On 10/12, Jason Ekstrand wrote:
In order to implement the ballot intrinsic, we do a MOV from flag register to some GRF. If that GRF is used in a SEL, cmod propagation helpfully changes it into a MOV from the flag register with a cmod. This is perfectly valid but when lower_simd_width comes along, it simply splits into two instructions which both have conditional modifiers. This is a problem since we're reading the flag register. This commit makes us check whether or not flags_written() overlaps with the flag values that we are reading via the instruction source and, if we have any interference, will force us to emit a copy of the source.Cc: mesa-sta...@lists.freedesktop.org
Reviewed-by: Matt Turner <matts...@gmail.com>
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