[Mesa-dev] [Bug 85799] segfault since glsl: Drop constant 0.0 components from dot products

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85799

            Bug ID: 85799
           Summary: segfault since glsl: Drop constant 0.0 components from
                    dot products
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: adf.lists at gmail.com

Running radeonsi with git llvm.

Unreal Elemental demo is segfaulting for me since 

d056863b3c535aeebfe5fcfc9468eb33a06ddb60 is the first bad commit
commit d056863b3c535aeebfe5fcfc9468eb33a06ddb60
Author: Matt Turner <mattst88 at gmail.com>
Date:   Fri Oct 17 20:32:58 2014 -0700

    glsl: Drop constant 0.0 components from dot products.

    Helps a small number of vertex shaders in the games Dungeon Defenders
    and Shank, as well as an internal benchmark.

    instructions in affected programs:     2801 -> 2719 (-2.93%)



Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffed2d3700 (LWP 20246)]
0x00007ffff1687717 in emit_dp (elements=<optimized out>, src1=..., src0=...,
dst=..., ir=0x7fffc874a238, this=0x7fffc86196c0) at
../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:721
721        return emit(ir, dot_opcodes[elements - 2], dst, src0, src1);
(gdb) bt
#0  0x00007ffff1687717 in emit_dp (elements=<optimized out>, src1=...,
src0=..., dst=..., ir=0x7fffc874a238, this=0x7fffc86196c0) at
../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:721
#1  glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0, ir=0x7fffc874a238) at
../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1755
#2  0x00007ffff16857e9 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc874a798) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1315
#3  0x00007ffff16857e9 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc86d4d38) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1315
#4  0x00007ffff16857e9 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc86d4db8) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1315
#5  0x00007ffff16857e9 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc8601da8) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1315
#6  0x00007ffff16857e9 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc86022f8) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1315
#7  0x00007ffff16857e9 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc8602848) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1315
#8  0x00007ffff168e1d3 in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=0x7fffc8602988) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:2405
#9  0x00007ffff167d8bc in glsl_to_tgsi_visitor::visit (this=0x7fffc86196c0,
ir=<optimized out>) at ../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:1193
#10 0x00007ffff171ae55 in visit_exec_list (list=<optimized out>,
visitor=visitor at entry=0x7fffc86196c0) at ../../src/glsl/ir.cpp:1792
#11 0x00007ffff1698bf4 in get_mesa_program (shader=0x7fffc8653c98,
shader_program=0x7fffc86dd5d8, ctx=0x4a8fc00) at
../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:5225
#12 st_link_shader (ctx=0x4a8fc00, prog=0x7fffc86dd5d8) at
../../src/mesa/state_tracker/st_glsl_to_tgsi.cpp:5431
#13 0x00007ffff16ad686 in _mesa_glsl_link_shader (ctx=0x4a8fc00,
prog=0x7fffc86dd5d8) at ../../src/mesa/program/ir_to_mesa.cpp:3038
#14 0x00007ffff15ff14a in link_program (ctx=0x4a8fc00, program=<optimized out>)
at ../../src/mesa/main/shaderapi.c:917

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