GCC modified for the FreeChainXenon project
f35af8df24
loop_version currently does lv_adjust_loop_entry_edge before it loopifys the copy inserted on the header. This patch moves the condition generation later and thus we have four pieces to help understanding of how the adjustment works: 1) duplicating the loop on the entry edge. 2) loopify the duplicated new loop. 3) adjusting the CFG to insert a condition branching to either loop with lv_adjust_loop_entry_edge. 4) From loopify extract the scale_loop_frequencies bits. Also removed some piece of code seems obviously useless: - redirect_all_edges since it is false and loopify only called once. - extract_cond_bb_edges and lv_flush_pending_stmts (false_edge) as the edge is not redirected actually. gcc/ChangeLog: 2021-11-01 Xionghu Luo <luoxhu@linux.ibm.com> * cfgloopmanip.c (loop_version): Refactor loopify to loop_version. Move condition generation after loopify. (loopify): Delete. * cfgloopmanip.h (loopify): Delete. |
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