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| author | Eric Botcazou <ebotcazou@adacore.com> | 2021-05-05 16:50:55 +0200 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@adacore.com> | 2021-05-05 16:53:58 +0200 |
| commit | dfd2c92f3f5d204619bd218aa72b162997690796 (patch) | |
| tree | e28add6a3413e829b25ba4676365a604b01bf436 /gcc | |
| parent | 14cf6aab8578132ec89ccb46e69899ae6008ff63 (diff) | |
| download | gcc-dfd2c92f3f5d204619bd218aa72b162997690796.zip gcc-dfd2c92f3f5d204619bd218aa72b162997690796.tar.gz gcc-dfd2c92f3f5d204619bd218aa72b162997690796.tar.bz2 | |
Fix PR rtl-optimization/100411
This is the bootstrap failure of GCC 11 on MinGW64 configured with --enable-
tune=nocona. The bottom line is that SEH does not support CFI for epilogues
but the x86 back-end nevertheless attaches it to instructions, so we have to
filter it out and this is done by detecting the end of the prologue by means
of the NOTE_INSN_PROLOGUE_END note.
But the compiler manages to generate a second epilogue before this note in
the RTL stream and this fools the aforementioned logic. The root cause is
cross-jumping, which inserts a jump before the end of the prologue, in fact
just before the note; the rest (CFG cleanup, BB reordering, etc) is downhill
from there.
gcc/
PR rtl-optimization/100411
* cfgcleanup.c (try_crossjump_to_edge): Also skip end of prologue
and beginning of function markers.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cfgcleanup.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c index f05cb61..17edc4f 100644 --- a/gcc/cfgcleanup.c +++ b/gcc/cfgcleanup.c @@ -2145,7 +2145,11 @@ try_crossjump_to_edge (int mode, edge e1, edge e2, if (NOTE_INSN_BASIC_BLOCK_P (newpos1)) newpos1 = NEXT_INSN (newpos1); - while (DEBUG_INSN_P (newpos1)) + /* Skip also prologue and function markers. */ + while (DEBUG_INSN_P (newpos1) + || (NOTE_P (newpos1) + && (NOTE_KIND (newpos1) == NOTE_INSN_PROLOGUE_END + || NOTE_KIND (newpos1) == NOTE_INSN_FUNCTION_BEG))) newpos1 = NEXT_INSN (newpos1); redirect_from = split_block (src1, PREV_INSN (newpos1))->src; |