Created attachment 131843 [details]
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@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@entry=0x52ca18 "q->op != OP_PHI || p->op == OP_PHI", file=file@entry=0x52c968 "../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_bb.cpp", 
    line=line@entry=219, 
    function=function@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