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constant_pool: Allow for 128-bit constants

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This commit is contained in:
MerryMage 2018-02-10 16:25:07 +00:00
parent 69de50a878
commit 1423584f9f
4 changed files with 9 additions and 7 deletions
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4
src/backend_x64/block_of_code.cpp
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@ -189,8 +189,8 @@ void BlockOfCode::SwitchMxcsrOnExit() {
ldmxcsr(dword[r15 + jsi.offsetof_save_host_MXCSR]); ldmxcsr(dword[r15 + jsi.offsetof_save_host_MXCSR]);
} }
Xbyak::Address BlockOfCode::MConst(u64 constant) { Xbyak::Address BlockOfCode::MConst(u64 lower, u64 upper) {
return constant_pool.GetConstant(constant); return constant_pool.GetConstant(lower, upper);
} }
void BlockOfCode::SwitchToFarCode() { void BlockOfCode::SwitchToFarCode() {

2
src/backend_x64/block_of_code.h
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@ -70,7 +70,7 @@ public:
} }
} }
Xbyak::Address MConst(u64 constant); Xbyak::Address MConst(u64 lower, u64 upper = 0);
/// Far code sits far away from the near code. Execution remains primarily in near code. /// Far code sits far away from the near code. Execution remains primarily in near code.
/// "Cold" / Rarely executed instructions sit in far code, so the CPU doesn't fetch them unless necessary. /// "Cold" / Rarely executed instructions sit in far code, so the CPU doesn't fetch them unless necessary.

6
src/backend_x64/constant_pool.cpp
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@ -20,11 +20,13 @@ ConstantPool::ConstantPool(BlockOfCode& code, size_t size) : code(code), pool_si
current_pool_ptr = pool_begin; current_pool_ptr = pool_begin;
} }
Xbyak::Address ConstantPool::GetConstant(u64 constant) { Xbyak::Address ConstantPool::GetConstant(u64 lower, u64 upper) {
const auto constant = std::make_tuple(lower, upper);
auto iter = constant_info.find(constant); auto iter = constant_info.find(constant);
if (iter == constant_info.end()) { if (iter == constant_info.end()) {
ASSERT(static_cast<size_t>(current_pool_ptr - pool_begin) < pool_size); ASSERT(static_cast<size_t>(current_pool_ptr - pool_begin) < pool_size);
std::memcpy(current_pool_ptr, &constant, sizeof(u64)); std::memcpy(current_pool_ptr, &lower, sizeof(u64));
std::memcpy(current_pool_ptr + sizeof(u64), &upper, sizeof(u64));
iter = constant_info.emplace(constant, current_pool_ptr).first; iter = constant_info.emplace(constant, current_pool_ptr).first;
current_pool_ptr += align_size; current_pool_ptr += align_size;
} }

4
src/backend_x64/constant_pool.h
View file

@ -24,12 +24,12 @@ class ConstantPool final {
public: public:
ConstantPool(BlockOfCode& code, size_t size); ConstantPool(BlockOfCode& code, size_t size);
Xbyak::Address GetConstant(u64 constant); Xbyak::Address GetConstant(u64 lower, u64 upper = 0);
private: private:
static constexpr size_t align_size = 16; // bytes static constexpr size_t align_size = 16; // bytes
std::map<u64, void*> constant_info; std::map<std::tuple<u64, u64>, void*> constant_info;
BlockOfCode& code; BlockOfCode& code;
size_t pool_size; size_t pool_size;