Author: Remi Meier <[email protected]>
Branch: stmgc-c4
Changeset: r68653:c9086eff1e22
Date: 2014-01-13 18:05 +0100
http://bitbucket.org/pypy/pypy/changeset/c9086eff1e22/
Log: add a medium slowpath for write-barriers on private_from_protected
objects
diff --git a/rpython/jit/backend/x86/assembler.py
b/rpython/jit/backend/x86/assembler.py
--- a/rpython/jit/backend/x86/assembler.py
+++ b/rpython/jit/backend/x86/assembler.py
@@ -529,6 +529,18 @@
mc = codebuf.MachineCodeBlockWrapper()
#
if not for_frame:
+ if descr.stmcat in ['A2W', 'A2V']:
+ # slow fastpath
+ flag = StmGC.GCFLAG_PRIVATE_FROM_PROTECTED >> 40
+ off = 5
+ assert 0 < flag < 256
+ mc.MOV_rs(X86_64_SCRATCH_REG.value, WORD)
+ mc.TEST8_mi((X86_64_SCRATCH_REG.value, off), flag)
+ mc.J_il8(rx86.Conditions['Z'], 0)
+ jz = mc.get_relative_pos()
+ mc.RET()
+ mc.overwrite(jz - 1, chr(mc.get_relative_pos() - jz))
+
self._push_all_regs_to_frame(mc, [], withfloats, callee_only=True)
if IS_X86_32:
# we have 2 extra words on stack for retval and we pass 1 extra
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