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Frontend: Make lookup tables static in MapModRMToReg

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Allows clang to emit better code, since it doesn't need to push all the
values onto the stack and off again for every invocation.
This commit is contained in:
Lioncash committed 2021-06-16 16:47:12 -04:00
1 parent a8855a330a
commit c40ca14b5b
1 file changed
+7 -5
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External/FEXCore/Source/Interface/Core/Frontend.cpp
Vendored
+7 -5
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@@ -21,7 +21,9 @@ namespace FEXCore::Frontend {
using namespace FEXCore::X86Tables;
static uint32_t MapModRMToReg(uint8_t REX, uint8_t bits, bool HighBits, bool HasREX, bool HasXMM, bool HasMM, uint8_t InvalidOffset = 16) {
constexpr std::array<uint64_t, 16> GPRIndexes = {
using GPRArray = std::array<uint64_t, 16>;
static constexpr GPRArray GPRIndexes = {
// Classical ordering?
FEXCore::X86State::REG_RAX,
FEXCore::X86State::REG_RCX,
@@ -41,7 +43,7 @@ static uint32_t MapModRMToReg(uint8_t REX, uint8_t bits, bool HighBits, bool Has
FEXCore::X86State::REG_R15,
};
constexpr std::array<uint64_t, 16> GPR8BitHighIndexes = {
static constexpr GPRArray GPR8BitHighIndexes = {
// Classical ordering?
FEXCore::X86State::REG_RAX,
FEXCore::X86State::REG_RCX,
@@ -61,7 +63,7 @@ static uint32_t MapModRMToReg(uint8_t REX, uint8_t bits, bool HighBits, bool Has
FEXCore::X86State::REG_R15,
};
constexpr std::array<uint64_t, 16> XMMIndexes = {
static constexpr GPRArray XMMIndexes = {
FEXCore::X86State::REG_XMM_0,
FEXCore::X86State::REG_XMM_1,
FEXCore::X86State::REG_XMM_2,
@@ -80,7 +82,7 @@ static uint32_t MapModRMToReg(uint8_t REX, uint8_t bits, bool HighBits, bool Has
FEXCore::X86State::REG_XMM_15,
};
constexpr std::array<uint64_t, 16> MMIndexes = {
static constexpr GPRArray MMIndexes = {
FEXCore::X86State::REG_MM_0,
FEXCore::X86State::REG_MM_1,
FEXCore::X86State::REG_MM_2,
@@ -99,7 +101,7 @@ static uint32_t MapModRMToReg(uint8_t REX, uint8_t bits, bool HighBits, bool Has
FEXCore::X86State::REG_INVALID
};
const std::array<uint64_t, 16> *GPRs = &GPRIndexes;
const GPRArray *GPRs = &GPRIndexes;
if (HasXMM) {
GPRs = &XMMIndexes;
}