Incorrect code produced with inline functions & assembler

[Brian Hurt]

When compiled with -O2 -finline-functions the following code incorrectly
removes the or-with-constant code.  Removing -O2 or -finline-functions
produces code (but does not inline functions).

Compiler: egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
CPU: Celeron-400 x86 single CPU
OS: Linux 2.2.14-5.0 (Redhat 6.2 unpatched)

Further comentary:

The relevent parts of the assembler are:

/* Optimized and WRONG */
#APP
        inl %dx, %eax
        outl %eax, %dx
#NO_APP

Notice the lack of any "or".

/* Unoptimized and RIGHT */
        pushl $993
        pushl $993
        call inportl
        addl $4,%esp
        movl %eax,%eax
        movl %eax,%edx
        orl $305419896,%edx
        pushl %edx
        call outportl
        addl $8,%esp

Notice the orl.

I have not yet tried other versions of gcc.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: test.o
Type: application/x-object
Size: 735 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-bugs/attachments/20010209/8548f605/attachment.bin>