Author: Armin Rigo <[email protected]>
Branch: shadowstack-perf
Changeset: r45265:f00b46ada731
Date: 2011-07-02 15:03 +0200
http://bitbucket.org/pypy/pypy/changeset/f00b46ada731/
Log: Seems to give better performance this way.
diff --git a/pypy/rpython/memory/gctransform/shadowstack.py
b/pypy/rpython/memory/gctransform/shadowstack.py
--- a/pypy/rpython/memory/gctransform/shadowstack.py
+++ b/pypy/rpython/memory/gctransform/shadowstack.py
@@ -290,13 +290,15 @@
llops = LowLevelOpList()
numcolors = -negnumcolors
c_numcolors = rmodel.inputconst(lltype.Signed, numcolors)
- base_addr = llops.genop("direct_call", [gct.incr_stack_ptr,
- c_numcolors],
- resulttype=llmemory.Address)
+ llops.genop("direct_call", [gct.incr_stack_ptr, c_numcolors],
+ resulttype=llmemory.Address)
+ top_addr = llops.genop("direct_call",
+ [gct.get_stack_top_ptr],
+ resulttype=llmemory.Address)
c_null = rmodel.inputconst(llmemory.Address, llmemory.NULL)
for k in range(numcolors):
- c_k = rmodel.inputconst(lltype.Signed, k)
- llops.genop("raw_store", [base_addr, c_type, c_k, c_null])
+ c_k = rmodel.inputconst(lltype.Signed, ~k)
+ llops.genop("raw_store", [top_addr, c_type, c_k, c_null])
graph.startblock.operations[:0] = llops
#
# Put at the end of the graph: "decr_stack()"
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