suyu/dynarmic
26
1
Fork 1
Code Issues Pull requests Projects Releases Packages Wiki Activity

Use XOR when loading a zero immediate

Browse source
This commit is contained in:
Tillmann Karras 2016-08-06 21:04:13 +01:00
parent 55204a80d0
commit 9264e2e04c
1 changed files with 5 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
src/backend_x64/reg_alloc.cpp
View file

@ -485,7 +485,11 @@ std::tuple<HostLoc, bool> RegAlloc::UseHostLoc(IR::Inst* use_inst, HostLocList d
Gen::X64Reg RegAlloc::LoadImmediateIntoRegister(IR::Value imm, Gen::X64Reg reg) { Gen::X64Reg RegAlloc::LoadImmediateIntoRegister(IR::Value imm, Gen::X64Reg reg) {
ASSERT_MSG(imm.IsImmediate(), "imm is not an immediate"); ASSERT_MSG(imm.IsImmediate(), "imm is not an immediate");
code->MOV(32, Gen::R(reg), ImmediateToOpArg(imm)); Gen::OpArg op_arg = ImmediateToOpArg(imm);
if (op_arg.GetImmValue() == 0)
code->XOR(32, Gen::R(reg), Gen::R(reg));
else
code->MOV(32, Gen::R(reg), op_arg);
return reg; return reg;
} }