[Beignet] [PATCH V2 2/2] Implement spill/unspill
Song, Ruiling
ruiling.song at intel.com
Wed Aug 7 19:44:55 PDT 2013
Yes, reproduced. Maybe previously I only tried 70*32.
compiler_box_blur seems random failures on my side.
compiler_box_blur_float seems always fails.
I will check it now.
From: beignet-bounces+ruiling.song=intel.com at lists.freedesktop.org [mailto:beignet-bounces+ruiling.song=intel.com at lists.freedesktop.org] On Behalf Of zhigang gong
Sent: Thursday, August 08, 2013 7:46 AM
To: Song, Ruiling
Cc: beignet at lists.freedesktop.org
Subject: Re: [Beignet] [PATCH V2 2/2] Implement spill/unspill
Ruiling,
I just ran the utests with 4KB - 80*32 register size. And got the following failures:
compiler_box_blur_float:
compiler_box_blur_float() [FAILED]
Error: image mismatch
at file /home/gongzg/git/fdo/beignet/utests/compiler_box_blur_float.cpp, function compiler_box_blur_float, line 60
compiler_box_blur:
compiler_box_blur() [FAILED]
Error: image mismatch
at file /home/gongzg/git/fdo/beignet/utests/compiler_box_blur.cpp, function compiler_box_blur, line 39
And as 64bit data type is not supported, I can't finish all the unit test cases. There maybe some other failures not triggered..
Could you reproduce the same result on your environment?
On Wed, Aug 7, 2013 at 3:53 PM, Song, Ruiling <ruiling.song at intel.com<mailto:ruiling.song at intel.com>> wrote:
Yes, normally we need complex kernel to trigger spill/unspill. I have no idea of writing a test case to cover this.
But it is easy to test spill logic: change below line in backend/context.cpp
static const int16_t RegisterFileSize = 4*KB;
to something like:
static const int16_t RegisterFileSize = 4*KB - 80*32;
then run all the unit tests. I have not tried to spill all. As there are curbe entries. And you know there is still some limitations.
I will try some more aggressive value to spill more regs.
Thanks!
Ruiling
-----Original Message-----
From: beignet-bounces+ruiling.song=intel.com at lists.freedesktop.org<mailto:intel.com at lists.freedesktop.org> [mailto:beignet-bounces+ruiling.song<mailto:beignet-bounces%2Bruiling.song>=intel.com at lists.freedesktop.org<mailto:intel.com at lists.freedesktop.org>] On Behalf Of Zhigang Gong
Sent: Wednesday, August 07, 2013 3:32 PM
To: Song, Ruiling
Cc: beignet at lists.freedesktop.org<mailto:beignet at lists.freedesktop.org>
Subject: Re: [Beignet] [PATCH V2 2/2] Implement spill/unspill
This version LGTM, will push it latter. Really nice work to bring spill/unspill to Beinet, thanks.
Could you add some unit tests here to test both the spill/unspill and the scratch read/write?
You know we do need solid test case for spill/unspill. If there is some bugs hiding here, it will be extremly hard to find it when we met them in a real complicate kernel.
On Wed, Aug 07, 2013 at 03:15:50PM +0800, Ruiling Song wrote:
> The current implementation works like below:
> I reserve a pool of registers for spill/reload. Currently 6 registers
> are reserved to handle SelectionVector with at most 5 elements.
> The other one is used as scratch message header register. The register
> after header register was used as the payload for scratch write.
>
> To do spill, just iterate the instructions. If the virtual register
> was used as src, insert reload instruction before it. If the virtual
> register was used as dst, insert spill instruction to write the
> register content to scratch memory.
>
> Limitations yet:
> 64bit not support.
> SelectionVector > 5 not handled.
