https://bugs.freedesktop.org/show_bug.cgi?id=105442
Bug ID: 105442 Summary: Hang when running nine ff lighting shader Product: Mesa Version: git Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/radeonsi Assignee: dri-devel@lists.freedesktop.org Reporter: davyaxel0@gmail.com QA Contact: dri-devel@lists.freedesktop.org
Created attachment 138005 --> https://bugs.freedesktop.org/attachment.cgi?id=138005&action=edit tgsi, llvm and asm
Any app/game running nine ff shader with lighting on hangs on my RX480 with mesa git/llvm 5.0.1
The shader works well under llvmpipe and works with mesa 17.2. sisched or not doesn't make a difference.
The shader features a loop over the lights. When the lights is the last (a constant is set to 1) the loop should stop.
The constants start at pos 32 and are then incremented by 8.
I suspect comparing the correct and the fauly generated shader that the increment happens at the beginning of the loop instead of at the end:
The faulty shader has: s_branch BB0_2 ; BF820000 v_add_f32_e32 v20, 0x41000000, v20 ; 022828FF 41000000
According to the s_branch encoding, it should do PC = PC + 4
Does that mean it is noop ? Or could it be that it jumps in the middle of the the two word following instruction ? Thus causing the constant to be interpreted as an instruction ?
It could be an llvm bug or a mesa bug, thus I'm posting here in any case.