[Bug 105670] [regression][hang] Trine1EE hangs GPU after loading screen on Mesa3D-17.3 and later

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105670

--- Comment #7 from Gert Wollny <gw.fossdev at gmail.com> ---
I tried to create a piglit, but so far i failed. So here is a dumped down
version of the loop contained in the relevant shader: 

const vec4 ps_lc21 = vec4(5.00000000e-01, -5.00000000e-01, 
                          0.00000000e+00, 0.00000000e+00);
const vec4 ps_lc20 = vec4(1.00000000e+00, 3.92156886e-03, 
                          1.53787005e-05, 2.00000003e-01);
const vec4 ps_lc19 = vec4(3.30000013e-01, -1.70000002e-01, 
                          4.00000000e+00, 1.00000001e-01);
const vec4 ps_lc18 = vec4(2.00000000e+00, -1.00000000e+00, 
                          1.00000005e-03, 0.00000000e+00);
const vec4 ps_lc17 = vec4(-5.00000000e-01, 1.00000000e+00, 
                          2.00000000e+00, -9.99999978e-03);

R0.w = (ps_lc17.y);
for (tmpInt0 = 0; tmpInt0 < 4; tmpInt0++) {
   R6.xyz = ((R5.xyz * ps_lc20.www) + R6.xyz);
   R9.xyzw = (textureLod(ps_sampler4, R6.xy, R6.w).xyzw);
   R3.w = ((R9.w * ps_lc20.y) + R9.z);
   R5.w = ((R3.w * -ps_c[11].y) + ps_in[7].z);
   tmp0.w = (R5.w >= 0.0 ? abs(ps_lc18.w) : abs(ps_lc18.y));
   R5.w = (tmp0.w);
   R3.w = ((R3.w * ps_c[11].y) + -R6.z);
   tmp0.w = (R3.w >= 0.0 ? abs(ps_lc18.w) : abs(ps_lc18.y));
   R3.w = (tmp0.w);
   R3.w = (R5.w * R3.w);
   if (R3.w != -R3.w) {
      R8.xy = (R6.xy);
      R3.w = (R0.w);
      if (R3.w != -R3.w) 
         break;
   }
}

the working TGSI looks like this:

IMM[0] FLT32 {    2.0000,    -1.0000,     1.0000,     0.0010}
IMM[1] FLT32 {    0.3300,    -0.1700,    -0.0000,    -1.0000}
IMM[2] FLT32 {   -0.5000,     0.0000,     0.1000,    -2.0000}
IMM[3] FLT32 {    1.0000,     0.0039,     0.0000,    -0.0100}
IMM[4] FLT32 {   -0.5000,     1.0000,    -0.0100,     0.0000}
IMM[5] FLT32 {   -1.0000,     0.0000,     4.0000,     0.5000}
IMM[6] FLT32 {    0.5000,    -0.5000,     0.2000,     0.0000}
IMM[7] INT32 {0, 4, 1, 0}

...
218  MOV TEMP[2].w, IMM[0].zzzz
219  MOV TEMP[8].x, IMM[7].xxxx
220: BGNLOOP
221:   ISGE TEMP[13].x, TEMP[8].xxxx, IMM[7].yyyy
222:   UIF TEMP[13].xxxx
223:     BRK
224:   ENDIF
225:   MAD TEMP[14].xyz, TEMP[11].xyzz, IMM[6].zzzz, TEMP[14].xyzz
226:   MOV TEMP[13].xy, TEMP[14].xyyy
227:   MOV TEMP[13].w, TEMP[14].wwww
228:   TXL TEMP[13], TEMP[13], SAMP[4], 2D
229:   MOV TEMP[15], TEMP[13]
230:   MAD TEMP[13].x, TEMP[13].wwww, IMM[3].yyyy, TEMP[13].zzzz
231:   MAD TEMP[15].x, TEMP[13].xxxx, -CONST[0][11].yyyy, TEMP[1].zzzz
232:   FSGE TEMP[15].x, TEMP[15].xxxx, IMM[2].yyyy
233:   UIF TEMP[15].xxxx
234:     MOV TEMP[9].x, IMM[2].yyyy
235:   ELSE
236:     MOV TEMP[9].x, IMM[0].zzzz
237:   ENDIF
238:   MOV TEMP[11].w, TEMP[9].xxxx
239:   MAD TEMP[13].x, TEMP[13].xxxx, CONST[0][11].yyyy, -TEMP[14].zzzz
240:   FSGE TEMP[13].x, TEMP[13].xxxx, IMM[2].yyyy
241:   UIF TEMP[13].xxxx
242:     MOV TEMP[12].x, IMM[2].yyyy
243:   ELSE
244:     MOV TEMP[12].x, IMM[0].zzzz
245:   ENDIF
246:   MOV TEMP[6].w, TEMP[12].xxxx
247:   MUL TEMP[6].x, TEMP[9].xxxx, TEMP[12].xxxx
248:   MOV TEMP[7].w, TEMP[6].xxxx
249:   FSNE TEMP[6].x, TEMP[6].xxxx, -TEMP[6].xxxx
250:   UIF TEMP[6].xxxx
251:     MOV TEMP[4].xy, TEMP[14].xyxx
252:     MOV TEMP[7].w, TEMP[2].wwww
253:     FSNE TEMP[6].x, TEMP[2].wwww, -TEMP[2].wwww
254:     UIF TEMP[6].xxxx
255:       BRK
256:     ENDIF
257:   ENDIF
258:   UADD TEMP[8].x, TEMP[8].xxxx, IMM[7].zzzz
259: ENDLOOP

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