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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #11 from David Heidelberger (okias) <david.heidelberger at ixit.cz> ---
Created attachment 108592
  --> https://bugs.freedesktop.org/attachment.cgi?id=108592&action=edit
r300_regalloc-separated_workaround.txt

I made separeted workaround with line 

if (writemask == 12) can_change_writemask = 0;

$ diff -Naur r300_regalloc.txt r300_regalloc-separated_workaround.txt 
--- r300_regalloc.txt   2014-10-28 22:54:13.673516366 +0100
+++ r300_regalloc-separated_workaround.txt      2014-10-28 22:54:05.065450759
+0100
@@ -64,10 +64,10 @@
  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.__x, -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__

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