>
> Signed-off-by: Ruiling Song <ruiling.song at intel.com<mailto:ruiling.song at intel.com>>
> ---
> backend/src/backend/gen_context.cpp | 34 ++++++++++++
> backend/src/backend/gen_context.hpp | 2 +
> .../src/backend/gen_insn_gen7_schedule_info.hxx | 2 +
> backend/src/backend/gen_insn_scheduling.cpp | 39 +++++++++-----
> backend/src/backend/gen_insn_selection.cpp | 57 +++++++++++++++++++-
> backend/src/backend/gen_insn_selection.hpp | 6 +++
> backend/src/backend/gen_insn_selection.hxx | 2 +
> backend/src/backend/gen_reg_allocation.cpp | 56 +++++++++++++++++--
> 8 files changed, 180 insertions(+), 18 deletions(-)
>
> diff --git a/backend/src/backend/gen_context.cpp
> b/backend/src/backend/gen_context.cpp
> index 29fa1c3..ce83923 100644
> --- a/backend/src/backend/gen_context.cpp
> +++ b/backend/src/backend/gen_context.cpp
> @@ -542,6 +542,40 @@ namespace gbe
> p->pop();
> }
>
> + void GenContext::emitSpillRegInstruction(const SelectionInstruction &insn) {
> + uint32_t simdWidth = p->curr.execWidth;
> + uint32_t scratchOffset = insn.extra.scratchOffset;
> + const uint32_t header = insn.extra.scratchMsgHeader;
> + p->push();
> +
> + const GenRegister msg = GenRegister::ud8grf(header, 0);
> + const GenRegister src = ra->genReg(insn.src(0));
> + GenRegister payload = src;
> + payload.nr<http://payload.nr> = header + 1;
> + payload.subnr = 0;
> +
> + p->MOV(payload, src);
> + uint32_t regType = insn.src(0).type;
> + uint32_t size = typeSize(regType);
> + assert(size <= 4);
> + uint32_t regNum = (stride(src.hstride)*size*simdWidth) > 32 ? 2 : 1;
> + this->scratchWrite(msg, scratchOffset, regNum, regType, GEN_SCRATCH_CHANNEL_MODE_DWORD);
> + p->pop();
> + }
> +
> + void GenContext::emitUnSpillRegInstruction(const SelectionInstruction &insn) {
> + uint32_t scratchOffset = insn.extra.scratchOffset;
> + const GenRegister dst = insn.dst(0);
> + uint32_t regType = dst.type;
> + uint32_t simdWidth = p->curr.execWidth;
> + const uint32_t header = insn.extra.scratchMsgHeader;
> + uint32_t size = typeSize(regType);
> + assert(size <= 4);
> + uint32_t regNum = (stride(dst.hstride)*size*simdWidth) > 32 ? 2 : 1;
> + const GenRegister msg = GenRegister::ud8grf(header, 0);
> + this->scratchRead(GenRegister::retype(dst, GEN_TYPE_UD), msg,
> + scratchOffset, regNum, regType, GEN_SCRATCH_CHANNEL_MODE_DWORD); }
> +
> // For SIMD8, we allocate 2*elemNum temporary registers from dst(0), and
> // then follow the real destination registers.
> // For SIMD16, we allocate elemNum temporary registers from dst(0).
> diff --git a/backend/src/backend/gen_context.hpp
> b/backend/src/backend/gen_context.hpp
> index bcf0dc4..694ae98 100644
> --- a/backend/src/backend/gen_context.hpp
> +++ b/backend/src/backend/gen_context.hpp
> @@ -108,6 +108,8 @@ namespace gbe
> void emitByteScatterInstruction(const SelectionInstruction &insn);
> void emitSampleInstruction(const SelectionInstruction &insn);
> void emitTypedWriteInstruction(const SelectionInstruction &insn);
> + void emitSpillRegInstruction(const SelectionInstruction &insn);
> + void emitUnSpillRegInstruction(const SelectionInstruction &insn);
> void emitGetImageInfoInstruction(const SelectionInstruction &insn);
> void scratchWrite(const GenRegister header, uint32_t offset, uint32_t reg_num, uint32_t reg_type, uint32_t channel_mode);
> void scratchRead(const GenRegister dst, const GenRegister header,
