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jit_state: Split off CPSR.{E,T}

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This allows us to improve code-emission for PopRSBHint. We also improve
code emission other terminals at the same time.
This commit is contained in:
MerryMage 2017-12-02 15:24:10 +00:00
parent 3cca3bbd0b
commit 311361b409
5 changed files with 67 additions and 72 deletions
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16
docs/ReturnStackBufferOptimization.md
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@ -26,10 +26,10 @@ computing a 64-bit `UniqueHash` that is guaranteed to uniquely identify a block.
u64 LocationDescriptor::UniqueHash() const {
// This value MUST BE UNIQUE.
// This calculation has to match up with EmitX64::EmitTerminalPopRSBHint
u64 pc_u64 = u64(arm_pc);
u64 fpscr_u64 = u64(fpscr.Value()) << 32;
u64 t_u64 = cpsr.T() ? (1ull << 35) : 0;
u64 e_u64 = cpsr.E() ? (1ull << 39) : 0;
u64 pc_u64 = u64(arm_pc) << 32;
u64 fpscr_u64 = u64(fpscr.Value());
u64 t_u64 = cpsr.T() ? 1 : 0;
u64 e_u64 = cpsr.E() ? 2 : 0;
return pc_u64 | fpscr_u64 | t_u64 | e_u64;
}
@ -120,12 +120,10 @@ To check if a predicition is in the RSB, we linearly scan the RSB.
using namespace Xbyak::util;
// This calculation has to match up with IREmitter::PushRSB
code->mov(ebx, MJitStateCpsr());
code->mov(ecx, MJitStateReg(Arm::Reg::PC));
code->and_(ebx, u32((1 << 5) | (1 << 9)));
code->shr(ebx, 2);
code->or_(ebx, dword[r15 + offsetof(JitState, FPSCR_mode)]);
code->shl(rbx, 32);
code->shl(rcx, 32);
code->mov(ebx, dword[r15 + offsetof(JitState, FPSCR_mode)]);
code->or_(ebx, dword[r15 + offsetof(JitState, CPSR_et)]);
code->or_(rbx, rcx);
code->mov(rax, u64(code->GetReturnFromRunCodeAddress()));