From af9068f3b9086c2ad19d211233733f2c5e9f6d21 Mon Sep 17 00:00:00 2001 From: jakub Date: Wed, 2 Aug 2017 07:13:25 +0000 Subject: [PATCH] PR middle-end/79499 * function.c (thread_prologue_and_epilogue_insns): Determine blocks for find_many_sub_basic_blocks bitmap by looking up BLOCK_FOR_INSN of first NONDEBUG_INSN_P in each of the split_prologue_seq and prologue_seq sequences - if any. * gcc.dg/pr79499.c: New test. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@250814 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 8 ++++++++ gcc/function.c | 36 +++++++++++++++++++++++++++++------- gcc/testsuite/ChangeLog | 5 +++++ gcc/testsuite/gcc.dg/pr79499.c | 13 +++++++++++++ 4 files changed, 55 insertions(+), 7 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/pr79499.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index faacba28422..d9f8e3e7e8c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,11 @@ +2017-08-02 Jakub Jelinek + + PR middle-end/79499 + * function.c (thread_prologue_and_epilogue_insns): Determine blocks + for find_many_sub_basic_blocks bitmap by looking up BLOCK_FOR_INSN + of first NONDEBUG_INSN_P in each of the split_prologue_seq and + prologue_seq sequences - if any. + 2017-08-02 Richard Biener * tree-vect-stmts.c (vectorizable_store): Perform vector extracts diff --git a/gcc/function.c b/gcc/function.c index 62e72eb2a9f..86f14847cfa 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -6048,20 +6048,42 @@ thread_prologue_and_epilogue_insns (void) if (split_prologue_seq || prologue_seq) { + rtx_insn *split_prologue_insn = split_prologue_seq; if (split_prologue_seq) - insert_insn_on_edge (split_prologue_seq, orig_entry_edge); + { + while (split_prologue_insn && !NONDEBUG_INSN_P (split_prologue_insn)) + split_prologue_insn = NEXT_INSN (split_prologue_insn); + insert_insn_on_edge (split_prologue_seq, orig_entry_edge); + } + rtx_insn *prologue_insn = prologue_seq; if (prologue_seq) - insert_insn_on_edge (prologue_seq, entry_edge); + { + while (prologue_insn && !NONDEBUG_INSN_P (prologue_insn)) + prologue_insn = NEXT_INSN (prologue_insn); + insert_insn_on_edge (prologue_seq, entry_edge); + } commit_edge_insertions (); /* Look for basic blocks within the prologue insns. */ - auto_sbitmap blocks (last_basic_block_for_fn (cfun)); - bitmap_clear (blocks); - bitmap_set_bit (blocks, entry_edge->dest->index); - bitmap_set_bit (blocks, orig_entry_edge->dest->index); - find_many_sub_basic_blocks (blocks); + if (split_prologue_insn + && BLOCK_FOR_INSN (split_prologue_insn) == NULL) + split_prologue_insn = NULL; + if (prologue_insn + && BLOCK_FOR_INSN (prologue_insn) == NULL) + prologue_insn = NULL; + if (split_prologue_insn || prologue_insn) + { + auto_sbitmap blocks (last_basic_block_for_fn (cfun)); + bitmap_clear (blocks); + if (split_prologue_insn) + bitmap_set_bit (blocks, + BLOCK_FOR_INSN (split_prologue_insn)->index); + if (prologue_insn) + bitmap_set_bit (blocks, BLOCK_FOR_INSN (prologue_insn)->index); + find_many_sub_basic_blocks (blocks); + } } default_rtl_profile (); diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 4e126f073f0..41ccd0df844 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2017-08-02 Jakub Jelinek + + PR middle-end/79499 + * gcc.dg/pr79499.c: New test. + 2017-08-02 Richard Biener PR tree-optimization/81633 diff --git a/gcc/testsuite/gcc.dg/pr79499.c b/gcc/testsuite/gcc.dg/pr79499.c new file mode 100644 index 00000000000..509549ff2fd --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr79499.c @@ -0,0 +1,13 @@ +/* PR middle-end/79499 */ +/* { dg-do compile { target split_stack } } */ +/* { dg-options "-O2 -fsplit-stack -fno-omit-frame-pointer" } */ + +struct S { struct S *a, *b; }; + +void +foo (struct S *x) +{ + do + x->b = x->a; + while (x = x->a); +} -- 2.11.4.GIT