[llvm] r271936 - AMDGPU: Add function for getting instruction size
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Mon Jun 6 13:10:33 PDT 2016
Author: arsenm
Date: Mon Jun 6 15:10:33 2016
New Revision: 271936
URL: http://llvm.org/viewvc/llvm-project?rev=271936&view=rev
Log:
AMDGPU: Add function for getting instruction size
Modified:
llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp
llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.h
Modified: llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp?rev=271936&r1=271935&r2=271936&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp Mon Jun 6 15:10:33 2016
@@ -3116,6 +3116,55 @@ bool SIInstrInfo::isHighLatencyInstructi
return isMUBUF(Opc) || isMTBUF(Opc) || isMIMG(Opc);
}
+unsigned SIInstrInfo::getInstSizeInBytes(const MachineInstr &MI) const {
+ unsigned Opc = MI.getOpcode();
+ const MCInstrDesc &Desc = getMCOpcodeFromPseudo(Opc);
+ unsigned DescSize = Desc.getSize();
+
+ // If we have a definitive size, we can use it. Otherwise we need to inspect
+ // the operands to know the size.
+ if (DescSize == 8 || DescSize == 4)
+ return DescSize;
+
+ assert(DescSize == 0);
+
+ // 4-byte instructions may have a 32-bit literal encoded after them. Check
+ // operands that coud ever be literals.
+ if (isVALU(MI) || isSALU(MI)) {
+ int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
+ if (Src0Idx == -1)
+ return 4; // No operands.
+
+ if (isLiteralConstant(MI.getOperand(Src0Idx), getOpSize(MI, Src0Idx)))
+ return 8;
+
+ int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
+ if (Src1Idx == -1)
+ return 4;
+
+ if (isLiteralConstant(MI.getOperand(Src1Idx), getOpSize(MI, Src1Idx)))
+ return 8;
+
+ return 4;
+ }
+
+ switch (Opc) {
+ case TargetOpcode::IMPLICIT_DEF:
+ case TargetOpcode::KILL:
+ case TargetOpcode::DBG_VALUE:
+ case TargetOpcode::BUNDLE:
+ case TargetOpcode::EH_LABEL:
+ return 0;
+ case TargetOpcode::INLINEASM: {
+ const MachineFunction *MF = MI.getParent()->getParent();
+ const char *AsmStr = MI.getOperand(0).getSymbolName();
+ return getInlineAsmLength(AsmStr, *MF->getTarget().getMCAsmInfo());
+ }
+ default:
+ llvm_unreachable("unable to find instruction size");
+ }
+}
+
ArrayRef<std::pair<int, const char *>>
SIInstrInfo::getSerializableTargetIndices() const {
static const std::pair<int, const char *> TargetIndices[] = {
Modified: llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.h?rev=271936&r1=271935&r2=271936&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.h (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.h Mon Jun 6 15:10:33 2016
@@ -512,6 +512,8 @@ public:
return get(pseudoToMCOpcode(Opcode));
}
+ unsigned getInstSizeInBytes(const MachineInstr &MI) const;
+
ArrayRef<std::pair<int, const char *>>
getSerializableTargetIndices() const override;
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