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: davyax...@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; BF82
v_add_f32_e32 v20, 0x4100, v20; 022828FF 4100
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.
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