> uint32_t offset, uint32_t reg_num, uint32_t reg_type, uint32_t
> channel_mode); diff --git
> a/backend/src/backend/gen_insn_gen7_schedule_info.hxx
> b/backend/src/backend/gen_insn_gen7_schedule_info.hxx
> index 6f37c3d..da8f2a2 100644
> --- a/backend/src/backend/gen_insn_gen7_schedule_info.hxx
> +++ b/backend/src/backend/gen_insn_gen7_schedule_info.hxx
> @@ -20,5 +20,7 @@ DECL_GEN7_SCHEDULE(ByteGather, 80, 1, 1)
> DECL_GEN7_SCHEDULE(ByteScatter, 80, 1, 1)
> DECL_GEN7_SCHEDULE(Sample, 80, 1, 1)
> DECL_GEN7_SCHEDULE(TypedWrite, 80, 1, 1)
> +DECL_GEN7_SCHEDULE(SpillReg, 80, 1, 1)
> +DECL_GEN7_SCHEDULE(UnSpillReg, 80, 1, 1)
> DECL_GEN7_SCHEDULE(GetImageInfo, 20, 4, 2)
> DECL_GEN7_SCHEDULE(Atomic, 80, 1, 1)
> diff --git a/backend/src/backend/gen_insn_scheduling.cpp
> b/backend/src/backend/gen_insn_scheduling.cpp
> index cb990be..0b720b7 100644
> --- a/backend/src/backend/gen_insn_scheduling.cpp
> +++ b/backend/src/backend/gen_insn_scheduling.cpp
> @@ -283,19 +283,24 @@ namespace gbe
> uint32_t DependencyTracker::getIndex(GenRegister reg) const {
> // Non GRF physical register
> if (reg.physical) {
> - GBE_ASSERT (reg.file == GEN_ARCHITECTURE_REGISTER_FILE);
> - const uint32_t file = reg.nr<http://reg.nr> & 0xf0;
> - const uint32_t nr = reg.nr<http://reg.nr> & 0x0f;
> - if (file == GEN_ARF_FLAG) {
> - const uint32_t subnr = reg.subnr / sizeof(uint16_t);
> - GBE_ASSERT(nr < MAX_FLAG_REGISTER && (subnr == 0 || subnr == 1));
> - return grfNum + 2*nr + subnr;
> - } else if (file == GEN_ARF_ACCUMULATOR) {
> - GBE_ASSERT(nr < MAX_ACC_REGISTER);
> - return grfNum + MAX_FLAG_REGISTER + nr;
> + //GBE_ASSERT (reg.file == GEN_ARCHITECTURE_REGISTER_FILE);
> + if(reg.file == GEN_ARCHITECTURE_REGISTER_FILE) {
> + const uint32_t file = reg.nr<http://reg.nr> & 0xf0;
> + const uint32_t nr = reg.nr<http://reg.nr> & 0x0f;
> + if (file == GEN_ARF_FLAG) {
> + const uint32_t subnr = reg.subnr / sizeof(uint16_t);
> + GBE_ASSERT(nr < MAX_FLAG_REGISTER && (subnr == 0 || subnr == 1));
> + return grfNum + 2*nr + subnr;
> + } else if (file == GEN_ARF_ACCUMULATOR) {
> + GBE_ASSERT(nr < MAX_ACC_REGISTER);
> + return grfNum + MAX_FLAG_REGISTER + nr;
> + } else {
> + NOT_SUPPORTED;
> + return 0;
> + }
> } else {
> - NOT_SUPPORTED;
> - return 0;
> + const uint32_t simdWidth = scheduler.ctx.getSimdWidth();
> + return simdWidth == 8 ? reg.nr<http://reg.nr> : reg.nr<http://reg.nr> / 2;
> }
> }
> // We directly manipulate physical GRFs here @@ -344,6 +349,10 @@
> namespace gbe
> this->nodes[index] = node;
> }
>
> + if(insn.opcode == SEL_OP_SPILL_REG) {
> + const uint32_t index = this->getIndex(0xff);
> + this->nodes[index] = node;
> + }
> // Consider barriers and wait write to memory
> if (insn.opcode == SEL_OP_BARRIER ||
> insn.opcode == SEL_OP_FENCE || @@ -424,6 +433,11 @@ namespace
> gbe
> const uint32_t index = tracker.getIndex(insn.extra.function);
> tracker.addDependency(node, index);
> }
> + //read-after-write of scratch memory
> + if (insn.opcode == SEL_OP_UNSPILL_REG) {
> + const uint32_t index = tracker.getIndex(0xff);
> + tracker.addDependency(node, index);
> + }
>
> // Consider barriers and wait are reading memory (local and global)
> if (insn.opcode == SEL_OP_BARRIER || @@ -453,6 +467,7 @@
> namespace gbe
> tracker.addDependency(node, index);
> }
>
> +
> // Consider barriers and wait are writing memory (local and global)
> if (insn.opcode == SEL_OP_BARRIER ||
