[Bug c/63402] New: ICE when using log10l() with -m96bit-long-double

[Bug c/63402] New: ICE when using log10l() with -m96bit-long-double

[vz-gcc at zeitlins dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63402

            Bug ID: 63402
           Summary: ICE when using log10l() with -m96bit-long-double
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vz-gcc at zeitlins dot org

Created attachment 33603
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33603&action=edit
Preprocessed source corresponding to the code provoking the error

% gcc -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.1-15'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.1 (Debian 4.9.1-15)
% cat tmp.c
#include <math.h>

void func()
{
    log10l(0);
}
% gcc -m96bit-long-double -c tmp.c
tmp.c: In function 'func':
tmp.c:6:1: error: unable to generate reloads for:
 }
 ^
(insn 6 5 7 2 (set (mem:XF (pre_modify:DI (reg/f:DI 7 sp)
                (plus:DI (reg/f:DI 7 sp)
                    (const_int -16 [0xfffffffffffffff0]))) [0  S12 A32])
        (reg:XF 83)) tmp.c:5 122 {*pushxf}
     (expr_list:REG_DEAD (reg:XF 83)
        (expr_list:REG_ARGS_SIZE (const_int 16 [0x10])
            (nil))))
tmp.c:6:1: internal compiler error: in curr_insn_transform, at
lra-constraints.c:3362
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions.
Preprocessed source stored into /tmp/cckAwyLN.out file, please attach this to
your bugreport.

4.8.3 compiles the same code without any problems.

[Bug target/63402] ICE when using log10l() with -m96bit-long-double

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63402

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=100041
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Since r12-94 (PR100041 fix), -m96bit-long-double is rejected for this target.


Note the ICE was fixed in GCC 6.4 and 7+ too.