[Bug c/40795] New: gcc generates incorrect code for inline assembly

bart dot vanassche at gmail dot com gcc-bugzilla@gcc.gnu.org
Sat Jul 18 07:54:00 GMT 2009


The attached program generates the expected output when compiled and run with
any of the gcc 3.x, gcc 4.0/4.1/4.2/4.3 compilers, but not with gcc 4.4. The
details are as follows:

* gcc version and configuration (built from unmodified GNU sources):
~/gcc-4.4.0/bin/gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: /home/bart/software/gcc-4.4.0/configure --disable-linux-futex
--disable-mudflap --disable-nls --enable-languages=c,c++ --enable-threads=posix
--enable-tls --prefix=/home/bart/gcc-4.4.0
Thread model: posix
gcc version 4.4.0 (GCC)

* How to compile:
/home/bart/gcc-4.4.0/bin/gcc -g -m32 -mmmx -msse -fno-stack-protector -o
pushpopseg pushpopseg.i

* How to run:
./pushpopseg

* Expected output:
sp change after push = -2
sp change after pop = 2
fs after push and pop = 0003
sp change after push = -4
sp change after pop = 4
fs after push and pop = 0003

* Output with gcc 4.4.0 (not correct):
sp change after push = 141379319
sp change after pop = -141379319
fs after push and pop = 0003
sp change after push = 141379319
sp change after pop = -141379319
fs after push and pop = 0003


-- 
           Summary: gcc generates incorrect code for inline assembly
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bart dot vanassche at gmail dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40795



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