> insn.opcode == SEL_OP_FENCE || diff --git
> a/backend/src/backend/gen_insn_selection.cpp
> b/backend/src/backend/gen_insn_selection.cpp
> index 7e9402d..3610051 100644
> --- a/backend/src/backend/gen_insn_selection.cpp
> +++ b/backend/src/backend/gen_insn_selection.cpp
> @@ -315,6 +315,8 @@ namespace gbe
> INLINE ir::Register replaceSrc(SelectionInstruction *insn, uint32_t regID);
> /*! Implement public class */
> INLINE ir::Register replaceDst(SelectionInstruction *insn,
> uint32_t regID);
> + /*! spill a register (insert spill/unspill instructions) */
> + INLINE void spillReg(ir::Register reg, uint32_t registerPool);
> /*! Implement public class */
> INLINE uint32_t getRegNum(void) const { return file.regNum(); }
> /*! Implements public interface */ @@ -617,6 +619,57 @@ namespace
> gbe
> return vector;
> }
>
> + void Selection::Opaque::spillReg(ir::Register spilledReg, uint32_t registerPool) {
> + assert(registerPool != 0);
> + const uint32_t simdWidth = ctx.getSimdWidth();
> + const uint32_t dstStart = registerPool + 1;
> + const uint32_t srcStart = registerPool + 1;
> + uint32_t ptr =
> + ctx.allocateScratchMem(typeSize(GEN_TYPE_D)*simdWidth);
> +
> + for (auto &block : blockList)
> + for (auto &insn : block.insnList) {
> + const uint32_t srcNum = insn.srcNum, dstNum = insn.dstNum;
> +
> + for (uint32_t srcID = 0; srcID < srcNum; ++srcID) {
> + const GenRegister selReg = insn.src(srcID);
> + const ir::Register reg = selReg.reg();
> + if(selReg.file == GEN_GENERAL_REGISTER_FILE && reg == spilledReg) {
> + GBE_ASSERT(srcID < 5);
> + SelectionInstruction *unspill = this->create(SEL_OP_UNSPILL_REG, 1, 0);
> + unspill->state = GenInstructionState(simdWidth);
> + unspill->dst(0) = GenRegister(GEN_GENERAL_REGISTER_FILE, srcStart+srcID, 0,
> + selReg.type, selReg.vstride, selReg.width, selReg.hstride);
> + GenRegister src = insn.src(srcID);
> + // change nr/subnr, keep other register settings
> + src.nr<http://src.nr> = srcStart+srcID; src.subnr=0; src.physical=1;
> + insn.src(srcID) = src;
> + unspill->extra.scratchOffset = ptr;
> + unspill->extra.scratchMsgHeader = registerPool;
> + insn.prepend(*unspill);
> + }
> + }
> +
> + for (uint32_t dstID = 0; dstID < dstNum; ++dstID) {
> + const GenRegister selReg = insn.dst(dstID);
> + const ir::Register reg = selReg.reg();
> + if(selReg.file == GEN_GENERAL_REGISTER_FILE && reg == spilledReg) {
> + GBE_ASSERT(dstID < 5);
> + SelectionInstruction *spill = this->create(SEL_OP_SPILL_REG, 0, 1);
> + spill->state = GenInstructionState(simdWidth);
> + spill->src(0) =GenRegister(GEN_GENERAL_REGISTER_FILE, dstStart + dstID, 0,
> + selReg.type, selReg.vstride, selReg.width, selReg.hstride);
> + GenRegister dst = insn.dst(dstID);
> + // change nr/subnr, keep other register settings
> + dst.physical =1; dst.nr<http://dst.nr> = dstStart+dstID; dst.subnr = 0;
> + insn.dst(dstID)= dst;
> + spill->extra.scratchOffset = ptr;
> + spill->extra.scratchMsgHeader = registerPool;
> + insn.append(*spill);
> + }
> + }
> + }
> + }
> +
> ir::Register Selection::Opaque::replaceSrc(SelectionInstruction *insn, uint32_t regID) {
> SelectionBlock *block = insn->parent;
> const uint32_t simdWidth = ctx.getSimdWidth(); @@ -820,7 +873,6
> @@ namespace gbe
> dstVector->regNum = elemNum;
> dstVector->isSrc = 0;
> dstVector->reg = &insn->dst(0);
> -
> // Source cannot be scalar (yet)
> srcVector->regNum = 1;
> srcVector->isSrc = 1;
