[Bug 84977] New: r300/compiler: register allocation pass generate invalid swizzle for r300/r400

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=84977

            Bug ID: 84977
           Summary: r300/compiler: register allocation pass generate
                    invalid swizzle for r300/r400
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: david.heidelberger@ixit.cz

Created attachment 107808
  --> https://bugs.freedesktop.org/attachment.cgi?id=107808&action=edit
r300_deadsource.txt

Error:
Not a native swizzle: 00000fc3

Can be workarounded forcing

diff --git a/src/gallium/drivers/r300/compiler/radeon_pair_regalloc.c
b/src/gallium/drivers/r300/compiler/radeon_pair_regalloc.c
index 14f93fb..5682b55 100644
--- a/src/gallium/drivers/r300/compiler/radeon_pair_regalloc.c
+++ b/src/gallium/drivers/r300/compiler/radeon_pair_regalloc.c
@@ -432,6 +432,8 @@ static enum rc_reg_class variable_get_class(
                }
        }

+       can_change_writemask = 0;
+
        class_index = find_class(classes, writemask,
                                                can_change_writemask ? 3 : 1);
 done:

Seems like if "(!r300_swizzle_is_native_basic(new_swizzle)) {"
didn't check this one swizzle (checked by fprintf).

Output from register allocation pass compared with can_change_writemask = 0;

--- r300_regalloc.txt       2014-10-14 01:51:00.813113749 +0200
+++ r300_regalloc-workaround.txt    2014-10-14 01:51:40.207223071 +0200
@@ -10,20 +10,20 @@
      DP3, src0.xyz, src0.xyz
      DP3 temp[3].w, src0._, src0._
   5: src0.xyz = input[3], src0.w = temp[3]
-     DP3 temp[7].z, src0.xyz, src0.xyz
+     DP3 temp[8].x, src0.xyz, src0.xyz
      RSQ temp[4].w, |src0.w|
-  6: src0.xyz = input[6], src1.xyz = temp[7]
-     DP3 temp[7].z, src0.xyz, src0.xyz
-     RSQ temp[5].w, |src1.z|
-  7: src0.xyz = input[5], src0.w = temp[3]
+  6: src0.xyz = input[6], src1.xyz = temp[8]
      DP3 temp[8].x, src0.xyz, src0.xyz
+     RSQ temp[5].w, |src1.x|
+  7: src0.xyz = input[5], src0.w = temp[3]
+     DP3 temp[9].x, src0.xyz, src0.xyz
      MAD temp[3].w, -src0.w, src0.1, src0.1
-  8: src0.w = temp[4], src1.xyz = input[4], src2.xyz = temp[8]
+  8: src0.w = temp[4], src1.xyz = input[4], src2.xyz = temp[9]
      MAD temp[4].xyz, src0.www, src1.xyz, src0.000
      RSQ temp[4].w, |src2.x|
-  9: src0.xyz = temp[7], src1.xyz = temp[7]
+  9: src0.xyz = temp[7], src1.xyz = temp[8]
      MAD temp[7].xy, src0.xy_, src0.11_, src0.HH_
-     RSQ temp[6].w, |src1.z|
+     RSQ temp[6].w, |src1.x|
  10: src0.xyz = input[3], src0.w = temp[5], src2.xyz = temp[4]
      MAD temp[3].xyz, src0.xyz, src0.www, src2.xyz
  11: src0.xyz = input[5], src0.w = temp[4]
@@ -38,10 +38,10 @@
  15: src0.xyz = temp[6], src1.xyz = temp[4]
      DP3_SAT temp[4].x, src0.xyz, src1.xyz
  16: src0.xyz = temp[3]
-     DP3 temp[4].y, src0.xyz, src0.xyz
- 17: src0.xyz = temp[5], src1.xyz = const[7], src2.xyz = temp[4]
+     DP3 temp[7].x, src0.xyz, src0.xyz
+ 17: src0.xyz = temp[5], src1.xyz = const[7], src2.xyz = temp[7]
      MAD temp[5].xy, src0.xy_, src1.xx_, src1.yy_
-     RSQ temp[5].w, |src2.y|
+     RSQ temp[5].w, |src2.x|
  18: src0.xyz = temp[4], src0.w = input[0], src1.xyz = input[0]
      MAD temp[0].xyz, src0.xxx, src1.xyz, src0.000
      MAD temp[0].w, src0.x, src0.w, src0.0
@@ -53,24 +53,24 @@
      DP3_SAT, src0.xyz, src1.xyz
      DP3_SAT temp[5].w, src0._, src0._
  22: src0.xyz = temp[5], src0.w = const[7], src1.xyz = const[7]
-     MAD temp[3].x, src0.y__, src1.z__, src0.w__
+     MAD temp[3].z, src0.__y, src1.__z, src0.__w
      MAD temp[6].w, src0.x, src1.z, src0.w
  23: src0.xyz = temp[5], src0.w = temp[6], src1.xyz = temp[3], src1.w =
const[6]
-     MAD temp[3].x, src0.y__, src1.x__, src1.w__
+     MAD temp[3].z, src0.__y, src1.__z, src1.__w
      MAD temp[6].w, src0.x, src0.w, src1.w
  24: src0.xyz = temp[5], src0.w = temp[6], src1.xyz = temp[3], src2.xyz =
const[8]
-     MAD temp[3].x, src0.y__, src1.x__, src2.x__
+     MAD temp[3].z, src0.__y, src1.__z, src2.__x
      MAD temp[6].w, src0.x, src0.w, src2.x
  25: src0.w = temp[5]
      LG2 temp[5].w, src0.w
  26: src0.xyz = temp[5], src0.w = temp[6], src1.xyz = temp[3]
-     MAD temp[6].x, src0.y__, src1.x__, -src0.H__
+     MAD temp[6].z, src0.__y, src1.__z, -src0.__H
      MAD temp[6].w, src0.x, src0.w, -src0.H
  27: src0.xyz = temp[5], src0.w = temp[5], src1.xyz = temp[6], src1.w =
temp[6], src2.xyz = const[4]
-     MAD temp[3].xy, src0.xy_, src1.wx_, src0.11_
+     MAD temp[3].xy, src0.xy_, src1.wz_, src0.11_
      MAD temp[5].w, src0.w, src2.x, src0.0
  28: src0.xyz = temp[3], src0.w = temp[4]
-     MAD temp[3].x, -src0.x__, src0.1__, src0.y__
+     MAD temp[3].y, -src0._x_, src0._1_, src0._y_
      MAD temp[4].w, -src0.x, src0.1, src0.w
  29: src0.w = temp[5]
      EX2 temp[5].w, src0.w
@@ -78,7 +78,7 @@
      MAD temp[1].xyz, src1.www, src1.xyz, src0.000
      MAD temp[1].w, src1.w, src0.w, src0.0
  31: src0.xyz = temp[3]
-     RCP temp[5].w, src0.x
+     RCP temp[5].w, src0.y
  32: src0.w = temp[4], src1.w = temp[5]
      MAD_SAT temp[4].w, src1.w, src0.w, src0.0
  33: src0.xyz = const[8], src0.w = temp[4]
@@ -110,4 +110,4 @@
      MAD temp[0].w, src2.w, srcp.w, src0.0
  43: src0.xyz = temp[0], src0.w = temp[0]
      MAD color[0].xyz, src0.xyz, src0.111, src0.000
-     MAD color[0].w, src0.w, src0.1, src0.0
+     MAD color[0].w, src0.w, src0.1, src0.0

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