[Mesa-dev] [PATCH] ir_to_mesa: fix copy propagation

[Christoph Bumiller]

The current copy propagation code would propagate TEMP[0].x from (6)
into TEMP[1].x from (8) in the following, which is clearly wrong:

  6:   MOV TEMP[1].x, TEMP[0].xxxx
  7:   MOV TEMP[0].x, TEMP[0].yyyy
  8:   MOV TEMP[0].y, TEMP[1].xxxx
  9:   ADD TEMP[1].x, TEMP[0].zzzz, IMM[0].yyyy
 10:   MOV TEMP[0].z, TEMP[1].xxxx

Possible patch and a small program to check this attached.
Tested with llvmpipe.

Christoph
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