[Beignet] [PATCH 5/5] BDW: Add class Gen8Context.

[Yang Rong]

Now Gen8Context is almost same as Gen75Context, but still derive Gen8Context from GenContext for clearly.

Signed-off-by: Yang Rong <rong.r.yang at intel.com>
---
 backend/src/CMakeLists.txt           |   2 +
 backend/src/backend/gen8_context.cpp | 113 +++++++++++++++++++++++++++++++++++
 backend/src/backend/gen8_context.hpp |  63 +++++++++++++++++++
 backend/src/backend/gen_program.cpp  |   3 +
 4 files changed, 181 insertions(+)
 create mode 100644 backend/src/backend/gen8_context.cpp
 create mode 100644 backend/src/backend/gen8_context.hpp

diff --git a/backend/src/CMakeLists.txt b/backend/src/CMakeLists.txt
index 2daa630..c5d388e 100644
--- a/backend/src/CMakeLists.txt
+++ b/backend/src/CMakeLists.txt
@@ -96,6 +96,8 @@ set (GBE_SRC
     backend/gen_context.cpp
     backend/gen75_context.hpp
     backend/gen75_context.cpp
+    backend/gen8_context.hpp
+    backend/gen8_context.cpp
     backend/gen_program.cpp
     backend/gen_program.hpp
     backend/gen_program.h
diff --git a/backend/src/backend/gen8_context.cpp b/backend/src/backend/gen8_context.cpp
new file mode 100644
index 0000000..a9914f6
--- /dev/null
+++ b/backend/src/backend/gen8_context.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * \file gen8_context.cpp
+ */
+
+#include "backend/gen8_context.hpp"
+#include "backend/gen8_encoder.hpp"
+#include "backend/gen_program.hpp"
+#include "backend/gen_defs.hpp"
+#include "backend/gen_encoder.hpp"
+#include "backend/gen_insn_selection.hpp"
+#include "backend/gen_insn_scheduling.hpp"
+#include "backend/gen_reg_allocation.hpp"
+#include "sys/cvar.hpp"
+#include "ir/function.hpp"
+#include "ir/value.hpp"
+#include <cstring>
+
+namespace gbe
+{
+  void Gen8Context::emitSLMOffset(void) {
+    if(kernel->getUseSLM() == false)
+      return;
+
+    const GenRegister slm_offset = ra->genReg(GenRegister::ud1grf(ir::ocl::slmoffset));
+    const GenRegister slm_index = GenRegister::ud1grf(0, 0);
+    //the slm index is hold in r0.0 24-27 bit, in 4K unit, shift left 12 to get byte unit
+    p->push();
+      p->curr.execWidth = 1;
+      p->curr.predicate = GEN_PREDICATE_NONE;
+      p->SHR(slm_offset, slm_index, GenRegister::immud(12));
+    p->pop();
+  }
+
+  void Gen8Context::allocSLMOffsetCurbe(void) {
+    if(fn.getUseSLM())
+      allocCurbeReg(ir::ocl::slmoffset, GBE_CURBE_SLM_OFFSET);
+  }
+
+  uint32_t Gen8Context::alignScratchSize(uint32_t size){
+    if(size == 0)
+      return 0;
+    uint32_t i = 2048;
+    while(i < size) i *= 2;
+    return i;
+  }
+
+  void Gen8Context::emitStackPointer(void) {
+    using namespace ir;
+
+    // Only emit stack pointer computation if we use a stack
+    if (kernel->getCurbeOffset(GBE_CURBE_STACK_POINTER, 0) <= 0)
+      return;
+
+    // Check that everything is consistent in the kernel code
+    const uint32_t perLaneSize = kernel->getStackSize();
+    const uint32_t perThreadSize = perLaneSize * this->simdWidth;
+    GBE_ASSERT(perLaneSize > 0);
+    GBE_ASSERT(isPowerOf<2>(perLaneSize) == true);
+    GBE_ASSERT(isPowerOf<2>(perThreadSize) == true);
+
+    // Use shifts rather than muls which are limited to 32x16 bit sources
+    const uint32_t perLaneShift = logi2(perLaneSize);
+    const uint32_t perThreadShift = logi2(perThreadSize);
+    const GenRegister selStatckPtr = this->simdWidth == 8 ?
+      GenRegister::ud8grf(ir::ocl::stackptr) :
+      GenRegister::ud16grf(ir::ocl::stackptr);
+    const GenRegister stackptr = ra->genReg(selStatckPtr);
+    const GenRegister selStackBuffer = GenRegister::ud1grf(ir::ocl::stackbuffer);
+    const GenRegister bufferptr = ra->genReg(selStackBuffer);
+
+    // We compute the per-lane stack pointer here
