[Mesa-dev] [Bug 82477] New: [softpipe] piglit fp-long-alu regression

Mon Aug 11 14:19:54 PDT 2014

https://bugs.freedesktop.org/show_bug.cgi?id=82477

          Priority: medium
            Bug ID: 82477
          Keywords: bisected, have-backtrace, regression
                CC: eric at anholt.net, kenneth at whitecape.org
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: [softpipe] piglit fp-long-alu regression
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: vlee at freedesktop.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Mesa core
           Product: Mesa

mesa: f24be7340162c6a831b392d46d6637e9656e7a8a (master 10.3.0-devel)

$ ./bin/fp-long-alu -auto
Max (native) ALU instructions: 2147483647
Testing: alu_depth = 1
Testing: alu_depth = 2
Testing: alu_depth = 3
Testing: alu_depth = 4
Testing: alu_depth = 5
Testing: alu_depth = 6
Testing: alu_depth = 7
Testing: alu_depth = 8
Testing: alu_depth = 11
Testing: alu_depth = 17
Testing: alu_depth = 29
Testing: alu_depth = 53
Testing: alu_depth = 101
Testing: alu_depth = 197
Testing: alu_depth = 389
Testing: alu_depth = 773
Testing: alu_depth = 1541
tgsi/tgsi_exec.c:762:tgsi_exec_machine_bind_shader: Assertion `mach->ImmLimit +
1 <= 256' failed.
Trace/breakpoint trap (core dumped)

(gdb) bt
#0  0x00007fa5d3012ac6 in _debug_assert_fail (expr=expr at entry=0x7fa5d312f80a
"mach->ImmLimit + 1 <= 256", file=file at entry=0x7fa5d312f58f "tgsi/tgsi_exec.c", 
    line=line at entry=762, function=function at entry=0x7fa5d312ff60 <__func__.7069>
"tgsi_exec_machine_bind_shader") at util/u_debug.c:309
#1  0x00007fa5d3003e25 in tgsi_exec_machine_bind_shader (mach=0x7fa5d11e7010,
tokens=<optimized out>, sampler=<optimized out>) at tgsi/tgsi_exec.c:762
#2  0x00007fa5d30854bd in update_fragment_shader (prim=4, softpipe=0x178bb10)
at sp_state_derived.c:274
#3  softpipe_update_derived (softpipe=softpipe at entry=0x178bb10, prim=4) at
sp_state_derived.c:376
#4  0x00007fa5d3079c58 in softpipe_draw_vbo (pipe=0x178bb10,
info=0x7fff56d3c220) at sp_draw_arrays.c:79
#5  0x00007fa5d2ee24e2 in st_draw_vbo (ctx=<optimized out>, prims=<optimized
out>, nr_prims=<optimized out>, ib=0x0, index_bounds_valid=<optimized out>,
min_index=0, 
    max_index=3, tfb_vertcount=0x0, indirect=0x0) at
../../src/mesa/state_tracker/st_draw.c:285
#6  0x00007fa5d2eafa4f in vbo_draw_arrays (ctx=0x7fa5d893e010, mode=5, start=0,
count=4, numInstances=1, baseInstance=0) at
../../src/mesa/vbo/vbo_exec_array.c:667
#7  0x00007fa5d84ae3eb in piglit_draw_rect_from_arrays (verts=0x7fff56d3c3a0,
tex=0x0) at piglit/tests/util/piglit-util-gl.c:691
#8  0x00007fa5d84ae75d in piglit_draw_rect (x=0, y=0, w=32, h=32) at
piglit/tests/util/piglit-util-gl.c:795
#9  0x00000000004014de in test (alu_depth=1541) at
piglit/tests/shaders/fp-long-alu.c:117
#10 0x00000000004017b8 in piglit_display () at
piglit/tests/shaders/fp-long-alu.c:160
#11 0x00007fa5d84cf24e in display () at
piglit/tests/util/piglit-framework-gl/piglit_glut_framework.c:60
#12 0x00007fa5d7bd9244 in fghRedrawWindow (window=0x1774ba0) at
freeglut_main.c:231
#13 fghcbDisplayWindow (window=0x1774ba0, enumerator=0x7fff56d3c5c0) at
freeglut_main.c:248
#14 0x00007fa5d7bdcaa9 in fgEnumWindows
(enumCallback=enumCallback at entry=0x7fa5d7bd91d0 <fghcbDisplayWindow>,
enumerator=enumerator at entry=0x7fff56d3c5c0)
    at freeglut_structure.c:396
#15 0x00007fa5d7bd97fd in fghDisplayAll () at freeglut_main.c:271
#16 glutMainLoopEvent () at freeglut_main.c:1523
#17 0x00007fa5d7bd9ffd in glutMainLoop () at freeglut_main.c:1571
#18 0x00007fa5d84cf58a in run_test (gl_fw=0x7fa5d8741080 <glut_fw>, argc=1,
argv=0x7fff56d3c998)
    at piglit/tests/util/piglit-framework-gl/piglit_glut_framework.c:167
#19 0x00007fa5d84b6236 in piglit_gl_test_run (argc=1, argv=0x7fff56d3c998,
config=0x7fff56d3c860) at piglit/tests/util/piglit-framework-gl.c:151
#20 0x0000000000401155 in main (argc=1, argv=0x7fff56d3c998) at
piglit/tests/shaders/fp-long-alu.c:45
(gdb) frame 1
#1  0x00007fa5d3003e25 in tgsi_exec_machine_bind_shader (mach=0x7fa5d11e7010,
tokens=<optimized out>, sampler=<optimized out>) at tgsi/tgsi_exec.c:762
762                assert( mach->ImmLimit + 1 <= TGSI_EXEC_NUM_IMMEDIATES );
(gdb) print mach->ImmLimit
$1 = 256

f82f2fb3dc770902f1657ab1c22e6004faa3afab is the first bad commit
commit f82f2fb3dc770902f1657ab1c22e6004faa3afab
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sat Aug 2 05:33:14 2014 -0700

    mesa: Actually use the Mesa IR optimizer for ARB programs.

    On Haswell, this cuts 1-3 instructions from 183 vertex shaders in
    "Shadowrun Returns", "Shatter", and "Trine 2."  It adds 2 instructions
    to a single fragment shader in "Closure."

    total instructions in shared programs: 278803 -> 278546 (-0.09%)
    instructions in affected programs:     41930 -> 41673 (-0.61%)

    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Eric Anholt <eric at anholt.net>

:040000 040000 e36b3a25abfddfcd79865f73c885f3bd89af034b
9a18c67434a461b0d09cb3c6487f9606cd8786b8 M    src
bisect run success

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