backend/x64: Implement separate MSXCSR for ASIMDStandardValue

src/backend/x64/a32_jitstate.cpp

@@ -165,10 +165,11 @@ u32 A32JitState::Fpscr() const {
     DEBUG_ASSERT((fpsr_nzcv & ~FPSCR_NZCV_MASK) == 0);
 
     const u32 fpcr_mode = static_cast<u32>(upper_location_descriptor) & FPSCR_MODE_MASK;
+    const u32 mxcsr = guest_MXCSR | asimd_MXCSR;
 
     u32 FPSCR = fpcr_mode | fpsr_nzcv;
-    FPSCR |= (guest_MXCSR & 0b0000000000001);       // IOC = IE
+    FPSCR |= (mxcsr & 0b0000000000001);       // IOC = IE
-    FPSCR |= (guest_MXCSR & 0b0000000111100) >> 1;  // IXC, UFC, OFC, DZC = PE, UE, OE, ZE
+    FPSCR |= (mxcsr & 0b0000000111100) >> 1;  // IXC, UFC, OFC, DZC = PE, UE, OE, ZE
     FPSCR |= fpsr_exc;
 
     return FPSCR;
@@ -182,10 +183,9 @@ void A32JitState::SetFpscr(u32 FPSCR) {
     upper_location_descriptor |= FPSCR & FPSCR_MODE_MASK;
 
     fpsr_nzcv = FPSCR & FPSCR_NZCV_MASK;
-    guest_MXCSR = 0;
 
-    // Exception masks / enables
+    guest_MXCSR = 0x00001f80;
-    guest_MXCSR |= 0x00001f80; // mask all
+    asimd_MXCSR = 0x00001f80;
 
     // RMode
     const std::array<u32, 4> MXCSR_RMode {0x0, 0x4000, 0x2000, 0x6000};

src/backend/x64/a32_jitstate.h

@@ -48,6 +48,7 @@ struct A32JitState {
 
     // For internal use (See: BlockOfCode::RunCode)
     u32 guest_MXCSR = 0x00001f80;
+    u32 asimd_MXCSR = 0x00001f80;
     u32 save_host_MXCSR = 0;
     s64 cycles_to_run = 0;
     s64 cycles_remaining = 0;
@@ -83,6 +84,7 @@ struct A32JitState {
         cpsr_jaifm = src.cpsr_jaifm;
         ExtReg = src.ExtReg;
         guest_MXCSR = src.guest_MXCSR;
+        asimd_MXCSR = src.asimd_MXCSR;
         fpsr_exc = src.fpsr_exc;
         fpsr_qc = src.fpsr_qc;
         fpsr_nzcv = src.fpsr_nzcv;

src/backend/x64/a64_jitstate.cpp

@@ -55,7 +55,9 @@ u32 A64JitState::GetFpcr() const {
 void A64JitState::SetFpcr(u32 value) {
     fpcr = value & FPCR_MASK;
 
+    asimd_MXCSR &= 0x0000003D;
     guest_MXCSR &= 0x0000003D;
+    asimd_MXCSR |= 0x00001f80;
     guest_MXCSR |= 0x00001f80; // Mask all exceptions
 
     // RMode
@@ -93,9 +95,10 @@ void A64JitState::SetFpcr(u32 value) {
  */
 
 u32 A64JitState::GetFpsr() const {
+    const u32 mxcsr = guest_MXCSR | asimd_MXCSR;
     u32 fpsr = 0;
-    fpsr |= (guest_MXCSR & 0b0000000000001);       // IOC = IE
+    fpsr |= (mxcsr & 0b0000000000001);       // IOC = IE
-    fpsr |= (guest_MXCSR & 0b0000000111100) >> 1;  // IXC, UFC, OFC, DZC = PE, UE, OE, ZE
+    fpsr |= (mxcsr & 0b0000000111100) >> 1;  // IXC, UFC, OFC, DZC = PE, UE, OE, ZE
     fpsr |= fpsr_exc;
     fpsr |= (fpsr_qc == 0 ? 0 : 1) << 27;
     return fpsr;
@@ -103,6 +106,7 @@ u32 A64JitState::GetFpsr() const {
 
