[Mesa-dev] [PATCH] r600g: Why all this fiddling with tgsi_helper_copy?

Jerome Glisse j.glisse at gmail.com
Mon Dec 13 11:19:09 PST 2010

2010/12/13 Christian König <deathsimple at vodafone.de>:
> tgsi_helper_copy is used on several occasions to copy a temporary result
> into the real destination register to emulate writemasks for OP3 and
> reduction operations. According to R600 ISA that's unnecessary.

What in R600 ISA makes you think so (page) ? write mask is bit 4
SQ_ALU_WORD1_OP2 but bit 4 of SQ_ALU_WORD1_OP3 is in SRC2_SEL field.


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