+    p->push();
+      p->curr.execWidth = 1;
+      p->curr.predicate = GEN_PREDICATE_NONE;
+      //p->AND(GenRegister::ud1grf(126,0), GenRegister::ud1grf(0,5), GenRegister::immud(0x1ff));
+      p->AND(GenRegister::ud1grf(126,0), GenRegister::ud1grf(0,5), GenRegister::immud(0x7f));
+      p->AND(GenRegister::ud1grf(126,4), GenRegister::ud1grf(0,5), GenRegister::immud(0x180));
+      p->SHR(GenRegister::ud1grf(126,4), GenRegister::ud1grf(126, 4), GenRegister::immud(7));
+      p->curr.execWidth = this->simdWidth;
+      p->SHL(stackptr, stackptr, GenRegister::immud(perLaneShift));
+      p->curr.execWidth = 1;
+      p->SHL(GenRegister::ud1grf(126,0), GenRegister::ud1grf(126,0), GenRegister::immud(2));
+      p->ADD(GenRegister::ud1grf(126,0), GenRegister::ud1grf(126,0), GenRegister::ud1grf(126, 4));
+      p->SHL(GenRegister::ud1grf(126,0), GenRegister::ud1grf(126,0), GenRegister::immud(perThreadShift));
+      p->curr.execWidth = this->simdWidth;
+      p->ADD(stackptr, stackptr, bufferptr);
+      p->ADD(stackptr, stackptr, GenRegister::ud1grf(126,0));
+    p->pop();
+  }
+
+  void Gen8Context::newSelection(void) {
+    this->sel = GBE_NEW(Selection75, *this);
+  }
+}
+
diff --git a/backend/src/backend/gen8_context.hpp b/backend/src/backend/gen8_context.hpp
new file mode 100644
index 0000000..3269eeb
--- /dev/null
+++ b/backend/src/backend/gen8_context.hpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * \file gen8_context.hpp
+ */
+#ifndef __GBE_GEN8_CONTEXT_HPP__
+#define __GBE_GEN8_CONTEXT_HPP__
+
+#include "backend/gen_context.hpp"
+#include "backend/gen8_encoder.hpp"
+
+namespace gbe
+{
+  /* This class is used to implement the HSW
+     specific logic for context. */
+  class Gen8Context : public GenContext
+  {
+  public:
+    virtual ~Gen8Context(void) { }
+    Gen8Context(const ir::Unit &unit, const std::string &name, uint32_t deviceID, bool relaxMath = false)
+            : GenContext(unit, name, deviceID, relaxMath) {
+    };
+    /*! device's max srcatch buffer size */
+    #define GEN8_SCRATCH_SIZE  (2 * KB * KB)
+    /*! Emit the per-lane stack pointer computation */
+    virtual void emitStackPointer(void);
+    /*! Align the scratch size to the device's scratch unit size */
+    virtual uint32_t alignScratchSize(uint32_t size);
+    /*! Get the device's max srcatch size */
+    virtual uint32_t getScratchSize(void) {
+      //Because the allocate is use uint16_t, so clamp it, need refine
+      return std::min(GEN8_SCRATCH_SIZE, 0x7fff);
+    }
+
+  protected:
+    virtual GenEncoder* generateEncoder(void) {
+      return GBE_NEW(Gen8Encoder, this->simdWidth, 8, deviceID);
+    }
+
+  private:
+    virtual void emitSLMOffset(void);
+    virtual void allocSLMOffsetCurbe(void);
+    virtual void newSelection(void);
+  };
+}
+#endif /* __GBE_GEN8_CONTEXT_HPP__ */
+
diff --git a/backend/src/backend/gen_program.cpp b/backend/src/backend/gen_program.cpp
index 44f7e33..71a69dd 100644
--- a/backend/src/backend/gen_program.cpp
+++ b/backend/src/backend/gen_program.cpp
@@ -51,6 +51,7 @@
 #include "backend/gen_program.hpp"
 #include "backend/gen_context.hpp"
 #include "backend/gen75_context.hpp"
+#include "backend/gen8_context.hpp"
 #include "backend/gen_defs.hpp"
 #include "backend/gen/gen_mesa_disasm.h"
 #include "backend/gen_reg_allocation.hpp"
@@ -164,6 +165,8 @@ namespace gbe {
       ctx = GBE_NEW(GenContext, unit, name, deviceID, relaxMath);
     } else if (IS_HASWELL(deviceID)) {
       ctx = GBE_NEW(Gen75Context, unit, name, deviceID, relaxMath);
+    } else if (IS_BROADWELL(deviceID)) {
+      ctx = GBE_NEW(Gen8Context, unit, name, deviceID, relaxMath);
     }
     GBE_ASSERTM(ctx != NULL, "Fail to create the gen context\n");
 
-- 
1.8.3.2