Add an option to use a virtual register as the global base register instead of
reserving a physical register ($gp or $28) for that purpose.
This will completely eliminate loads that restore the value of $gp after every
function call, if the register allocator assigns a callee-saved register, or
eliminate unnecessary loads if it assigns a temporary register.
example:
.cpload $25 // set $gp.
...
.cprestore 16 // store $gp to stack slot 16($sp).
...
jalr $25 // function call. clobbers $gp.
lw $gp, 16($sp) // not emitted if callee-saved reg is chosen.
...
lw $2, 4($gp)
...
jalr $25 // function call.
lw $gp, 16($sp) // not emitted if $gp is not live after this instruction.
...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151402 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsMachineFunction.cpp b/lib/Target/Mips/MipsMachineFunction.cpp
index 229dd02..ebbafc3 100644
--- a/lib/Target/Mips/MipsMachineFunction.cpp
+++ b/lib/Target/Mips/MipsMachineFunction.cpp
@@ -8,7 +8,43 @@
//===----------------------------------------------------------------------===//
#include "MipsMachineFunction.h"
+#include "MipsInstrInfo.h"
+#include "MipsSubtarget.h"
+#include "MCTargetDesc/MipsBaseInfo.h"
+#include "llvm/Function.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/Support/CommandLine.h"
using namespace llvm;
+static cl::opt<bool>
+FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
+ cl::desc("Always use $gp as the global base register."));
+
+bool MipsFunctionInfo::globalBaseRegFixed() const {
+ return FixGlobalBaseReg;
+}
+
+bool MipsFunctionInfo::globalBaseRegSet() const {
+ return GlobalBaseReg;
+}
+
+unsigned MipsFunctionInfo::getGlobalBaseReg() {
+ // Return if it has already been initialized.
+ if (GlobalBaseReg)
+ return GlobalBaseReg;
+
+ const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
+
+ if (FixGlobalBaseReg) // $gp is the global base register.
+ return GlobalBaseReg = ST.isABI_N64() ? Mips::GP_64 : Mips::GP;
+
+ const TargetRegisterClass *RC;
+ RC = ST.isABI_N64() ?
+ Mips::CPU64RegsRegisterClass : Mips::CPURegsRegisterClass;
+
+ return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
+}
+
void MipsFunctionInfo::anchor() { }