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| author | Richard Henderson <rth@redhat.com> | 2011-10-06 15:22:11 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2011-10-06 15:22:11 -0700 |
| commit | 4efb91dfc345f1f98a49c07873e2b68f6b6237a3 (patch) | |
| tree | 5903c05e6219c8777f1f6d6aa856a5b515bf40f9 /gcc/combine-stack-adj.c | |
| parent | 7e8ec1ec7028923fb402a5f0db4c86352afd1f6e (diff) | |
| download | gcc-4efb91dfc345f1f98a49c07873e2b68f6b6237a3.zip gcc-4efb91dfc345f1f98a49c07873e2b68f6b6237a3.tar.gz gcc-4efb91dfc345f1f98a49c07873e2b68f6b6237a3.tar.bz2 | |
re PR middle-end/50632 (FAIL: gcc.dg/pr50132.c)
PR 50632
* combine-stack-adjust.c (maybe_move_args_size_note): Add after
parameter; use it to decide whether to merge two notes.
(combine_stack_adjustments_for_block): Use maybe_move_args_size_note
for the deallocation case as well.
From-SVN: r179637
Diffstat (limited to 'gcc/combine-stack-adj.c')
| -rw-r--r-- | gcc/combine-stack-adj.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/gcc/combine-stack-adj.c b/gcc/combine-stack-adj.c index bca0784..3cffd66 100644 --- a/gcc/combine-stack-adj.c +++ b/gcc/combine-stack-adj.c @@ -296,10 +296,11 @@ record_stack_refs (rtx *xp, void *data) return 0; } -/* If INSN has a REG_ARGS_SIZE note, move it to LAST. */ +/* If INSN has a REG_ARGS_SIZE note, move it to LAST. + AFTER is true iff LAST follows INSN in the instruction stream. */ static void -maybe_move_args_size_note (rtx last, rtx insn) +maybe_move_args_size_note (rtx last, rtx insn, bool after) { rtx note, last_note; @@ -309,7 +310,12 @@ maybe_move_args_size_note (rtx last, rtx insn) last_note = find_reg_note (last, REG_ARGS_SIZE, NULL_RTX); if (last_note) - XEXP (last_note, 0) = XEXP (note, 0); + { + /* The ARGS_SIZE notes are *not* cumulative. They represent an + absolute value, and the "most recent" note wins. */ + if (!after) + XEXP (last_note, 0) = XEXP (note, 0); + } else add_reg_note (last, REG_ARGS_SIZE, XEXP (note, 0)); } @@ -385,7 +391,7 @@ combine_stack_adjustments_for_block (basic_block bb) last_sp_adjust + this_adjust, this_adjust)) { - maybe_move_args_size_note (last_sp_set, insn); + maybe_move_args_size_note (last_sp_set, insn, false); /* It worked! */ delete_insn (insn); @@ -403,6 +409,8 @@ combine_stack_adjustments_for_block (basic_block bb) last_sp_adjust + this_adjust, -last_sp_adjust)) { + maybe_move_args_size_note (insn, last_sp_set, true); + /* It worked! */ delete_insn (last_sp_set); last_sp_set = insn; |