aboutsummaryrefslogtreecommitdiff
path: root/lib/Target/Mips/MipsInstrInfo.cpp
diff options
context:
space:
mode:
authorAkira Hatanaka <ahatanaka@mips.com>2012-06-14 01:16:45 +0000
committerAkira Hatanaka <ahatanaka@mips.com>2012-06-14 01:16:45 +0000
commitd4b48b283c3939962f0cd3c17aedc40209d82b1a (patch)
treee32a6aeeccc67d90bea6297ae565e885ffd67a51 /lib/Target/Mips/MipsInstrInfo.cpp
parent4654e58a64b9d9b5eb93befc74ca7cfecaf52ce9 (diff)
Define function MipsInstrInfo::GetInstSizeInBytes, which will be called to
compute the size of basic blocks in a function. Also, define a function which emits a series of instructions to load an immediate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158429 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/Mips/MipsInstrInfo.cpp')
-rw-r--r--lib/Target/Mips/MipsInstrInfo.cpp56
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/Target/Mips/MipsInstrInfo.cpp b/lib/Target/Mips/MipsInstrInfo.cpp
index c01830d509..060e48d75c 100644
--- a/lib/Target/Mips/MipsInstrInfo.cpp
+++ b/lib/Target/Mips/MipsInstrInfo.cpp
@@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
+#include "MipsAnalyzeImmediate.h"
#include "MipsInstrInfo.h"
#include "MipsTargetMachine.h"
#include "MipsMachineFunction.h"
@@ -505,3 +506,58 @@ ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const
return false;
}
+/// Return the number of bytes of code the specified instruction may be.
+unsigned MipsInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
+ switch (MI->getOpcode()) {
+ default:
+ return MI->getDesc().getSize();
+ case TargetOpcode::INLINEASM: { // Inline Asm: Variable size.
+ const MachineFunction *MF = MI->getParent()->getParent();
+ const char *AsmStr = MI->getOperand(0).getSymbolName();
+ return getInlineAsmLength(AsmStr, *MF->getTarget().getMCAsmInfo());
+ }
+ }
+}
+
+unsigned
+llvm::Mips::loadImmediate(int64_t Imm, bool IsN64, const TargetInstrInfo &TII,
+ MachineBasicBlock& MBB,
+ MachineBasicBlock::iterator II, DebugLoc DL,
+ bool LastInstrIsADDiu,
+ MipsAnalyzeImmediate::Inst *LastInst) {
+ MipsAnalyzeImmediate AnalyzeImm;
+ unsigned Size = IsN64 ? 64 : 32;
+ unsigned LUi = IsN64 ? Mips::LUi64 : Mips::LUi;
+ unsigned ZEROReg = IsN64 ? Mips::ZERO_64 : Mips::ZERO;
+ unsigned ATReg = IsN64 ? Mips::AT_64 : Mips::AT;
+
+ const MipsAnalyzeImmediate::InstSeq &Seq =
+ AnalyzeImm.Analyze(Imm, Size, LastInstrIsADDiu);
+ MipsAnalyzeImmediate::InstSeq::const_iterator Inst = Seq.begin();
+
+ if (LastInst && (Seq.size() == 1)) {
+ *LastInst = *Inst;
+ return 0;
+ }
+
+ // The first instruction can be a LUi, which is different from other
+ // instructions (ADDiu, ORI and SLL) in that it does not have a register
+ // operand.
+ if (Inst->Opc == LUi)
+ BuildMI(MBB, II, DL, TII.get(LUi), ATReg)
+ .addImm(SignExtend64<16>(Inst->ImmOpnd));
+ else
+ BuildMI(MBB, II, DL, TII.get(Inst->Opc), ATReg).addReg(ZEROReg)
+ .addImm(SignExtend64<16>(Inst->ImmOpnd));
+
+ // Build the remaining instructions in Seq. Skip the last instruction if
+ // LastInst is not 0.
+ for (++Inst; Inst != Seq.end() - !!LastInst; ++Inst)
+ BuildMI(MBB, II, DL, TII.get(Inst->Opc), ATReg).addReg(ATReg)
+ .addImm(SignExtend64<16>(Inst->ImmOpnd));
+
+ if (LastInst)
+ *LastInst = *Inst;
+
+ return Seq.size() - !!LastInst;
+}