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pco/ra: properly handle non-dced instrs with unused defs

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Signed-off-by: Simon Perretta <simon.perretta@imgtec.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36412>
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Simon Perretta 2025-09-10 15:32:02 +01:00 • committed by Marge Bot
parent 34993085f4
commit ee1b1e4a60
1 changed files with 8 additions and 0 deletions
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8
src/imagination/pco/pco_ra.c
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@ -731,6 +731,14 @@ static bool pco_ra_func(pco_func *func, pco_ra_ctx *ctx)
}
}
/* If there are instructions left with any unused dests that aren't/couldn't
* be DCEd (e.g. because of side effects), ensure their range ends are setup
* to avoid missing overlaps and clobbering regs.
*/
for (unsigned var = 0; var < num_vars; ++var)
if (live_ranges[var].start != ~0U && live_ranges[var].end == 0)
live_ranges[var].end = live_ranges[var].start;
/* Build interference graph from overlapping live ranges. */
for (unsigned var0 = 0; var0 < num_vars; ++var0) {
for (unsigned var1 = var0 + 1; var1 < num_vars; ++var1) {