From 5d517141037264e94ae503a0f883f074aad2b8fb Mon Sep 17 00:00:00 2001 From: Steven Bosscher Date: Sun, 28 Oct 2012 11:52:11 +0000 Subject: re PR rtl-optimization/38711 (ira should not be using df-lr except at -O1.) PR rtl-optimization/38711 * ira.c (ira): Remove DF_LIVE if the problem is in the stack. (do_reload): Add it back at the end for -O2 and higher. * function.c (thread_prologue_and_epilogue_insns): Use REG_SET_TO_HARD_REG_SET instead of CLEAR_HARD_REG_SET and reg_set_to_hard_reg_set. From-SVN: r192890 --- gcc/ira.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'gcc/ira.c') diff --git a/gcc/ira.c b/gcc/ira.c index 9a8b098..8dcdbf5 100644 --- a/gcc/ira.c +++ b/gcc/ira.c @@ -4399,6 +4399,16 @@ ira (FILE *f) setup_prohibited_mode_move_regs (); df_note_add_problem (); + + /* DF_LIVE can't be used in the register allocator, too many other + parts of the compiler depend on using the "classic" liveness + interpretation of the DF_LR problem. See PR38711. + Remove the problem, so that we don't spend time updating it in + any of the df_analyze() calls during IRA/LRA. */ + if (optimize > 1) + df_remove_problem (df_live); + gcc_checking_assert (df_live == NULL); + #ifdef ENABLE_CHECKING df->changeable_flags |= DF_VERIFY_SCHEDULED; #endif @@ -4678,6 +4688,12 @@ do_reload (void) df_scan_alloc (NULL); df_scan_blocks (); + if (optimize > 1) + { + df_live_add_problem (); + df_live_set_all_dirty (); + } + if (optimize) df_analyze (); -- cgit v1.1