diff options
Diffstat (limited to 'src/gallium/drivers/radeon/R600LowerInstructions.cpp')
| -rw-r--r-- | src/gallium/drivers/radeon/R600LowerInstructions.cpp | 546 |
1 files changed, 546 insertions, 0 deletions
diff --git a/src/gallium/drivers/radeon/R600LowerInstructions.cpp b/src/gallium/drivers/radeon/R600LowerInstructions.cpp new file mode 100644 index 0000000000..b9f9c7cdb4 --- /dev/null +++ b/src/gallium/drivers/radeon/R600LowerInstructions.cpp @@ -0,0 +1,546 @@ +//===-- R600LowerInstructions.cpp - TODO: Add brief description -------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// TODO: Add full description +// +//===----------------------------------------------------------------------===// + +#include "AMDGPU.h" +#include "AMDGPUInstrInfo.h" +#include "AMDGPUUtil.h" +#include "AMDIL.h" +#include "AMDILMachineFunctionInfo.h" +#include "AMDILRegisterInfo.h" +#include "R600InstrInfo.h" +#include "llvm/CodeGen/MachineFunctionPass.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/Constants.h" +#include "llvm/Target/TargetInstrInfo.h" + +#include <stdio.h> + +using namespace llvm; + +namespace { + class R600LowerInstructionsPass : public MachineFunctionPass { + + private: + static char ID; + TargetMachine &TM; + AMDILMachineFunctionInfo * MFI; + const R600InstrInfo * TII; + MachineRegisterInfo * MRI; + + void lowerFLT(MachineInstr &MI); + + void calcAddress(const MachineOperand &ptrOp, + const MachineOperand &indexOp, + unsigned indexReg, + MachineBasicBlock &MBB, + MachineBasicBlock::iterator I) const; + + void divMod(MachineInstr &MI, + MachineBasicBlock &MBB, + MachineBasicBlock::iterator I, + bool div = true) const; + + public: + R600LowerInstructionsPass(TargetMachine &tm) : + MachineFunctionPass(ID), TM(tm), + TII(static_cast<const R600InstrInfo*>(tm.getInstrInfo())), + MRI(NULL) + { } + + const char *getPassName() const { return "R600 Lower Instructions"; } + virtual bool runOnMachineFunction(MachineFunction &MF); + + }; +} /* End anonymous namespace */ + +char R600LowerInstructionsPass::ID = 0; + +FunctionPass *llvm::createR600LowerInstructionsPass(TargetMachine &tm) { + return new R600LowerInstructionsPass(tm); +} + +bool R600LowerInstructionsPass::runOnMachineFunction(MachineFunction &MF) +{ + MRI = &MF.getRegInfo(); + MFI = MF.getInfo<AMDILMachineFunctionInfo>(); + + for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end(); + BB != BB_E; ++BB) { + MachineBasicBlock &MBB = *BB; + for (MachineBasicBlock::iterator I = MBB.begin(), Next = llvm::next(I); + I != MBB.end(); I = Next, Next = llvm::next(I) ) { + + MachineInstr &MI = *I; + switch(MI.getOpcode()) { + case AMDIL::FLT: + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(AMDIL::FGE)) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(2)) + .addOperand(MI.getOperand(1)); + break; + + case AMDIL::ABS_i32: + { + unsigned setgt = MRI->createVirtualRegister( + &AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SETGE_INT), + setgt) + .addOperand(MI.getOperand(1)) + .addReg(AMDIL::ZERO); + + unsigned add_int = MRI->createVirtualRegister( + &AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::ADD_INT), + add_int) + .addReg(setgt) + .addOperand(MI.getOperand(1)); + + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::XOR_INT)) + .addOperand(MI.getOperand(0)) + .addReg(setgt) + .addReg(add_int); + + break; + } + + /* XXX: We could propagate the ABS flag to all of the uses of Operand0 and + * remove the ABS instruction.