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AMDGPU: enable 128-bit for local addr space under an option

Description

AMDGPU: enable 128-bit for local addr space under an option

Author: Samuel Pitoiset

ds_read_b128 and ds_write_b128 have been recently enabled
under the amdgpu-ds128 option because the performance benefit
is unclear.

Though, using 128-bit loads/stores for the local address space
appears to introduce regressions in tessellation shaders. Not
sure what is broken, but as ds_read_b128/ds_write_b128 are not
enabled by default, just introduce a global option and enable
128-bit only if requested (until it's fixed/used correctly).

v2: - fix regressions in merge-stores.ll and multiple_tails.ll

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105464

Details

Committed
marekoApr 10 2018, 3:48 PM
Parents
rL329763: Disable flaky tests till they get fixed.
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