[Bug 110953] Adding a redundant single-iteration do-while loop causes different image to be rendered

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Jun 20 22:35:39 UTC 2019


--- Comment #5 from Ian Romanick <idr at freedesktop.org> ---
The problem is this bit of code loop_unroll_visitor::simple_unroll.

   if (limit_if != first_ir->as_if() || exit_branch_has_instructions)

The check that the first thing in the loop is an if-statement expects that to
only occur when the if-statement is a terminator for the loop (e.g., if (i > 6)
break;).  This loop starts with an if-statement that is not a terminator, so
the loop iteration count is incorrectly incremented.

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