Bug#857623: mesa-opencl-icd: openCL is broken in LLVM < v5

[Andreas Boll]

Control: reassign -1 src:llvm-toolchain-3.9 1:3.9.1-5
Control: block 848258 by -1
Control: forwarded -1 https://bugs.llvm.org/show_bug.cgi?id=30217

On Mon, Mar 13, 2017 at 05:32:40AM -0700, Ian Bruce wrote:
> Package: mesa-opencl-icd
> Version: 13.0.5-1
> Severity: important
> Tags: upstream patch
> 
> LLVM versions before v5 contain a known language bug, involving the use
> of pointers as boolean values, which makes them essentially unusable for
> openCL:
> 
> https://bugs.llvm.org/show_bug.cgi?id=30217
> 
> https://reviews.llvm.org/D29038
> 
> https://reviews.llvm.org/rL294313
> 
> For an example of the problems this causes, see here:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848258
> 
> https://developer.blender.org/T50522
> 
> a trivial test case illustrating the bug:
> 
> 
>     $ cat ptr-expr2.c
>     int ptr_expr(int *p)
>     {
>         if (!p)
>             return(0);
>         else
>             return(1);
>     }
> 
>     $ clang-3.9 -x cl -emit-llvm -S ptr-expr2.c
>     ptr-expr2.c:3:9: error: invalid argument type 'int *' to unary expression
>         if (!p)
>             ^~
>     1 error generated.
> 
>     $ clang-4.0 -x cl -emit-llvm -S ptr-expr2.c
>     ptr-expr2.c:3:9: error: invalid argument type 'int *' to unary expression
>         if (!p)
>             ^~
>     1 error generated.
> 
>     $ clang-5.0 -x cl -emit-llvm -S ptr-expr2.c
>     $ # compilation succeeds
> 
> 
> possible solutions:
> 
> - make openCL require LLVM-v5
> 
> - backport the bugfix from LLVM-v5 to earlier versions;
>   it is apparently a single line change (see LLVM link above)

Dear LLVM maintainers,

please cherry-pick r294313 for llvm-3.9 and llvm-4.0.

Thanks,
Andreas


> Until one or other of these solutions is applied, openCL in Mesa is
> effectively unusable.
> 
> 
> 
> -- System Information:
> Debian Release: 9.0
>   APT prefers testing
>   APT policy: (990, 'testing'), (500, 'stable-updates'), (500, 'unstable'), (500, 'stable')
> Architecture: amd64 (x86_64)
> 
> Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
> Locale: LANG=en_CA.utf8, LC_CTYPE=en_CA.utf8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
> 
> Versions of packages mesa-opencl-icd depends on:
> ii  libc6                            2.24-9
> ii  libclc-amdgcn                    0.2.0+git20160907-3
> ii  libclc-r600                      0.2.0+git20160907-3
> ii  libdrm-amdgpu1                   2.4.74-1
> ii  libdrm-nouveau2                  2.4.74-1
> ii  libdrm-radeon1                   2.4.74-1
> ii  libdrm2                          2.4.74-1
> ii  libelf1                          0.168-0.2
> ii  libexpat1                        2.2.0-2
> ii  libgcc1                          1:6.3.0-6
> ii  libgcrypt20                      1.7.6-1
> ii  libllvm3.9                       1:3.9.1-4
> ii  libsensors4                      1:3.4.0-3+b1
> ii  libstdc++6                       6.3.0-6
> ii  ocl-icd-libopencl1 [libopencl1]  2.2.11-1
> 
> mesa-opencl-icd recommends no packages.
> 
> mesa-opencl-icd suggests no packages.
> 
> Versions of packages xserver-xorg depends on:
> ii  x11-xkb-utils                                  7.7+3+b1
> ii  xkb-data                                       2.19-1
> ii  xserver-xorg-core                              2:1.19.2-1
> ii  xserver-xorg-input-evdev [xorg-driver-input]   1:2.10.5-1
> ii  xserver-xorg-video-radeon [xorg-driver-video]  1:7.8.0-1+b1
> 
> Versions of packages xserver-xorg recommends:
> ii  libgl1-mesa-dri  13.0.5-1
> 
> Versions of packages xserver-xorg-core depends on:
> ii  keyboard-configuration    1.160
> ii  libaudit1                 1:2.6.7-1
> ii  libbsd0                   0.8.3-1
> ii  libc6                     2.24-9
> ii  libdbus-1-3               1.10.16-1
> ii  libdrm2                   2.4.74-1
> ii  libegl1-mesa              13.0.5-1
> ii  libepoxy0                 1.3.1-2
> ii  libgbm1                   13.0.5-1
> ii  libgcrypt20               1.7.6-1
> ii  libgl1-mesa-glx [libgl1]  13.0.5-1
> ii  libpciaccess0             0.13.4-1
> ii  libpixman-1-0             0.34.0-1
> ii  libselinux1               2.6-3
> ii  libsystemd0               232-19
> ii  libudev1                  232-19
> ii  libxau6                   1:1.0.8-1
> ii  libxdmcp6                 1:1.1.2-3
> ii  libxfont2                 1:2.0.1-3
> ii  libxshmfence1             1.2-1
> ii  udev                      232-19
> ii  xserver-common            2:1.19.2-1
> 
> Versions of packages xserver-xorg-core recommends:
> ii  libgl1-mesa-dri  13.0.5-1
> ii  libpam-systemd   232-19
> 
> Versions of packages xserver-xorg-core suggests:
> ii  xfonts-100dpi    1:1.0.4+nmu1
> ii  xfonts-75dpi     1:1.0.4+nmu1
> ii  xfonts-scalable  1:1.0.3-1.1
> 
> -- no debconf information
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