> @@ -1188,6 +1240,9 @@ namespace gbe
> ir::Register Selection::replaceDst(SelectionInstruction *insn, uint32_t regID) {
> return this->opaque->replaceDst(insn, regID);
> }
> + void Selection::spillReg(ir::Register reg, uint32_t registerPool) {
> + this->opaque->spillReg(reg, registerPool); }
>
> SelectionInstruction *Selection::create(SelectionOpcode opcode, uint32_t dstNum, uint32_t srcNum) {
> return this->opaque->create(opcode, dstNum, srcNum); diff --git
> a/backend/src/backend/gen_insn_selection.hpp
> b/backend/src/backend/gen_insn_selection.hpp
> index 5ae6e42..79b73e2 100644
> --- a/backend/src/backend/gen_insn_selection.hpp
> +++ b/backend/src/backend/gen_insn_selection.hpp
> @@ -107,6 +107,10 @@ namespace gbe
> /*! offset (0 to 7) */
> uint16_t offset:5;
> };
> + struct {
> + uint16_t scratchOffset;
> + uint16_t scratchMsgHeader;
> + };
> } extra;
> /*! Gen opcode */
> uint8_t opcode;
> @@ -197,6 +201,8 @@ namespace gbe
> ir::Register replaceSrc(SelectionInstruction *insn, uint32_t regID);
> /*! Replace a destination to the returned temporary register */
> ir::Register replaceDst(SelectionInstruction *insn, uint32_t
> regID);
> + /*! spill a register (insert spill/unspill instructions) */
> + void spillReg(ir::Register reg, uint32_t registerPool);
> /*! Create a new selection instruction */
> SelectionInstruction *create(SelectionOpcode, uint32_t dstNum, uint32_t srcNum);
> /*! List of emitted blocks */
> diff --git a/backend/src/backend/gen_insn_selection.hxx
> b/backend/src/backend/gen_insn_selection.hxx
> index 7664c8f..495978f 100644
> --- a/backend/src/backend/gen_insn_selection.hxx
> +++ b/backend/src/backend/gen_insn_selection.hxx
> @@ -48,6 +48,8 @@ DECL_SELECTION_IR(BYTE_SCATTER,
> ByteScatterInstruction) DECL_SELECTION_IR(SAMPLE, SampleInstruction)
> DECL_SELECTION_IR(TYPED_WRITE, TypedWriteInstruction)
> DECL_SELECTION_IR(GET_IMAGE_INFO, GetImageInfoInstruction)
> +DECL_SELECTION_IR(SPILL_REG, SpillRegInstruction)
> +DECL_SELECTION_IR(UNSPILL_REG, UnSpillRegInstruction)
> DECL_SELECTION_IR(MUL_HI, TernaryInstruction) DECL_SELECTION_IR(FBH,
> UnaryInstruction) DECL_SELECTION_IR(FBL, UnaryInstruction) diff --git
> a/backend/src/backend/gen_reg_allocation.cpp
> b/backend/src/backend/gen_reg_allocation.cpp
> index 4ba03ea..ccbc0da 100644
> --- a/backend/src/backend/gen_reg_allocation.cpp
> +++ b/backend/src/backend/gen_reg_allocation.cpp
> @@ -31,6 +31,8 @@
> #include <algorithm>
> #include <climits>
>
> +#define RESERVED_REG_NUM_FOR_SPILL 6
> +
> namespace gbe
> {
>
> //////////////////////////////////////////////////////////////////////
> ///////
> @@ -94,6 +96,10 @@ namespace gbe
> vector<GenRegInterval*> starting;
> /*! Intervals sorting based on ending point positions */
> vector<GenRegInterval*> ending;
> + /*! registers that are spilled */
> + set<ir::Register> spilled;
> + /* reserved registers for register spill/reload */
> + uint32_t reservedReg;
> /*! Current vector to expire */
> uint32_t expiringID;
> /*! Use custom allocator */
> @@ -259,6 +265,11 @@ namespace gbe
> continue;
> }
>
> + //ignore register that already spilled
> + if(spilled.contains(reg)) {
> + this->expiringID++;
> + continue;
> + }
> // Ignore booleans that were allocated with flags
> // if (ctx.getRegisterFamily(reg) == ir::FAMILY_BOOL && !grfBooleans.contains(reg)) {
> if (ctx.sel->getRegisterFamily(reg) == ir::FAMILY_BOOL) { @@
