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authorHeiko Przybyl <[email protected]>2016-11-20 14:42:28 +0100
committerMarek Olšák <[email protected]>2017-01-03 21:58:52 +0100
commite933246013eef376804662f3fcf4646c143c6c88 (patch)
tree439f8733ab9bc846b3ee7ea6f303e7fe142735b2 /src/compiler/nir/nir_loop_analyze.c
parentdd12119706c00a9c10eafa4af09f44207793c064 (diff)
r600/sb: Fix loop optimization related hangs on eg
Make sure unused ops and their references are removed, prior to entering the GCM (global code motion) pass, to stop GCM from breaking the loop logic and thus hanging the GPU. Turns out, that sb has problems with loops and node optimizations regarding associative folding: - the global code motion (gcm) pass moves ops up a loop level/basic block until they've fulfilled their total usage count - if there are ops folded into others, the usage count won't be fulfilled and thus the op moved way up to the top - within GCM the op would be visited and their deps would be moved alongside it, to fulfill the src constaints - in a loop, an unused op is moved out of the loop and GCM would move the src value ops up as well - now here arises the problem: if the loop counter is one of the src values it would get moved up as well, the loop break condition would never get hit and the shader turn into an endless loop, resulting in the GPU hanging and being reset A reduced (albeit nonsense) piglit example would be: [require] GLSL >= 1.20 [fragment shader] uniform int SIZE; uniform vec4 lights[512]; void main() { float x = 0; for(int i = 0; i < SIZE; i++) x += lights[2*i+1].x; } [test] uniform int SIZE 1 draw rect -1 -1 2 2 Which gets optimized to: ===== SHADER #12 OPT ================================== PS/BARTS/EVERGREEN ===== ===== 42 dw ===== 1 gprs ===== 2 stack ========================================= ALU 3 @24 1 y: MOV R0.y, 0 t: MULLO_UINT R0.w, [0x00000002 2.8026e-45].x, R0.z LOOP_START_DX10 @22 PUSH @6 ALU 1 @30 KC0[CB0:0-15] 2 M x: PRED_SETGE_INT __.x, R0.z, KC0[0].x JUMP @14 POP:1 LOOP_BREAK @20 POP @14 POP:1 ALU 2 @32 3 x: ADD_INT R0.x, R0.w, [0x00000002 2.8026e-45].x TEX 1 @36 VFETCH R0.x___, R0.x, RID:0 MFC:16 UCF:0 FMT[..] ALU 1 @40 4 y: ADD R0.y, R0.y, R0.x LOOP_END @4 EXPORT_DONE PIXEL 0 R0.____ EOP ===== SHADER_END =============================================================== Notice R0.z being the loop counter/break condition relevant register and being never incremented at all. Also some of the loop content has been moved out of it, to fulfill the requirements for the one unused op. With a debug build of mesa this would produce an error like error at : PRED_SETGE_INT __, __, EM.2, R1.x.2||[email protected], C0.x : operand value R1.x.2||[email protected] was not previously written to its gpr and the compilation would fail due to this. On a release build it gets passed to the GPU. When using this patch, the loop remains intact: ===== SHADER #12 OPT ================================== PS/BARTS/EVERGREEN ===== ===== 48 dw ===== 1 gprs ===== 2 stack ========================================= ALU 2 @24 1 y: MOV R0.y, 0 z: MOV R0.z, 0 LOOP_START_DX10 @22 PUSH @6 ALU 1 @28 KC0[CB0:0-15] 2 M x: PRED_SETGE_INT __.x, R0.z, KC0[0].x JUMP @14 POP:1 LOOP_BREAK @20 POP @14 POP:1 ALU 4 @30 3 t: MULLO_UINT T0.x, [0x00000002 2.8026e-45].x, R0.z 4 x: ADD_INT R0.x, T0.x, [0x00000002 2.8026e-45].x TEX 1 @40 VFETCH R0.x___, R0.x, RID:0 MFC:16 UCF:0 FMT[..] ALU 2 @44 5 y: ADD R0.y, R0.y, R0.x z: ADD_INT R0.z, R0.z, 1 LOOP_END @4 EXPORT_DONE PIXEL 0 R0.____ EOP ===== SHADER_END =============================================================== Piglit: ./piglit summary console -d results/*_gpu_noglx name: unpatched_gpu_noglx patched_gpu_noglx ---- ------------------- ----------------- pass: 18016 18021 fail: 748 743 crash: 7 7 skip: 1124 1124 timeout: 0 0 warn: 13 13 incomplete: 0 0 dmesg-warn: 0 0 dmesg-fail: 0 0 changes: 0 5 fixes: 0 5 regressions: 0 0 total: 19908 19908 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94900 Tested-by: Heiko Przybyl <[email protected]> Tested-on: Barts PRO HD6850 Signed-off-by: Heiko Przybyl <[email protected]> Signed-off-by: Marek Olšák <[email protected]>
Diffstat (limited to 'src/compiler/nir/nir_loop_analyze.c')
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