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 libc62.24-9
> ii libclc-amdgcn0.2.0+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 libexpat12.2.0-2
> 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-configuration1.160
> 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-common2:1.19.2-1
>
> 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-100dpi1:1.0.4+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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