runtime/vm/flow_graph_compiler_arm.cc - Issue 602993002: Frees up LR on arm for use by the register allocator.

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Unified Diff: runtime/vm/flow_graph_compiler_arm.cc

Issue 602993002: Frees up LR on arm for use by the register allocator. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/

Patch Set: Created 6 years, 3 months ago

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Index: runtime/vm/flow_graph_compiler_arm.cc

===================================================================

--- runtime/vm/flow_graph_compiler_arm.cc (revision 40683)

+++ runtime/vm/flow_graph_compiler_arm.cc (working copy)

@@ -184,6 +184,10 @@

ASSERT(deopt_env() != NULL);

StubCode* stub_code = compiler->isolate()->stub_code();

+ // LR may be live. It will be clobbered by BranchLink, so cache it in IP.

+ // It will be restored at the top of the deoptimization stub, specifically in

+ // GenerateDeoptimizationSequence in stub_code_arm.cc.

+ __ mov(IP, Operand(LR));

__ BranchLink(&stub_code->DeoptimizeLabel());

set_pc_offset(assem->CodeSize());

#undef __

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