> -473,6 +484,9 @@ namespace gbe
> auto it = vectorMap.find(reg);
> if (it != vectorMap.end()) {
> const SelectionVector *vector = it->second.first;
> + // all the reg in the SelectionVector are spilled
> + if(spilled.contains(vector->reg[0].reg()))
> + continue;
> const uint32_t simdWidth = ctx.getSimdWidth();
>
> const ir::RegisterData regData =
> ctx.sel->getRegisterData(reg); @@ -481,10 +495,28 @@ namespace gbe
> const uint32_t alignment = simdWidth*typeSize;
>
> const uint32_t size = vector->regNum * alignment;
> +
> uint32_t grfOffset;
> while ((grfOffset = ctx.allocate(size, alignment)) == 0) {
> const bool success = this->expireGRF(interval);
> - if (success == false) return false;
> + if (success == false) {
> + // if no spill support, just return false, else simply spill the register
> + if(reservedReg == 0) return false;
> + break;
> + }
> + }
> + if(grfOffset == 0) {
> + // spill all the registers in the SelectionVector
> + // the tricky here is I need to use reservedReg+1 as scratch write payload.
> + // so, i need to write the first register to scratch memory first.
> + // the spillReg() will just append scratch write insn after the def. To spill
> + // the first register, need to call spillReg() last for the vector->reg[0]
> + GBE_ASSERT(vector->regNum < RESERVED_REG_NUM_FOR_SPILL);
> + for(int i = vector->regNum-1; i >= 0; i--) {
> + spilled.insert(vector->reg[i].reg());
> + selection.spillReg(vector->reg[i].reg(), reservedReg);
> + }
> + continue;
> }
> for (uint32_t regID = 0; regID < vector->regNum; ++regID, grfOffset += alignment) {
> const ir::Register reg = vector->reg[regID].reg(); @@
> -494,18 +526,25 @@ namespace gbe
> }
> }
> // Case 2: This is a regular scalar register, allocate it alone
> - else if (this->createGenReg(interval) == false)
> - return false;
> + else if (this->createGenReg(interval) == false) {
> + if(reservedReg == 0) return false;
> + spilled.insert(reg);
> + selection.spillReg(reg, reservedReg);
> + }
> }
> return true;
> }
> -
> INLINE bool GenRegAllocator::Opaque::allocate(Selection &selection) {
> using namespace ir;
> const Kernel *kernel = ctx.getKernel();
> const Function &fn = ctx.getFunction();
> GBE_ASSERT(fn.getProfile() == PROFILE_OCL);
> -
> + if (ctx.getSimdWidth() == 8) {
> + reservedReg = ctx.allocate(RESERVED_REG_NUM_FOR_SPILL * GEN_REG_SIZE, GEN_REG_SIZE);
> + reservedReg /= GEN_REG_SIZE;
> + } else {
> + reservedReg = 0;
> + }
> // Allocate all the vectors first since they need to be contiguous
> this->allocateVector(selection);
> // schedulePreRegAllocation(ctx, selection); @@ -690,6 +729,10 @@
> namespace gbe
> int subreg = offst % 8;
> std::cout << "%" << vReg << " g" << reg << "." << subreg << "D" << std::endl;
> }
> + std::set<ir::Register>::iterator is;
> + std::cout << "## spilled registers:" << std::endl;
> + for(is = spilled.begin(); is != spilled.end(); is++)
> + std::cout << (int)*is << std::endl;
> std::cout << std::endl;
> }
>
> @@ -704,6 +747,9 @@ namespace gbe
>
> INLINE GenRegister GenRegAllocator::Opaque::genReg(const GenRegister ®) {
> if (reg.file == GEN_GENERAL_REGISTER_FILE) {
> + if(reg.physical == 1) {
> + return reg;
> + }
> GBE_ASSERT(RA.contains(reg.reg()) != false);
> const uint32_t grfOffset = RA.find(reg.reg())->second;
> const GenRegister dst = setGenReg(reg, grfOffset);
> --
> 1.7.9.5
>
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