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backend/x64: Reduce conversions required for cpsr_nzcv

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The guest program often accesses the NZCV flags directly much less
often than we need to use them for jumps and other such uses.

Therefore, we store our flags in cpsr_nzcv in a x64-friendly format.

This allows for a reduction in conditional jump related code.
This commit is contained in:
MerryMage 2020-05-06 22:08:38 +01:00
parent f4922a97f6
commit 8b3bc92bce
7 changed files with 213 additions and 189 deletions
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7
src/backend/x64/a32_jitstate.cpp
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@ -5,6 +5,7 @@
#include "backend/x64/a32_jitstate.h"
#include "backend/x64/block_of_code.h"
#include "backend/x64/nzcv_util.h"
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/common_types.h"
@ -45,14 +46,14 @@ namespace Dynarmic::Backend::X64 {
*/
u32 A32JitState::Cpsr() const {
DEBUG_ASSERT((cpsr_nzcv & ~0xF0000000) == 0);
DEBUG_ASSERT((cpsr_nzcv & ~NZCV::x64_mask) == 0);
DEBUG_ASSERT((cpsr_q & ~1) == 0);
DEBUG_ASSERT((cpsr_jaifm & ~0x010001DF) == 0);
u32 cpsr = 0;
// NZCV flags
cpsr |= cpsr_nzcv;
cpsr |= NZCV::FromX64(cpsr_nzcv);
// Q flag
cpsr |= cpsr_q ? 1 << 27 : 0;
// GE flags
@ -74,7 +75,7 @@ u32 A32JitState::Cpsr() const {
void A32JitState::SetCpsr(u32 cpsr) {
// NZCV flags
cpsr_nzcv = cpsr & 0xF0000000;
cpsr_nzcv = NZCV::ToX64(cpsr);
// Q flag
cpsr_q = Common::Bit<27>(cpsr) ? 1 : 0;
// GE flags