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| author | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-12-10 10:36:34 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-12-10 10:36:34 +0000 |
| commit | 9afe613d121c99e66ca2224dcb426604867151e3 (patch) | |
| tree | e46fdce4d40c4bb4c63c81edfc3b4fa386a35d80 /llvm/test/CodeGen/SystemZ/Large/branch-range-03.py | |
| parent | b00a0e2971f5fbc1c069dbc4b4019ed5ca304fe9 (diff) | |
| download | bcm5719-llvm-9afe613d121c99e66ca2224dcb426604867151e3.tar.gz bcm5719-llvm-9afe613d121c99e66ca2224dcb426604867151e3.zip | |
Add TargetLowering::prepareVolatileOrAtomicLoad
One unusual feature of the z architecture is that the result of a
previous load can be reused indefinitely for subsequent loads, even if
a cache-coherent store to that location is performed by another CPU.
A special serializing instruction must be used if you want to force
a load to be reattempted.
Since volatile loads are not supposed to be omitted in this way,
we should insert a serializing instruction before each such load.
The same goes for atomic loads.
The patch implements this at the IR->DAG boundary, in a similar way
to atomic fences. It is a no-op for targets other than SystemZ.
llvm-svn: 196905
Diffstat (limited to 'llvm/test/CodeGen/SystemZ/Large/branch-range-03.py')
| -rw-r--r-- | llvm/test/CodeGen/SystemZ/Large/branch-range-03.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/test/CodeGen/SystemZ/Large/branch-range-03.py b/llvm/test/CodeGen/SystemZ/Large/branch-range-03.py index 75cdf247c6f..5c9a93b87f7 100644 --- a/llvm/test/CodeGen/SystemZ/Large/branch-range-03.py +++ b/llvm/test/CodeGen/SystemZ/Large/branch-range-03.py @@ -79,7 +79,7 @@ for i in xrange(branch_blocks): next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main' print 'before%d:' % i print ' %%bstop%d = getelementptr i8 *%%stop, i64 %d' % (i, i) - print ' %%bcur%d = load volatile i8 *%%bstop%d' % (i, i) + print ' %%bcur%d = load i8 *%%bstop%d' % (i, i) print ' %%bext%d = sext i8 %%bcur%d to i32' % (i, i) print ' %%btest%d = icmp eq i32 %%limit, %%bext%d' % (i, i) print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next) @@ -96,7 +96,7 @@ for i in xrange(0, main_size, 6): for i in xrange(branch_blocks): print ' %%astop%d = getelementptr i8 *%%stop, i64 %d' % (i, i + 25) - print ' %%acur%d = load volatile i8 *%%astop%d' % (i, i) + print ' %%acur%d = load i8 *%%astop%d' % (i, i) print ' %%aext%d = sext i8 %%acur%d to i32' % (i, i) print ' %%atest%d = icmp eq i32 %%limit, %%aext%d' % (i, i) print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i) |
