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authorKenneth Graunke <[email protected]>2016-10-15 03:18:36 -0700
committerKenneth Graunke <[email protected]>2016-10-24 14:33:38 -0700
commit27715c73ff84349466f62df0023863acd477f262 (patch)
tree4b36a22b357f11465796860a030d0df3eda49305 /docs
parent3728ee000aecb19793dec56d45aff9d6cfce3e5b (diff)
i965: Make split_virtual_grfs() call compact_virtual_grfs().
Post-splitting, VGRFs have a maximum size (MAX_VGRF_SIZE). This is required by the register allocator, as we have to create classes for each size of VGRF. We can (and do) allocate virtual registers larger than MAX_VGRF_SIZE, but we must ensure that they are splittable. split_virtual_grfs() asserts that the post-splitting register size is in range. Unfortunately, these trip for completely dead registers which are too large - we only set split points for live registers. So dead ones are never split, and if they happened to be too large, they'd trip asserts. To fix this, call compact_virtual_grfs() to eliminate dead registers before splitting. v2: Add a comment written by Iago. Cc: [email protected] Signed-off-by: Kenneth Graunke <[email protected]> Reviewed-by: Iago Toral Quiroga <[email protected]> Reviewed-by: Timothy Arceri <[email protected]>
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