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CPU/Recompiler: Prefer adrp over trampoline for +/-4GB branches

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This commit is contained in:
Stenzek 2024-06-29 19:53:35 +10:00
parent f3671d21f3
commit 44142ab4f9
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2 changed files with 19 additions and 2 deletions
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20
src/core/cpu_recompiler_code_generator_aarch64.cpp
View file

@ -147,6 +147,20 @@ s64 CPU::Recompiler::armGetPCDisplacement(const void* current, const void* targe
return static_cast<s64>((reinterpret_cast<ptrdiff_t>(target) - reinterpret_cast<ptrdiff_t>(current)) >> 2);
}
bool CPU::Recompiler::armIsInAdrpRange(vixl::aarch64::Assembler* armAsm, const void* addr)
{
const void* cur = armAsm->GetCursorAddress<const void*>();
const void* current_code_ptr_page =
reinterpret_cast<const void*>(reinterpret_cast<uintptr_t>(cur) & ~static_cast<uintptr_t>(0xFFF));
const void* ptr_page =
reinterpret_cast<const void*>(reinterpret_cast<uintptr_t>(addr) & ~static_cast<uintptr_t>(0xFFF));
const s64 page_displacement = armGetPCDisplacement(current_code_ptr_page, ptr_page) >> 10;
const u32 page_offset = static_cast<u32>(reinterpret_cast<uintptr_t>(addr) & 0xFFFu);
return (vixl::IsInt21(page_displacement) &&
(a64::Assembler::IsImmAddSub(page_offset) || a64::Assembler::IsImmLogical(page_offset, 64)));
}
void CPU::Recompiler::armMoveAddressToReg(a64::Assembler* armAsm, const a64::Register& reg, const void* addr)
{
DebugAssert(reg.IsX());
@ -178,7 +192,8 @@ void CPU::Recompiler::armEmitJmp(a64::Assembler* armAsm, const void* ptr, bool f
const void* cur = armAsm->GetCursorAddress<const void*>();
s64 displacement = armGetPCDisplacement(cur, ptr);
bool use_blr = !vixl::IsInt26(displacement);
if (use_blr && !force_inline)
bool use_trampoline = use_blr && !armIsInAdrpRange(armAsm, ptr);
if (use_blr && use_trampoline && !force_inline)
{
if (u8* trampoline = armGetJumpTrampoline(ptr); trampoline)
{
@ -203,7 +218,8 @@ void CPU::Recompiler::armEmitCall(a64::Assembler* armAsm, const void* ptr, bool
const void* cur = armAsm->GetCursorAddress<const void*>();
s64 displacement = armGetPCDisplacement(cur, ptr);
bool use_blr = !vixl::IsInt26(displacement);
if (use_blr && !force_inline)
bool use_trampoline = use_blr && !armIsInAdrpRange(armAsm, ptr);
if (use_blr && use_trampoline && !force_inline)
{
if (u8* trampoline = armGetJumpTrampoline(ptr); trampoline)
{

1
src/core/cpu_recompiler_types.h
View file

@ -123,6 +123,7 @@ constexpr u32 MAX_FAR_HOST_BYTES_PER_INSTRUCTION = 128;
bool armIsCallerSavedRegister(u32 id);
s64 armGetPCDisplacement(const void* current, const void* target);
bool armIsInAdrpRange(vixl::aarch64::Assembler* armAsm, const void* addr);
void armMoveAddressToReg(vixl::aarch64::Assembler* armAsm, const vixl::aarch64::Register& reg, const void* addr);
void armEmitMov(vixl::aarch64::Assembler* armAsm, const vixl::aarch64::Register& rd, u64 imm);
void armEmitJmp(vixl::aarch64::Assembler* armAsm, const void* ptr, bool force_inline);