Nouveau - Jun 2017 - [Bug 101371] New: GlobalCSE Pass moves phi instructions

https://bugs.freedesktop.org/show_bug.cgi?id=101371

            Bug ID: 101371
           Summary: GlobalCSE Pass moves phi instructions
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: karolherbst at gmail.com
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 131843
  --> https://bugs.freedesktop.org/attachment.cgi?id=131843&action=edit
frag.tgsi

In the game "Renowned Explorers: International Society" an assertion
was hit
within codegen, because GlobalCSE wanted to move a phi instruction after a join
instruction, which is illegal.

backtrace:
#0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1  0x00007ffff676d54a in __GI_abort () at abort.c:89
#2  0x00007ffff6764eb7 in __assert_fail_base (fmt=<optimized out>,
assertion=assertion at entry=0x52ca18 "q->op != OP_PHI || p->op ==
OP_PHI",
file=file at entry=0x52c968
"../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp", 
    line=line at entry=219, 
    function=function at entry=0x52ce80
<nv50_ir::BasicBlock::insertAfter(nv50_ir::Instruction*,
nv50_ir::Instruction*)::__PRETTY_FUNCTION__> "void
nv50_ir::BasicBlock::insertAfter(nv50_ir::Instruction*,
nv50_ir::Instruction*)")
    at assert.c:92
#3  0x00007ffff6764f62 in __GI___assert_fail (assertion=0x52ca18 "q->op
!OP_PHI || p->op == OP_PHI", file=0x52c968
"../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp",
line=219,
    function=0x52ce80
<nv50_ir::BasicBlock::insertAfter(nv50_ir::Instruction*,
nv50_ir::Instruction*)::__PRETTY_FUNCTION__> "void
nv50_ir::BasicBlock::insertAfter(nv50_ir::Instruction*,
nv50_ir::Instruction*)") at assert.c:101
#4  0x000000000041f0a0 in nv50_ir::BasicBlock::insertAfter (this=0x82fd10,
p=0x818ca0, q=0x81d0c0) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp:219
#5  0x00000000004554c0 in nv50_ir::GlobalCSE::visit (this=0x7ffffffe7b70,
bb=0x82fd10) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp:3466
#6  0x00000000004200fd in nv50_ir::Pass::doRun (this=0x7ffffffe7b70,
func=0x7bc1a0, ordered=false, skipPhi=false) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp:495
#7  0x000000000041ff05 in nv50_ir::Pass::doRun (this=0x7ffffffe7b70,
prog=0x7bc000, ordered=false, skipPhi=false) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp:466
#8  0x000000000041fe60 in nv50_ir::Pass::run (this=0x7ffffffe7b70,
prog=0x7bc000, ordered=false, skipPhi=false) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp:457
#9  0x00000000004561ed in nv50_ir::Program::optimizeSSA (this=0x7bc000,
level=3) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp:3725
#10 0x0000000000416adf in nv50_ir_generate_code (info=0x7ffffffe87e0) at
../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir.cpp:1256
#11 0x0000000000402e33 in nouveau_codegen (chipset=230, type=1,
tokens=0x7fffffff9420, size=0x7ffffffe941c, code=0x7ffffffe9410) at
../../../../../src/gallium/drivers/nouveau/nouveau_compiler.c:126
#12 0x0000000000403210 in main (argc=4, argv=0x7fffffffd528) at
../../../../../src/gallium/drivers/nouveau/nouveau_compiler.c:206

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https://bugs.freedesktop.org/show_bug.cgi?id=101371

GitLab Migration User <gitlab-migration at fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #1 from GitLab Migration User <gitlab-migration at
fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1135.

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