tree 1b37839ecde19abb45b7c946958c729b0bc9d219
parent efd7fc0b1d3534dfc8fdef2f12e414b12e511a33
author Nicolas Capens <capn@google.com> 1562702680 -0400
committer Nicolas Capens <nicolascapens@google.com> 1563546042 +0000

Avoid dynamic branches on in-bounds loads

When robustBufferAccess is disabled, applications must guarantee that
no accesses will go out of bounds (statically or dynamically). For
accesses with static equal or sequential offsets this means they'll be
in-bounds for both active and inactive lanes. Hence we can omit all
lane masking on such load operations.

Bug: b/131224163
Bug: b/135609394
Change-Id: I8ef2d42b0159af0ee425bbd3ef5898ce971d8491
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33928
Tested-by: Nicolas Capens <nicolascapens@google.com>
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>