https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80080
--- Comment #16 from iii at gcc dot gnu.org --- Author: iii Date: Mon Dec 3 09:49:02 2018 New Revision: 266734 URL: https://gcc.gnu.org/viewcvs?rev=266734&root=gcc&view=rev Log: Repeat jump threading after combine Consider the following RTL: (insn (set (reg 65) (if_then_else (eq %cc 0) 1 0))) (insn (parallel [(set %cc (compare (reg 65) 0)) (clobber %scratch)])) (jump_insn (set %pc (if_then_else (ne %cc 0) (label_ref 23) %pc))) Combine simplifies this into: (note NOTE_INSN_DELETED) (note NOTE_INSN_DELETED) (jump_insn (set %pc (if_then_else (eq %cc 0) (label_ref 23) %pc))) opening up the possibility to perform jump threading. gcc/ChangeLog: 2018-12-03 Ilya Leoshkevich <i...@linux.ibm.com> PR target/80080 * cfgcleanup.c (class pass_postreload_jump): New pass. (pass_postreload_jump::execute): Likewise. (make_pass_postreload_jump): Likewise. * passes.def: Add pass_postreload_jump before pass_postreload_cse. * tree-pass.h (make_pass_postreload_jump): New pass. gcc/testsuite/ChangeLog: 2018-12-03 Ilya Leoshkevich <i...@linux.ibm.com> PR target/80080 * gcc.target/s390/pr80080-4.c: New test. Added: trunk/gcc/testsuite/gcc.target/s390/pr80080-4.c Modified: trunk/gcc/ChangeLog trunk/gcc/cfgcleanup.c trunk/gcc/passes.def trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-pass.h