 void A64JitState::SetFpsr(u32 value) {
     guest_MXCSR &= ~0x0000003D;
+    asimd_MXCSR &= ~0x0000003D;
     fpsr_qc = (value >> 27) & 1;
     fpsr_exc = value & 0x9F;
 }

src/backend/x64/a64_jitstate.h

@@ -51,6 +51,7 @@ struct A64JitState {
 
     // For internal use (See: BlockOfCode::RunCode)
     u32 guest_MXCSR = 0x00001f80;
+    u32 asimd_MXCSR = 0x00001f80;
     u32 save_host_MXCSR = 0;
     s64 cycles_to_run = 0;
     s64 cycles_remaining = 0;

src/backend/x64/block_of_code.cpp

@@ -247,6 +247,16 @@ void BlockOfCode::SwitchMxcsrOnExit() {
     ldmxcsr(dword[r15 + jsi.offsetof_save_host_MXCSR]);
 }
 
+void BlockOfCode::EnterStandardASIMD() {
+    stmxcsr(dword[r15 + jsi.offsetof_guest_MXCSR]);
+    ldmxcsr(dword[r15 + jsi.offsetof_asimd_MXCSR]);
+}
+
+void BlockOfCode::LeaveStandardASIMD() {
+    stmxcsr(dword[r15 + jsi.offsetof_asimd_MXCSR]);
+    ldmxcsr(dword[r15 + jsi.offsetof_guest_MXCSR]);
+}
+
 void BlockOfCode::UpdateTicks() {
     cb.AddTicks->EmitCall(*this, [this](RegList param) {
         mov(param[0], qword[r15 + jsi.offsetof_cycles_to_run]);

src/backend/x64/block_of_code.h

@@ -59,6 +59,10 @@ public:
     void SwitchMxcsrOnEntry();
     /// Code emitter: Makes saved host MXCSR the current MXCSR
     void SwitchMxcsrOnExit();
+    /// Code emitter: Enter standard ASIMD MXCSR region
+    void EnterStandardASIMD();
+    /// Code emitter: Leave standard ASIMD MXCSR region
+    void LeaveStandardASIMD();
     /// Code emitter: Updates cycles remaining my calling cb.AddTicks and cb.GetTicksRemaining
     /// @note this clobbers ABI caller-save registers
     void UpdateTicks();

src/backend/x64/jitstate_info.h

@@ -16,6 +16,7 @@ struct JitStateInfo {
         , offsetof_cycles_to_run(offsetof(JitStateType, cycles_to_run))
         , offsetof_save_host_MXCSR(offsetof(JitStateType, save_host_MXCSR))
         , offsetof_guest_MXCSR(offsetof(JitStateType, guest_MXCSR))
+        , offsetof_asimd_MXCSR(offsetof(JitStateType, asimd_MXCSR))
         , offsetof_rsb_ptr(offsetof(JitStateType, rsb_ptr))
         , rsb_ptr_mask(JitStateType::RSBPtrMask)
         , offsetof_rsb_location_descriptors(offsetof(JitStateType, rsb_location_descriptors))
@@ -29,6 +30,7 @@ struct JitStateInfo {
     const size_t offsetof_cycles_to_run;
     const size_t offsetof_save_host_MXCSR;
     const size_t offsetof_guest_MXCSR;
+    const size_t offsetof_asimd_MXCSR;
     const size_t offsetof_rsb_ptr;
     const size_t rsb_ptr_mask;
     const size_t offsetof_rsb_location_descriptors;

src/common/fp/fpcr.h

@@ -180,6 +180,14 @@ public:
         return value;
     }
 
+    /// Gets the StandardFPSCRValue (A32 ASIMD).
+    FPCR ASIMDStandardValue() const {
+        FPCR stdvalue;
+        stdvalue.AHP(AHP());
+        stdvalue.FZ16(FZ16());
+        return stdvalue;
+    }
+
 private:
     // Bits 0-7, 13-14, and 27-31 are reserved.
     static constexpr u32 mask = 0x07FF9F00;