i965/vec4: Extract depctrl hazards
Move this to a separate function so that we can begin to add other little caveats without making too big a mess. NOTE: There is some desire to improve this function eventually, but we need to fix a bug first. v2: Use const for the inst for the hazard check (Matt) Invert safe logic to get rid of the double negative (Matt) Add PRM reference for predicates (Matt) Add note about empirical evidence for math (Matt) Signed-off-by:Ben Widawsky <ben@bwidawsk.net> Reviewed-by:
Matt Turner <mattst88@gmail.com>
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