[Bug 90629] [i965] SIMD16 dual_source_blend assertion `src[i].file != GRF || src[i].width == dst.width' failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90629

            Bug ID: 90629
           Summary: [i965] SIMD16 dual_source_blend assertion `src[i].file
                    != GRF || src[i].width == dst.width' failed
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: wickmarkus at web.de
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 116025
  --> https://bugs.freedesktop.org/attachment.cgi?id=116025&action=edit
apitrace dump to reproduce this issue

Hi,

I get an assert on my IVB with mesa-master since this commit:
i965/fs: Implement integer multiply without mul/mach.

The assert is:
brw_fs.cpp:346: fs_inst* fs_visitor::LOAD_PAYLOAD(const fs_reg&, fs_reg*, int,
int): Assertion `src[i].file != GRF || src[i].width == dst.width' failed.

mattst88> I'm thinking that enabling SIMD16 in this shader allows us to see a
bug in a different area of the code we couldn't hit before :)
mattst88> it's related to dual-source blending, which I guess isn't a very
common feature

To reproduce this issue, I've attached an apitrace dump here at this report.

gdb bt:
#0  0x00007ffff6865528 in raise () from /usr/lib/libc.so.6
#1  0x00007ffff686693a in abort () from /usr/lib/libc.so.6
#2  0x00007ffff685e3a7 in __assert_fail_base () from /usr/lib/libc.so.6
#3  0x00007ffff685e452 in __assert_fail () from /usr/lib/libc.so.6
#4  0x00007ffff314d603 in fs_visitor::LOAD_PAYLOAD
(this=this at entry=0x7fffffffd020, dst=..., src=src at entry=0x1af8c10,
sources=sources at entry=11, 
    header_size=header_size at entry=2) at brw_fs.cpp:346
#5  0x00007ffff319b732 in fs_visitor::emit_single_fb_write
(this=this at entry=0x7fffffffd020, color0=..., color1=..., src0_alpha=...,
components=components at entry=4, 
    exec_size=exec_size at entry=8, use_2nd_half=use_2nd_half at entry=false) at
brw_fs_visitor.cpp:3730
#6  0x00007ffff319c14a in fs_visitor::emit_fb_writes
(this=this at entry=0x7fffffffd020) at brw_fs_visitor.cpp:3772
#7  0x00007ffff315ba98 in fs_visitor::run_fs (this=this at entry=0x7fffffffd020)
at brw_fs.cpp:4344
#8  0x00007ffff315c34c in brw_wm_fs_emit (brw=brw at entry=0x7ffff7fd2040,
mem_ctx=mem_ctx at entry=0x1ad15d0, key=key at entry=0x7fffffffe1d0, 
    prog_data=prog_data at entry=0x7fffffffe040, fp=fp at entry=0x1aaaf90,
prog=prog at entry=0x1abde90, final_assembly_size=0x7fffffffe03c) at
brw_fs.cpp:4473
#9  0x00007ffff31de4bf in brw_codegen_wm_prog (brw=0x7ffff7fd2040,
prog=0x1abde90, fp=0x1aaaf90, key=0x7fffffffe1d0) at brw_wm.c:213
#10 0x00007ffff315ab8f in brw_fs_precompile (ctx=0x7ffff7fd2040,
shader_prog=0x1abde90, prog=0x1aaaf90) at brw_fs.cpp:4579
#11 0x00007ffff31b6210 in brw_shader_precompile (sh_prog=0x1abde90,
ctx=0x7ffff7fd2040) at brw_shader.cpp:78
#12 brw_link_shader (ctx=0x7ffff7fd2040, shProg=0x1abde90) at
brw_shader.cpp:320
#13 0x00007ffff2ff6552 in _mesa_glsl_link_shader (ctx=0x7ffff7fd2040,
prog=0x1abde90) at program/ir_to_mesa.cpp:2964
#14 0x00007ffff2f0217a in link_program (ctx=0x7ffff7fd2040, program=<optimized
out>) at main/shaderapi.c:946

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