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Merge pull request #7414 from Sintendo/shortmovs 

x64Emitter: emit shorter MOVs for 64-bit immediates
This commit is contained in:
Tilka 2018-10-06 00:01:35 +01:00 committed by GitHub
parent b480db9392 8a93dd0105
commit 32ef8706e5
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 64 additions and 18 deletions
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24
Source/Core/Common/x64Emitter.cpp
View File

@ -1469,11 +1469,21 @@ void OpArg::WriteNormalOp(XEmitter* emit, bool toRM, NormalOp op, const OpArg& o
// mov reg64, imm64
else if (op == NormalOp::MOV)
{
emit->Write8(0xB8 + (offsetOrBaseReg & 7));
emit->Write64((u64)operand.offset);
return;
// movabs reg64, imm64 (10 bytes)
if (static_cast<s64>(operand.offset) != static_cast<s32>(operand.offset))
{
emit->Write8(0xB8 + (offsetOrBaseReg & 7));
emit->Write64(operand.offset);
return;
}
// mov reg64, simm32 (7 bytes)
emit->Write8(op_def.imm32);
immToWrite = 32;
}
else
{
ASSERT_MSG(DYNA_REC, 0, "WriteNormalOp - Only MOV can take 64-bit imm");
}
ASSERT_MSG(DYNA_REC, 0, "WriteNormalOp - Only MOV can take 64-bit imm");
}
else
{
@ -1581,6 +1591,12 @@ void XEmitter::XOR(int bits, const OpArg& a1, const OpArg& a2)
}
void XEmitter::MOV(int bits, const OpArg& a1, const OpArg& a2)
{
if (bits == 64 && a1.IsSimpleReg() && a2.scale == SCALE_IMM64 &&
a2.offset == static_cast<u32>(a2.offset))
{
WriteNormalOp(32, NormalOp::MOV, a1, a2.AsImm32());
return;
}
if (a1.IsSimpleReg() && a2.IsSimpleReg() && a1.GetSimpleReg() == a2.GetSimpleReg())
ERROR_LOG(DYNA_REC, "Redundant MOV @ %p - bug in JIT?", code);
WriteNormalOp(bits, NormalOp::MOV, a1, a2);

58
Source/UnitTests/Common/x64EmitterTest.cpp
View File

@ -35,7 +35,10 @@ const std::vector<NamedReg> reg8names{
};
const std::vector<NamedReg> reg8hnames{
{AH, "ah"}, {BH, "bh"}, {CH, "ch"}, {DH, "dh"},
{AH, "ah"},
{BH, "bh"},
{CH, "ch"},
{DH, "dh"},
};
const std::vector<NamedReg> reg16names{
@ -306,10 +309,12 @@ TEST_F(x64EmitterTest, CMOVcc_Register)
emitter->CMOVcc(32, RAX, R(R12), cc.cc);
emitter->CMOVcc(16, RAX, R(R12), cc.cc);
ExpectDisassembly("cmov" + cc.name + " rax, r12 "
"cmov" +
cc.name + " eax, r12d "
"cmov" +
ExpectDisassembly("cmov" + cc.name +
" rax, r12 "
"cmov" +
cc.name +
" eax, r12d "
"cmov" +
cc.name + " ax, r12w");
}
}
@ -379,10 +384,12 @@ TEST_F(x64EmitterTest, MOVNT_DQ_PS_PD)
emitter->MOVNTDQ(MatR(RAX), r.reg);
emitter->MOVNTPS(MatR(RAX), r.reg);
emitter->MOVNTPD(MatR(RAX), r.reg);
ExpectDisassembly("movntdq dqword ptr ds:[rax], " + r.name + " "
"movntps dqword ptr ds:[rax], " +
r.name + " "
"movntpd dqword ptr ds:[rax], " +
ExpectDisassembly("movntdq dqword ptr ds:[rax], " + r.name +
" "
"movntps dqword ptr ds:[rax], " +
r.name +
" "
"movntpd dqword ptr ds:[rax], " +
r.name);
}
}
@ -547,6 +554,24 @@ TWO_OP_ARITH_TEST(OR)
TWO_OP_ARITH_TEST(XOR)
TWO_OP_ARITH_TEST(MOV)
TEST_F(x64EmitterTest, MOV_Imm64)
{
for (size_t i = 0; i < reg64names.size(); i++)
{
emitter->MOV(64, R(reg64names[i].reg), Imm64(0xDEADBEEFDEADBEEF));
EXPECT_EQ(emitter->GetCodePtr(), code_buffer + 10);
ExpectDisassembly("mov " + reg64names[i].name + ", 0xdeadbeefdeadbeef");
emitter->MOV(64, R(reg64names[i].reg), Imm64(0xFFFFFFFFDEADBEEF));
EXPECT_EQ(emitter->GetCodePtr(), code_buffer + 7);
ExpectDisassembly("mov " + reg64names[i].name + ", 0xffffffffdeadbeef");
emitter->MOV(64, R(reg64names[i].reg), Imm64(0xDEADBEEF));
EXPECT_EQ(emitter->GetCodePtr(), code_buffer + 5 + (i > 7));
ExpectDisassembly("mov " + reg32names[i].name + ", 0xdeadbeef");
}
}
// TODO: Disassembler inverts operands here.
// TWO_OP_ARITH_TEST(XCHG)
// TWO_OP_ARITH_TEST(TEST)
@ -558,7 +583,8 @@ TEST_F(x64EmitterTest, BSWAP)
int bits;
std::vector<NamedReg> regs;
} regsets[] = {
{32, reg32names}, {64, reg64names},
{32, reg32names},
{64, reg64names},
};
for (const auto& regset : regsets)
for (const auto& r : regset.regs)
@ -871,7 +897,8 @@ TWO_OP_SSE_TEST(PMOVZXDQ, "qword")
std::string out_name; \
std::string size; \
} regsets[] = { \
{32, reg32names, "eax", "dword"}, {64, reg64names, "rax", "qword"}, \
{32, reg32names, "eax", "dword"}, \
{64, reg64names, "rax", "qword"}, \
}; \
for (const auto& regset : regsets) \
for (const auto& r : regset.regs) \
@ -903,7 +930,8 @@ VEX_RMR_TEST(BZHI)
std::string out_name; \
std::string size; \
} regsets[] = { \
{32, reg32names, "eax", "dword"}, {64, reg64names, "rax", "qword"}, \
{32, reg32names, "eax", "dword"}, \
{64, reg64names, "rax", "qword"}, \
}; \
for (const auto& regset : regsets) \
for (const auto& r : regset.regs) \
@ -934,7 +962,8 @@ VEX_RRM_TEST(ANDN)
std::string out_name; \
std::string size; \
} regsets[] = { \
{32, reg32names, "eax", "dword"}, {64, reg64names, "rax", "qword"}, \
{32, reg32names, "eax", "dword"}, \
{64, reg64names, "rax", "qword"}, \
}; \
for (const auto& regset : regsets) \
for (const auto& r : regset.regs) \
@ -963,7 +992,8 @@ VEX_RM_TEST(BLSI)
std::string out_name; \
std::string size; \
} regsets[] = { \
{32, reg32names, "eax", "dword"}, {64, reg64names, "rax", "qword"}, \
{32, reg32names, "eax", "dword"}, \
{64, reg64names, "rax", "qword"}, \
}; \
for (const auto& regset : regsets) \
for (const auto& r : regset.regs) \