[Nouveau] [Bug 78161] [NV96] Artifacts in output of fragment program containing not unrolled loops with conditional break

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78161

--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
The relevant TGSI shader:

FRAG
PROPERTY FS_COLOR0_WRITES_ALL_CBUFS 1
DCL IN[0], GENERIC[20], PERSPECTIVE
DCL OUT[0], COLOR
DCL CONST[0]
DCL TEMP[0..13], LOCAL
IMM[0] FLT32 {    1.0000,     0.0000,   200.0000, 234895.7188}
IMM[1] FLT32 {  231.0000,    33.0000,     1.1000,     0.9800}
IMM[2] FLT32 {    0.0050,     0.1000,     0.0000,     0.0000}
  0: MOV TEMP[0], IMM[0].xxxx
  1: MOV TEMP[1].xy, IN[0].xyxx
  2: MOV TEMP[2].x, IMM[0].yyyy
  3: BGNLOOP :0
  4:   FSGE TEMP[3].x, TEMP[2].xxxx, IMM[0].zzzz
  5:   UIF TEMP[3].xxxx :0
  6:     BRK
  7:   ENDIF
  8:   FSLT TEMP[4].x, CONST[0].xxxx, TEMP[2].xxxx
  9:   UIF TEMP[4].xxxx :0
 10:     BRK
 11:   ENDIF
 12:   MUL TEMP[5].x, TEMP[1].xxxx, IMM[1].xxxx
 13:   ADD TEMP[6].x, TEMP[2].xxxx, IMM[1].yyyy
 14:   MUL TEMP[7].x, TEMP[5].xxxx, TEMP[6].xxxx
 15:   MAD TEMP[8].x, TEMP[1].yyyy, IMM[0].wwww, TEMP[7].xxxx
 16:   ADD TEMP[9].x, TEMP[2].xxxx, IMM[1].zzzz
 17:   MUL TEMP[10].x, TEMP[8].xxxx, TEMP[9].xxxx
 18:   COS TEMP[11].x, TEMP[10].xxxx
 19:   FSLT TEMP[12].x, IMM[1].wwww, TEMP[11].xxxx
 20:   UIF TEMP[12].xxxx :0
 21:     MOV TEMP[0].xyw, IMM[0].yyyx
 22:     MUL TEMP[13].x, TEMP[2].xxxx, IMM[2].xxxx
 23:     MOV TEMP[0].z, TEMP[13].xxxx
 24:     BRK
 25:   ENDIF
 26:   ADD TEMP[2].x, TEMP[2].xxxx, IMM[0].xxxx
 27: ENDLOOP :0
 28: ADD TEMP[0].x, TEMP[0].xxxx, IMM[2].yyyy
 29: MOV OUT[0], TEMP[0]
 30: END

and the envydis output of the generated shader (on my G96, with ~mesa-git):

00000000: 80000000              interp $r0 v[0x0]
00000004: 90000000              rcp f32 $r0 $r0
00000008: 1000800d 03f80003     mov b32 $r3 0x3f800000
00000010: 82010004              interp $r1 v[0x4] $r0
00000014: 82020000              interp $r0 v[0x8] $r0
00000018: 10008009 00000003     mov b32 $r2 0x0
00000020: 40024003 00000000     breakaddr 0x120
00000028: 10008011 04348003   B mov b32 $r4 0x43480000
00000030: b00405fd 600187c8     set $c0 # ge f32 $r2 $r4
00000038: 10000601 0403c280     (lg $c0) mov b32 $r0 $r3
00000040: 10000605 0403c280     (lg $c0) mov b32 $r1 $r3
00000048: 10000609 0403c280     (lg $c0) mov b32 $r2 $r3
00000050: 50000003 00000280     (lg $c0) break
00000058: 10000011 2400c780     ld $r4 b32 c0[0x0]
00000060: b00405fd 600107c8     set $c0 # g f32 $r2 $r4
00000068: 10000601 0403c280     (lg $c0) mov b32 $r0 $r3
00000070: 10000605 0403c280     (lg $c0) mov b32 $r1 $r3
00000078: 10000609 0403c280     (lg $c0) mov b32 $r2 $r3
00000080: 50000003 00000280     (lg $c0) break
00000088: c0000211 04367003     mul f32 $r4 $r1 0x43670000
00000090: b0000415 04204003     add f32 $r5 $r2 0x42040000
00000098: c0050811 00000780     mul rn f32 $r4 $r4 $r5
000000a0: 102e8015 0486563f     mov b32 $r5 0x486563ee
000000a8: e0050011 00010780     add f32 $r4 (mul $r0 $r5) $r4
000000b0: b00d0415 03f8cccf     add f32 $r5 $r2 0x3f8ccccd
000000b8: c0050811 00000780     mul rn f32 $r4 $r4 $r5
000000c0: b0000811 c0000780     presin f32 $r4 $r4
000000c8: 90000811 a0000780     cos f32 $r4 $r4
000000d0: 10088015 03f7ae17     mov b32 $r5 0x3f7ae148
000000d8: b00509fd 600107c8     set $c0 # g f32 $r4 $r5
000000e0: 10022003 00000100     (e $c0) bra 0x110
000000e8: 10008005 00000003     mov b32 $r1 0x0
000000f0: 1000800d 03f80003     mov b32 $r3 0x3f800000
000000f8: c00a0409 03ba3d73     mul f32 $r2 $r2 0x3ba3d70a
00000100: 10000201 0403c780     mov b32 $r0 $r1
00000108: 50000003 00000780     break
00000110: b0000409 03f80003   B add f32 $r2 $r2 0x3f800000
00000118: 10005003 00000780     bra 0x28
00000120: b00d0001 03dccccf   B add f32 $r0 $r0 0x3dcccccd
00000128: f0000001 e0000001     exit (never) nop

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