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a32_emit_x64: Assert that memory layout assumption in EmitA32GetCpsr is valid

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MerryMage 2018-07-26 19:25:35 +01:00
parent b48fb8ca6b
commit 9fe2bf8733
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src/backend_x64/a32_emit_x64.cpp
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@ -287,6 +287,7 @@ void A32EmitX64::EmitA32GetCpsr(A32EmitContext& ctx, IR::Inst* inst) {
// Here we observe that CPSR_q and CPSR_nzcv are right next to each other in memory, // Here we observe that CPSR_q and CPSR_nzcv are right next to each other in memory,
// so we load them both at the same time with one 64-bit read. This allows us to // so we load them both at the same time with one 64-bit read. This allows us to
// extract all of their bits together at once with one pext. // extract all of their bits together at once with one pext.
static_assert(offsetof(A32JitState, CPSR_q) + 4 == offsetof(A32JitState, CPSR_nzcv));
code.mov(result.cvt64(), qword[r15 + offsetof(A32JitState, CPSR_q)]); code.mov(result.cvt64(), qword[r15 + offsetof(A32JitState, CPSR_q)]);
code.mov(b.cvt64(), 0xF000000000000001ull); code.mov(b.cvt64(), 0xF000000000000001ull);
code.pext(result.cvt64(), result.cvt64(), b.cvt64()); code.pext(result.cvt64(), result.cvt64(), b.cvt64());