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authorKenneth Graunke <kenneth@whitecape.org>2012-06-16 02:08:13 -0700
committerKenneth Graunke <kenneth@whitecape.org>2012-06-18 15:25:31 -0700
commit5b83bdc154ec8d607a4c4d96171d0128e51abaec (patch)
treeaafad8aee6899d5e8d6c5ef8cc0207668b68563d /scons/gallium.py
parent6f7834ad366ef0d2a61fffbc969b8b6e2e750420 (diff)
i965: Fix brw_swap_cmod() for LE/GE comparisons.
The idea here is to rewrite comparisons like 2 >= x with x <= 2; we want to simply exchange arguments, not negate the condition. If equality was part of the original comparison, it should remain part of the swapped version. This is the true cause of bug #50298. It didn't manifest itself on Sandybridge because we embed the conditional modifier in the IF instruction rather than emitting a CMP. All other platforms use CMP. It also didn't manifest itself on the master branch because commit be5f27a84d ("glsl: Refine the loop instruction counting.") papered over the problem. NOTE: This is a candidate for stable release branches. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50298 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net>
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