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Add CPU misdetection workaround for the Pentium G840 and a llvm_cpu CVAR that can force codegen to a specific CPU architecture

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This commit is contained in:
Magnus Norddahl 2016-11-03 12:02:07 +01:00
parent 7cba67ad45
commit 356830a8c8
1 changed files with 19 additions and 1 deletions
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20
src/r_compiler/llvmdrawers.cpp
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@ -35,6 +35,14 @@
#include "r_compiler/ssa/ssa_struct_type.h"
#include "r_compiler/ssa/ssa_value.h"
#include "r_compiler/ssa/ssa_barycentric_weight.h"
#include "x86.h"
#include "c_cvars.h"
#include "version.h"
CUSTOM_CVAR(String, llvm_cpu, "auto", CVAR_ARCHIVE | CVAR_NOINITCALL)
{
Printf("You must restart " GAMENAME " for this change to take effect.\n");
}
class LLVMProgram
{
@ -485,12 +493,22 @@ void LLVMProgram::CreateEE()
std::string errorstring;
std::string mcpu = sys::getHostCPUName();
if (std::string(CPU.CPUString).find("G840") && mcpu == "sandybridge")
mcpu = "westmere"; // Pentium G840 is misdetected as a sandy bridge CPU
if (stricmp(llvm_cpu, "auto") != 0)
{
mcpu = llvm_cpu;
Printf("Overriding LLVM CPU target to %s\n", mcpu.c_str());
}
llvm::Module *module = mModule.get();
EngineBuilder engineBuilder(std::move(mModule));
engineBuilder.setErrorStr(&errorstring);
engineBuilder.setOptLevel(CodeGenOpt::Aggressive);
engineBuilder.setEngineKind(EngineKind::JIT);
engineBuilder.setMCPU(sys::getHostCPUName());
engineBuilder.setMCPU(mcpu);
machine = engineBuilder.selectTarget();
if (!machine)
I_FatalError("Could not create LLVM target machine");