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As Robin spotted, my recent commit r13-3716 caused an ICE on s390 if vector access with length is enabled there (his patch for the enablement hasn't been committed yet). The failure is caused by one stupid typo, the bias on s390 is -1, so the assertion should use tree_fits_shwi_p rather than tree_fits_uhwi_p. Thanks for Robin's catching. I just reproduced the ICE and verified the fix worked fine with a cross build, the optimized dump against the test case gcc.target/powerpc/pr107412.c looked expected. gcc/ChangeLog: * gimple-fold.cc (gimple_fold_partial_load_store_mem_ref): Use tree_fits_shwi_p rather than tree_fits_uhwi_p as bias is signed.
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