*/ + case AMDIL::FABS_f32: + case AMDIL::ABS_f32: + MI.getOperand(1).addTargetFlag(MO_FLAG_ABS); + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(AMDIL::MOVE_f32)) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)); + break; + + case AMDIL::BINARY_OR_f32: + { + unsigned tmp0 = MRI->createVirtualRegister(&AMDIL::GPRI32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(AMDIL::FTOI), tmp0) + .addOperand(MI.getOperand(1)); + unsigned tmp1 = MRI->createVirtualRegister(&AMDIL::GPRI32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(AMDIL::FTOI), tmp1) + .addOperand(MI.getOperand(2)); + unsigned tmp2 = MRI->createVirtualRegister(&AMDIL::GPRI32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(AMDIL::BINARY_OR_i32), tmp2) + .addReg(tmp0) + .addReg(tmp1); + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(AMDIL::ITOF), MI.getOperand(0).getReg()) + .addReg(tmp2); + break; + } + case AMDIL::CMOVLOG_f32: + BuildMI(MBB, I, MBB.findDebugLoc(I), TM.getInstrInfo()->get(MI.getOpcode())) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)) + .addOperand(MI.getOperand(3)) + .addOperand(MI.getOperand(2)); + break; + + case AMDIL::CMOVLOG_i32: + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::CNDE_INT)) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)) + .addOperand(MI.getOperand(3)) + .addOperand(MI.getOperand(2)); + break; + + case AMDIL::CLAMP_f32: + { + MachineOperand lowOp = MI.getOperand(2); + MachineOperand highOp = MI.getOperand(3); + if (lowOp.isReg() && highOp.isReg() + && lowOp.getReg() == AMDIL::ZERO && highOp.getReg() == AMDIL::ONE) { + MI.getOperand(0).addTargetFlag(MO_FLAG_CLAMP); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::MOV)) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)); + } else { + /* XXX: Handle other cases */ + abort(); + } + break; + } + + case AMDIL::UDIV_i32: + divMod(MI, MBB, I); + break; + + /* XXX: Figure out the semantics of DIV_INF_f32 and make sure this is OK */ +/* case AMDIL::DIV_INF_f32: + { + unsigned tmp0 = MRI->createVirtualRegister(&AMDIL::GPRF32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), + TM.getInstrInfo()->get(AMDIL::RECIP_CLAMPED), tmp0) + .addOperand(MI.getOperand(2)); + BuildMI(MBB, I, MBB.findDebugLoc(I), + TM.getInstrInfo()->get(AMDIL::MUL_IEEE_f32)) + .addOperand(MI.getOperand(0)) + .addReg(tmp0) + .addOperand(MI.getOperand(1)); + break; + } +*/ /* XXX: This is an optimization */ + + case AMDIL::GLOBALLOAD_f32: + case AMDIL::GLOBALLOAD_i32: + { + MachineOperand &ptrOperand = MI.getOperand(1); + MachineOperand &indexOperand = MI.getOperand(2); + unsigned indexReg = + MRI->createVirtualRegister(&AMDIL::R600_TReg32_XRegClass); + + /* Calculate the address with in the VTX buffer */ + calcAddress(ptrOperand, indexOperand, indexReg, MBB, I); + + /* Make sure the VTX_READ_eg writes to the X chan */ + MRI->setRegClass(MI.getOperand(0).getReg(), + &AMDIL::R600_TReg32_XRegClass); + + /* Add the VTX_READ_eg instruction */ + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(AMDIL::VTX_READ_eg)) + .addOperand(MI.getOperand(0)) + .addReg(indexReg) + .addImm(1); + break; + } + + case AMDIL::GLOBALSTORE_i32: + case AMDIL::GLOBALSTORE_f32: + { + MachineOperand &ptrOperand = MI.getOperand(1); + MachineOperand &indexOperand = MI.getOperand(2); + unsigned rwReg = + MRI->createVirtualRegister(&AMDIL::R600_TReg32_XRegClass); + unsigned byteIndexReg = + MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + unsigned shiftReg = + MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + unsigned indexReg = + MRI->createVirtualRegister(&AMDIL::R600_TReg32_XRegClass); + + /* Move the store value to the correct register class */ + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::COPY), rwReg) + .addOperand(MI.getOperand(0)); + + /* Calculate the address in the RAT */ + calcAddress(ptrOperand, indexOperand, byteIndexReg, MBB, I); + + + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::MOV), shiftReg) + .addReg(AMDIL::ALU_LITERAL_X) + .addImm(2); + + /* XXX: Check GPU family */ + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(AMDIL::LSHR_eg), indexReg) + .addReg(byteIndexReg) + .addReg(shiftReg); + + /* XXX: Check GPU Family */ + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(AMDIL::RAT_WRITE_CACHELESS_eg)) + .addReg(rwReg) + .addReg(indexReg) + .addImm(0); + break; + } + case AMDIL::ILT: + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SETGT_INT)) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(2)) + .addOperand(MI.getOperand(1)); + break; + case AMDIL::LOADCONST_f32: + case AMDIL::LOADCONST_i32: + { + bool canInline = false; + unsigned inlineReg; + MachineOperand & dstOp = MI.getOperand(0); + MachineOperand & immOp = MI.getOperand(1); + if (immOp.isFPImm()) { + const ConstantFP * cfp = immOp.getFPImm(); + if (cfp->isZero()) { + canInline = true; + inlineReg = AMDIL::ZERO; + } else if (cfp->isExactlyValue(1.0f)) { + canInline = true; + inlineReg = AMDIL::ONE; + } else if (cfp->isExactlyValue(0.5f)) { + canInline = true; + inlineReg = AMDIL::HALF; + } + } + + if (canInline) { + MachineOperand * use = dstOp.getNextOperandForReg(); + /* The lowering operation for CLAMP needs to have the immediates + * as operands, so we must propagate them. */ + while (use) { + MachineOperand * next = use->getNextOperandForReg(); + if (use->getParent()->getOpcode() == AMDIL::CLAMP_f32) { + use->setReg(inlineReg); + } + use = next; + } + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::COPY)) + .addOperand(dstOp) + .addReg(inlineReg); + } else { + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::MOV)) + .addOperand(dstOp) + .addReg(AMDIL::ALU_LITERAL_X) + .addOperand(immOp); + } + break; + } + + case AMDIL::MASK_WRITE: + { + unsigned maskedRegister = MI.getOperand(0).getReg(); + assert(TargetRegisterInfo::isVirtualRegister(maskedRegister)); + MachineInstr * defInstr = MRI->getVRegDef(maskedRegister); + MachineOperand * def = defInstr->findRegisterDefOperand(maskedRegister); + def->addTargetFlag(MO_FLAG_MASK); + break; + } + + case AMDIL::VEXTRACT_v4f32: + MI.getOperand(2).setImm(MI.getOperand(2).getImm() - 1); + continue; + + case AMDIL::NEGATE_i32: + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SUB_INT)) + .addOperand(MI.getOperand(0)) + .addReg(AMDIL::ZERO) + .addOperand(MI.getOperand(1)); + break; + + case AMDIL::NEG_f32: + { + MI.getOperand(1).addTargetFlag(MO_FLAG_NEG); + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(TII->getISAOpcode(AMDIL::MOV))) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)); + break; + } + + case AMDIL::SUB_f32: + { + MI.getOperand(2).addTargetFlag(MO_FLAG_NEG); + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(TII->getISAOpcode(AMDIL::ADD_f32))) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)) + .addOperand(MI.getOperand(2)); + break; + } + + case AMDIL::VINSERT_v4f32: + { + + int64_t swz = MI.getOperand(4).getImm(); + int64_t chan; + switch (swz) { + case (1 << 0): + chan = 0; + break; + case (1 << 8): + chan = 1; + break; + case (1 << 16): + chan = 2; + break; + case (1 << 24): + chan = 3; + break; + default: + chan = 0; + fprintf(stderr, "swizzle: %ld\n", swz); + abort(); + break; + } + BuildMI(MBB, I, MBB.findDebugLoc(I), + TM.getInstrInfo()->get(AMDIL::SET_CHAN)) + .addOperand(MI.getOperand(1)) + .addOperand(MI.getOperand(2)) + .addImm(chan); + + BuildMI(MBB, I, MBB.findDebugLoc(I), + TM.getInstrInfo()->get(AMDIL::COPY)) + .addOperand(MI.getOperand(0)) + .addOperand(MI.getOperand(1)); + break; + } + + default: + continue; + } + MI.eraseFromParent(); + } + } + return false; +} + +void R600LowerInstructionsPass::calcAddress(const MachineOperand &ptrOp, + const MachineOperand &indexOp, + unsigned indexReg, + MachineBasicBlock &MBB, + MachineBasicBlock::iterator I) const +{ + /* Optimize the case where the indexOperand is 0 */ + if (indexOp.isImm() && indexOp.getImm() == 0) { + assert(ptrOp.isReg()); + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(AMDIL::COPY), indexReg) + .addOperand(ptrOp); + } else { + BuildMI(MBB, I, MBB.findDebugLoc(I), + TII->get(AMDIL::ADD_INT), indexReg) + .addOperand(indexOp) + .addOperand(ptrOp); + } +} + +/* Mostly