rex::ppc::FPSCRRegister Struct Reference

#include <rex/ppc/context.h>

Public Types
using	Platform = FPSCRPlatform

Public Member Functions
u32	GetCSR () noexcept
void	SetCSR (u32 value) noexcept
void	RestoreGuestBits (u32 saved) noexcept
u32	LoadFromHost () noexcept
void	StoreToHost (u32 value) noexcept
void	EnableFlushModeUnconditional () noexcept
void	DisableFlushModeUnconditional () noexcept
void	EnableFlushMode () noexcept
void	DisableFlushMode () noexcept
void	SetFlushMode (bool enable) noexcept
void	InitHost () noexcept

Public Attributes
u32	csr

Static Public Attributes
static constexpr size_t	kRoundShift = Platform::kRoundShift
static constexpr size_t	kRoundMaskVal = Platform::kRoundMaskVal
static constexpr size_t	kFlushMask = Platform::kFlushMask
static constexpr u32	kGuestMask = static_cast<u32>(kRoundMaskVal) | static_cast<u32>(kFlushMask)

Detailed Description

Floating point status and control register (FPSCR).

Member Typedef Documentation

Platform

using rex::ppc::FPSCRRegister::Platform = FPSCRPlatform

Host access to the floating point control word.

Member Function Documentation

DisableFlushMode()

void rex::ppc::FPSCRRegister::DisableFlushMode ( )

inlinenoexcept

Turns off flush to zero mode, writing csr to the host only when the mode was on.

DisableFlushModeUnconditional()

void rex::ppc::FPSCRRegister::DisableFlushModeUnconditional ( )

inlinenoexcept

Turns off flush to zero mode and writes csr to the host without checking its current state.

EnableFlushMode()

void rex::ppc::FPSCRRegister::EnableFlushMode ( )

inlinenoexcept

Turns on flush to zero mode, writing csr to the host only when the mode was off.

EnableFlushModeUnconditional()

void rex::ppc::FPSCRRegister::EnableFlushModeUnconditional ( )

inlinenoexcept

Turns on flush to zero mode and writes csr to the host without checking its current state.

GetCSR()

u32 rex::ppc::FPSCRRegister::GetCSR ( )

inlinenoexcept

Returns the host floating point control register. It is the MXCSR on x86 and the FPCR on ARM.

InitHost()

void rex::ppc::FPSCRRegister::InitHost ( )

inlinenoexcept

Reads the host control word, applies the host exception policy and writes it back.

LoadFromHost()

u32 rex::ppc::FPSCRRegister::LoadFromHost ( )

inlinenoexcept

Reads the host control word into csr.

Returns

The guest rounding mode matching the host rounding mode.

RestoreGuestBits()

void rex::ppc::FPSCRRegister::RestoreGuestBits ( u32 saved )

inlinenoexcept

Restores the guest owned bits of csr from a saved word.

SetCSR()

void rex::ppc::FPSCRRegister::SetCSR ( u32 value )

inlinenoexcept

Writes the host floating point control register.

Parameters

value

The MXCSR on x86 and the FPCR on ARM.

SetFlushMode()

void rex::ppc::FPSCRRegister::SetFlushMode ( bool enable )

inlinenoexcept

Sets flush to zero mode, writing csr to the host only when the mode changes.

Parameters

enable

True to turn flush to zero on, false to turn it off.

StoreToHost()

void rex::ppc::FPSCRRegister::StoreToHost ( u32 value )

inlinenoexcept

Sets the host rounding mode from a guest rounding mode and writes csr to the host.

Parameters

value

The guest rounding mode, one of the kRound constants.

Member Data Documentation

csr

u32 rex::ppc::FPSCRRegister::csr

Host floating point control word as last read or written.

kFlushMask

size_t rex::ppc::FPSCRRegister::kFlushMask = Platform::kFlushMask

staticconstexpr

Mask of the host flush to zero and denormals are zero bits in csr.

kGuestMask

u32 rex::ppc::FPSCRRegister::kGuestMask = static_cast<u32>(kRoundMaskVal) | static_cast<u32>(kFlushMask)

staticconstexpr

Bits the guest owns, the rest is host policy set by InitHost.

kRoundMaskVal

size_t rex::ppc::FPSCRRegister::kRoundMaskVal = Platform::kRoundMaskVal

staticconstexpr

Mask of the host rounding field in csr.

kRoundShift

size_t rex::ppc::FPSCRRegister::kRoundShift = Platform::kRoundShift

staticconstexpr

Bit position of the host rounding field in csr.

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The documentation for this struct was generated from the following file:

• rex/ppc/context.h