diff options
| author | Jeff Sturm <jsturm@one-point.com> | 2001-09-17 23:16:28 +0000 |
|---|---|---|
| committer | Jeff Sturm <jsturm@gcc.gnu.org> | 2001-09-17 23:16:28 +0000 |
| commit | 5c701bb10c0655503db698572b537f3a3df8f9d1 (patch) | |
| tree | dd7f6e080847210376fcad70b237cd3df3c4dce4 /gcc/except.c | |
| parent | c793eea7abb23067e67179546acfea0db28af1ae (diff) | |
| download | gcc-5c701bb10c0655503db698572b537f3a3df8f9d1.zip gcc-5c701bb10c0655503db698572b537f3a3df8f9d1.tar.gz gcc-5c701bb10c0655503db698572b537f3a3df8f9d1.tar.bz2 | |
except.c (dw2_build_landing_pads): New local clobbers_hard_regs.
* except.c (dw2_build_landing_pads): New local
clobbers_hard_regs. Emit an ASM_INPUT as a scheduling
barrier after clobbers. Fixes c++/4012.
From-SVN: r45667
Diffstat (limited to 'gcc/except.c')
| -rw-r--r-- | gcc/except.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/except.c b/gcc/except.c index 90423a7..bc21b2c 100644 --- a/gcc/except.c +++ b/gcc/except.c @@ -1865,6 +1865,7 @@ dw2_build_landing_pads () { struct eh_region *region = cfun->eh->region_array[i]; rtx seq; + bool clobbers_hard_regs = false; /* Mind we don't process a region more than once. */ if (!region || region->region_number != i) @@ -1901,7 +1902,19 @@ dw2_build_landing_pads () if (r == INVALID_REGNUM) break; if (! call_used_regs[r]) - emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r))); + { + emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r))); + clobbers_hard_regs = true; + } + } + + if (clobbers_hard_regs) + { + /* @@@ This is a kludge. Not all machine descriptions define a + blockage insn, but we must not allow the code we just generated + to be reordered by scheduling. So emit an ASM_INPUT to act as + blockage insn. */ + emit_insn (gen_rtx_ASM_INPUT (VOIDmode, "")); } emit_move_insn (cfun->eh->exc_ptr, |