GCC modified for the FreeChainXenon project
a04bf39f61
When working on a cost tweaking patch, I found that a newly added test case has different dumpings with stage-1 and bootstrapped gcc. By looking into it, the apparent reason is vect_analyze_loop_2 doesn't get slp_done_for_suggested_uf set expectedly, the following retrying will use the garbage slp_done_for_suggested_uf instead. In fact, the setting of slp_done_for_suggested_uf only happens when the previous analysis succeeds, for the mentioned test case, its previous analysis does fail, it's unexpected to use the value of slp_done_for_suggested_uf any more. In function vect_analyze_loop_1, we only return success when res is true, which is the result of 1st analysis. It means we never try to vectorize with unroll_vinfo if the previous analysis fails. So this patch shouldn't break anything, and just stop some useless analysis early. gcc/ChangeLog: * tree-vect-loop.cc (vect_analyze_loop_1): Don't retry analysis with suggested unroll factor once the previous analysis fails. |
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