[aarch64-port-dev ] RFR: Disable C2 peephole by default for aarch64
Felix Yang
felix.yang at linaro.org
Sat Aug 29 13:13:27 UTC 2015
Hi JIT members,
Currently, the C2 peephole optimization is only enabled by default for
x86 & aarch64 port.
But we don't have any peephole rules for aarch64 port, scanning the
instruction stream
in PhasePeephole::do_transform does not make sense but a waste of time
for this port.
So I am disabling this pass for aarch64 port by default, can anyone
sponsor this if approved?
PATCH:
diff -r a6acc533dfef src/cpu/aarch64/vm/c2_globals_aarch64.hpp
--- a/src/cpu/aarch64/vm/c2_globals_aarch64.hpp Wed Aug 19 16:16:54 2015
+0100
+++ b/src/cpu/aarch64/vm/c2_globals_aarch64.hpp Fri Aug 28 09:28:07 2015
+0800
@@ -69,7 +69,7 @@
// Peephole and CISC spilling both break the graph, and so makes the
// scheduler sick.
-define_pd_global(bool, OptoPeephole, true);
+define_pd_global(bool, OptoPeephole, false);
define_pd_global(bool, UseCISCSpill, true);
define_pd_global(bool, OptoScheduling, false);
define_pd_global(bool, OptoBundling, false);
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