re PR rtl-optimization/31455 (lower subreg causes a performance regression in…
re PR rtl-optimization/31455 (lower subreg causes a performance regression in the inner loop sometimes) PR rtl-optimization/31455 * lower-subreg.c (find_decomposable_subregs): Don't decompose subregs which have a cast between modes which are not tieable. From-SVN: r125265
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