diff options
| author | Jim Wilson <wilson@gcc.gnu.org> | 1994-12-28 18:39:10 -0800 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1994-12-28 18:39:10 -0800 |
| commit | 8c2977e27dc94cd658658ca9bc48875019c434fc (patch) | |
| tree | 5bf32a1048cb73221b4777734b8a0df423a3872a /gcc | |
| parent | 40d2032bdfbfe0c8f3c80f69235c91a570ce0967 (diff) | |
| download | gcc-8c2977e27dc94cd658658ca9bc48875019c434fc.zip gcc-8c2977e27dc94cd658658ca9bc48875019c434fc.tar.gz gcc-8c2977e27dc94cd658658ca9bc48875019c434fc.tar.bz2 | |
(fill_simple_delay_slots): For the epilogue case...
(fill_simple_delay_slots): For the epilogue case, set needed
to include frame pointer and stack pointer, don't include all of
end_of_function_needs. Reject insn if it sets a previously set
resource.
From-SVN: r8698
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/reorg.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/gcc/reorg.c b/gcc/reorg.c index cd7d652..e4058d7 100644 --- a/gcc/reorg.c +++ b/gcc/reorg.c @@ -3146,9 +3146,27 @@ fill_simple_delay_slots (first, non_jumps_p) return; slots_filled = 0; - needed = end_of_function_needs; CLEAR_RESOURCE (&set); + /* The frame pointer and stack pointer are needed at the beginning of + the epilogue, so instructions setting them can not be put in the + epilogue delay slot. However, everything else needed at function + end is safe, so we don't want to use end_of_function_needs here. */ + CLEAR_RESOURCE (&needed); + if (frame_pointer_needed) + { + SET_HARD_REG_BIT (needed.regs, FRAME_POINTER_REGNUM); +#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM + SET_HARD_REG_BIT (needed.regs, HARD_FRAME_POINTER_REGNUM); +#endif +#ifdef EXIT_IGNORE_STACK + if (! EXIT_IGNORE_STACK) +#endif + SET_HARD_REG_BIT (needed.regs, STACK_POINTER_REGNUM); + } + else + SET_HARD_REG_BIT (needed.regs, STACK_POINTER_REGNUM); + for (trial = get_last_insn (); ! stop_search_p (trial, 1); trial = PREV_INSN (trial)) { @@ -3160,6 +3178,7 @@ fill_simple_delay_slots (first, non_jumps_p) if (! insn_references_resource_p (trial, &set, 1) && ! insn_sets_resource_p (trial, &needed, 1) + && ! insn_sets_resource_p (trial, &set, 1) #ifdef HAVE_cc0 /* Don't want to mess with cc0 here. */ && ! reg_mentioned_p (cc0_rtx, pat) |