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| author | Richard Henderson <rth@redhat.com> | 2001-05-20 13:03:15 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2001-05-20 13:03:15 -0700 |
| commit | d9214e537de1b3251676c568012d1eedc69ccc2f (patch) | |
| tree | ef588464921b3bbf64f226e7bea4390a4d198e50 /gcc/sched-deps.c | |
| parent | b161c5059b749a24d085a924260b7fe0a8cc9ee9 (diff) | |
| download | gcc-d9214e537de1b3251676c568012d1eedc69ccc2f.zip gcc-d9214e537de1b3251676c568012d1eedc69ccc2f.tar.gz gcc-d9214e537de1b3251676c568012d1eedc69ccc2f.tar.bz2 | |
sched-deps.c (sched_analyze_insn): Force volatile memory reads to be output before a branch.
* sched-deps.c (sched_analyze_insn): Force volatile memory reads
to be output before a branch.
From-SVN: r42358
Diffstat (limited to 'gcc/sched-deps.c')
| -rw-r--r-- | gcc/sched-deps.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c index ecdf2821..d303e7a 100644 --- a/gcc/sched-deps.c +++ b/gcc/sched-deps.c @@ -1044,12 +1044,25 @@ sched_analyze_insn (deps, x, insn, loop_notes) CLEAR_REG_SET (&tmp); + /* All memory writes and volatile reads must happen before the + jump. Non-volatile reads must happen before the jump iff + the result is needed by the above register used mask. */ + pending = deps->pending_write_insns; pending_mem = deps->pending_write_mems; while (pending) { add_dependence (insn, XEXP (pending, 0), REG_DEP_OUTPUT); + pending = XEXP (pending, 1); + pending_mem = XEXP (pending_mem, 1); + } + pending = deps->pending_read_insns; + pending_mem = deps->pending_read_mems; + while (pending) + { + if (MEM_VOLATILE_P (XEXP (pending_mem, 0))) + add_dependence (insn, XEXP (pending, 0), REG_DEP_OUTPUT); pending = XEXP (pending, 1); pending_mem = XEXP (pending_mem, 1); } |