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optimization/6588: throw() takes 20,000 cycles : is it expected ?
- From: Sylvain dot Pion at sophia dot inria dot fr
- To: gcc-gnats at gcc dot gnu dot org
- Cc: Sylvain dot Pion at sophia dot inria dot fr
- Date: 6 May 2002 23:35:50 -0000
- Subject: optimization/6588: throw() takes 20,000 cycles : is it expected ?
- Reply-to: Sylvain dot Pion at sophia dot inria dot fr
>Number: 6588
>Category: optimization
>Synopsis: throw() takes 20,000 cycles : is it expected ?
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: pessimizes-code
>Submitter-Id: net
>Arrival-Date: Mon May 06 16:36:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Sylvain Pion
>Release: 3.1 and 3.2
>Organization:
>Environment:
Reading specs from /u/zosma/0/prisme/spion/gcc/Linux_trunc/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs
Configured with: /u/zosma/0/prisme/spion/gcc/gcc_trunc/configure --disable-shared --disable-nls --enable-languages=c++ --prefix=/u/zosma/0/prisme/spion/gcc/Linux_trunc --with-gnu-as --with-gnu-ld --with-as=/u/zosma/0/prisme/spion/gcc/Binutils/Linux/bin/as --with-ld=/u/zosma/0/prisme/spion/gcc/Binutils/Linux/bin/ld
Thread model: single
gcc version 3.2 20020505 (experimental)
>Description:
The sequence throw/catch appears to take about 20,000 cycles
on a Pentium III. Is this expected ?
Is there a way to speed this up ?
Even if this sequence is not supposed to happen often, the
fact that it's very slow can have a visible impact on global
performance.
>How-To-Repeat:
// Compile with optimization the following code,
// It takes more than 20 seconds to execute on my
// Pentium III at 933 MHz.
int main()
{
for (int i=0; i<1000000; ++i)
{
try {
throw(0);
}
catch (...) {
}
}
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: