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author | Paul Berry <[email protected]> | 2013-11-26 14:37:57 -0800 |
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committer | Paul Berry <[email protected]> | 2013-11-29 21:46:13 -0800 |
commit | 9d2951ea0acdcd219ad28831ac9e7112737d9ca3 (patch) | |
tree | 1f2820bc641f55dd7d68dd27bd5a211a914e4625 /src/glsl/ir_reader.h | |
parent | 1fb106527faa195197fa52e28e1b941c97e520c2 (diff) |
glsl: Teach ir_variable_refcount about ir_loop::counter variables.
If an ir_loop has a non-null "counter" field, the variable referred to
by this field is implicitly read and written by the loop. We need to
account for this in ir_variable_refcount, otherwise there is a danger
we will try to dead-code-eliminate the loop counter variable.
Note: at the moment the dead code elimination bug doesn't occur due to
a bug in ir_hierarchical_visitor: it doesn't visit the "counter"
field, so dead code elimination doesn't treat it as a candidate for
elimination. But the patch to follow will fix that bug, so we need to
fix ir_variable_refcount first in order to avoid breaking dead code
elimination.
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/glsl/ir_reader.h')
0 files changed, 0 insertions, 0 deletions