copied from tgsi_divmod() in r600_shader.c */ +void R600LowerInstructionsPass::divMod(MachineInstr &MI, + MachineBasicBlock &MBB, + MachineBasicBlock::iterator I, + bool div) const +{ + unsigned dst = MI.getOperand(0).getReg(); + MachineOperand &numerator = MI.getOperand(1); + MachineOperand &denominator = MI.getOperand(2); + /* rcp = RECIP(denominator) = 2^32 / denominator + e + * e is rounding error */ + unsigned rcp = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(TII->getRECIP_UINT()), rcp) + .addOperand(denominator); + + /* rcp_lo = lo(rcp * denominator) */ + unsigned rcp_lo = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(TII->getMULLO_UINT()), rcp_lo) + .addReg(rcp) + .addOperand(denominator); + + /* rcp_hi = HI (rcp * denominator) */ + unsigned rcp_hi = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(TII->getMULHI_UINT()), rcp_hi) + .addReg(rcp) + .addOperand(denominator); + + unsigned neg_rcp_lo = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SUB_INT), neg_rcp_lo) + .addReg(AMDIL::ZERO) + .addReg(rcp_lo); + + unsigned abs_rcp_lo = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::CNDE_INT), abs_rcp_lo) + .addReg(rcp_hi) + .addReg(neg_rcp_lo) + .addReg(rcp_lo); + + unsigned e = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(TII->getMULHI_UINT()), e) + .addReg(abs_rcp_lo) + .addReg(rcp); + + unsigned rcp_plus_e = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::ADD_INT), rcp_plus_e) + .addReg(rcp) + .addReg(e); + + unsigned rcp_sub_e = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SUB_INT), rcp_sub_e) + .addReg(rcp) + .addReg(e); + + /* tmp0 = rcp_hi == 0 ? rcp_plus_e : rcp_sub_e */ + unsigned tmp0 = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::CNDE_INT), tmp0) + .addReg(rcp_hi) + .addReg(rcp_plus_e) + .addReg(rcp_sub_e); + + unsigned q = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(TII->getMULHI_UINT()), q) + .addReg(tmp0) + .addOperand(numerator); + + /* num_sub_r = q * denominator */ + unsigned num_sub_r = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(TII->getMULLO_UINT()), + num_sub_r) + .addReg(q) + .addOperand(denominator); + + unsigned r = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SUB_INT), r) + .addOperand(numerator) + .addReg(num_sub_r); + + unsigned r_ge_den = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SETGE_INT), r_ge_den) + .addReg(r) + .addOperand(denominator); + + unsigned r_ge_zero = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SETGE_INT), r_ge_zero) + .addOperand(numerator) + .addReg(num_sub_r); + + unsigned tmp1 = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::AND_INT), tmp1) + .addReg(r_ge_den) + .addReg(r_ge_zero); + + unsigned val0 = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + unsigned val1 = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + unsigned result = MRI->createVirtualRegister(&AMDIL::R600_TReg32RegClass); + if (div) { + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::ADD_INT), val0) + .addReg(q) + .addReg(AMDIL::ONE_INT); + + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SUB_INT), val1) + .addReg(q) + .addReg(AMDIL::ONE_INT); + + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::CNDE_INT), result) + .addReg(tmp1) + .addReg(q) + .addReg(val0); + } else { + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::SUB_INT), val0) + .addReg(r) + .addOperand(denominator); + + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::ADD_INT), val1) + .addReg(r) + .addOperand(denominator); + + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::CNDE_INT), result) + .addReg(tmp1) + .addReg(r) + .addReg(val0); + } + + /* XXX: Do we need to set to MAX_INT if denominator is 0? */ + BuildMI(MBB, I, MBB.findDebugLoc(I), TII->get(AMDIL::CNDE_INT), dst) + .addReg(r_ge_zero) + .addReg(val1) + .addReg(result); +} |