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- do not use instructions from too recent instruction set extensions.

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andn is part of BMI1 which was introduced in 2012, which is far too recent to be used unchecked.
This commit is contained in:
Christoph Oelckers 2018-11-17 13:10:18 +01:00
parent adde0510fe
commit fcb5684607
1 changed files with 2 additions and 1 deletions
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3
src/scripting/vm/jit_load.cpp
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@ -257,7 +257,8 @@ void JitCompiler::EmitReadBarrier()
cc.mov(mask.r32(), asmjit::x86::dword_ptr(regA[A], offsetof(DObject, ObjectFlags)));
cc.shl(mask, 63 - 5); // put OF_EuthanizeMe (1 << 5) in the highest bit
cc.sar(mask, 63); // sign extend so all bits are set if OF_EuthanizeMe was set
cc.andn(regA[A], mask, regA[A]);
cc.not_(mask);
cc.and_(regA[A], mask);
cc.bind(isnull);
}