -12(%ebp), %edx
< leave
---
> cmpl $10, 8(%ebp)
> popl %ebp
25d16
< movzbl %al, %eax
27c18
< .LFE86:
---
> .LFE2:
It seems that bind2nd is not getting optimized adequately.
--
Summary: template inline functions not getting optimized
Product: gcc
Version: 3.4.2
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pkprasoon at gmail dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17969
