Andrew Pinski - Re: insufficient inline optimisation? (original) (raw)

This is the mail archive of the gcc@gcc.gnu.orgmailing list for the GCC project.

• From: Andrew Pinski
• To: als at iinet dot net dot au (Anthony Shipman)
• Cc: gcc at gcc dot gnu dot org
• Date: Tue, 1 Nov 2005 09:25:45 -0500 (EST)
• Subject: Re: insufficient inline optimisation?

The compiler version is 4.01 (on Fedora 4). If I compile with -O0 then the creation of buf results in a loop being generated which calls the Z() constructor 100 times.

But then if I compile with -O the constructor will be inlined. The generated machine code contains a loop which does nothing 100 times: movl $100, %eax .L11: decl %eax jne .L11

I think that the optimiser should get rid of the loop once it has got rid of the body!

Should I submit this as a bug?

This has been fixed in 4.1.0 already. This is the normal not removing empty loops problem which was fixed in 4.1.0.

-- Pinski

• References:
  • insufficient inline optimisation?
    * From: Anthony Shipman