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Hi, As commented in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80815#c1, We can relax minimal segment length of DR_B for merging. With this change, the new test can be improved to only one alias check. Note the condition is still accurate after this patch, it won't introduce false alias. Bootstrap and test on x86_64 and AArch64, is it OK? 2017-05-22 Bin Cheng <bin.cheng@arm.com> * tree-data-ref.c (prune_runtime_alias_test_list): Relax minimal segment length for dr_b. gcc/testsuite/ChangeLog 2017-05-22 Bin Cheng <bin.cheng@arm.com> * gcc.dg/vect/pr80815-3.c: New test.
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0004-minimal-seg-length-for-dr_b-20170516.txt
Description: 0004-minimal-seg-length-for-dr_b-20170516.txt
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