gallium/draw: initial code to properly support llvm in the draw module

code generate big chunks of the vertex pipeline in order to speed up
software vertex processing.

1 files changed, 311 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
new file mode 100644
index 00000000000..6b0ddfd064d
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -0,0 +1,311 @@
+#include "draw_llvm.h"
+
+#include "draw_context.h"
+#include "draw_vs.h"
+
+#include "gallivm/lp_bld_arit.h"
+#include "gallivm/lp_bld_interp.h"
+#include "gallivm/lp_bld_struct.h"
+#include "gallivm/lp_bld_type.h"
+#include "gallivm/lp_bld_flow.h"
+#include "gallivm/lp_bld_debug.h"
+#include "gallivm/lp_bld_tgsi.h"
+
+#include "util/u_cpu_detect.h"
+
+#include <llvm-c/Transforms/Scalar.h>
+
+static void
+init_globals(struct draw_llvm *llvm)
+{
+    LLVMTypeRef vertex_header;
+    LLVMTypeRef texture_type;
+
+   /* struct vertex_header */
+   {
+      LLVMTypeRef elem_types[3];
+
+      elem_types[0]  = LLVMIntType(32);
+      elem_types[1]  = LLVMArrayType(LLVMFloatType(), 4);
+      elem_types[2]  = LLVMArrayType(elem_types[1], 0);
+
+      vertex_header = LLVMStructType(elem_types, Elements(elem_types), 0);
+
+      /* these are bit-fields and we can't take address of them
+      LP_CHECK_MEMBER_OFFSET(struct vertex_header, clipmask,
+                             llvm->target, vertex_header,
+                             DRAW_JIT_VERTEX_CLIPMASK);
+      LP_CHECK_MEMBER_OFFSET(struct vertex_header, edgeflag,
+                             llvm->target, vertex_header,
+                             DRAW_JIT_VERTEX_EDGEFLAG);
+      LP_CHECK_MEMBER_OFFSET(struct vertex_header, pad,
+                             llvm->target, vertex_header,
+                             DRAW_JIT_VERTEX_PAD);
+      LP_CHECK_MEMBER_OFFSET(struct vertex_header, vertex_id,
+                             llvm->target, vertex_header,
+                             DRAW_JIT_VERTEX_VERTEX_ID);
+      */
+      LP_CHECK_MEMBER_OFFSET(struct vertex_header, clip,
+                             llvm->target, vertex_header,
+                             DRAW_JIT_VERTEX_CLIP);
+      LP_CHECK_MEMBER_OFFSET(struct vertex_header, data,
+                             llvm->target, vertex_header,
+                             DRAW_JIT_VERTEX_DATA);
+
+      LP_CHECK_STRUCT_SIZE(struct vertex_header,
+                           llvm->target, vertex_header);
+
+      LLVMAddTypeName(llvm->module, "vertex_header", vertex_header);
+
+      llvm->vertex_header_ptr_type = LLVMPointerType(vertex_header, 0);
+   }
+      /* struct draw_jit_texture */
+   {
+      LLVMTypeRef elem_types[4];
+
+      elem_types[DRAW_JIT_TEXTURE_WIDTH]  = LLVMInt32Type();
+      elem_types[DRAW_JIT_TEXTURE_HEIGHT] = LLVMInt32Type();
+      elem_types[DRAW_JIT_TEXTURE_STRIDE] = LLVMInt32Type();
+      elem_types[DRAW_JIT_TEXTURE_DATA]   = LLVMPointerType(LLVMInt8Type(), 0);
+
+      texture_type = LLVMStructType(elem_types, Elements(elem_types), 0);
+
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_texture, width,
+                             llvm->target, texture_type,
+                             DRAW_JIT_TEXTURE_WIDTH);
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_texture, height,
+                             llvm->target, texture_type,
+                             DRAW_JIT_TEXTURE_HEIGHT);
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_texture, stride,
+                             llvm->target, texture_type,
+                             DRAW_JIT_TEXTURE_STRIDE);
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_texture, data,
+                             llvm->target, texture_type,
+                             DRAW_JIT_TEXTURE_DATA);
+      LP_CHECK_STRUCT_SIZE(struct draw_jit_texture,
+                           llvm->target, texture_type);
+
+      LLVMAddTypeName(llvm->module, "texture", texture_type);
+   }
+
+
+   /* struct draw_jit_context */
+   {
+      LLVMTypeRef elem_types[3];
+      LLVMTypeRef context_type;
+
+      elem_types[0] = LLVMPointerType(LLVMFloatType(), 0); /* vs_constants */
+      elem_types[1] = LLVMPointerType(LLVMFloatType(), 0); /* vs_constants */
+      elem_types[2] = LLVMArrayType(texture_type, PIPE_MAX_SAMPLERS); /* textures */
+
+      context_type = LLVMStructType(elem_types, Elements(elem_types), 0);
+
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_context, vs_constants,
+                             llvm->target, context_type, 0);
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_context, gs_constants,
+                             llvm->target, context_type, 1);
+      LP_CHECK_MEMBER_OFFSET(struct draw_jit_context, textures,
+                             llvm->target, context_type,
+                             DRAW_JIT_CONTEXT_TEXTURES_INDEX);
+      LP_CHECK_STRUCT_SIZE(struct draw_jit_context,
+                           llvm->target, context_type);
+
+      LLVMAddTypeName(llvm->module, "context", context_type);
+
+      llvm->context_ptr_type = LLVMPointerType(context_type, 0);
+   }
+}
+
+struct draw_llvm *
+draw_llvm_create(struct draw_context *draw)
+{
+   struct draw_llvm *llvm = CALLOC_STRUCT( draw_llvm );
+
+   util_cpu_detect();
+
+   llvm->draw = draw;
+   llvm->engine = draw->engine;
+
+   debug_assert(llvm->engine);
+
+   llvm->module = LLVMModuleCreateWithName("draw_llvm");
+   llvm->provider = LLVMCreateModuleProviderForExistingModule(llvm->module);
+
+   LLVMAddModuleProvider(llvm->engine, llvm->provider);
+
+   llvm->target = LLVMGetExecutionEngineTargetData(llvm->engine);
+
+   llvm->pass = LLVMCreateFunctionPassManager(llvm->provider);
+   LLVMAddTargetData(llvm->target, llvm->pass);
+   /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
+    * but there are more on SVN. */
+   /* TODO: Add more passes */
+   LLVMAddConstantPropagationPass(llvm->pass);
+   if(util_cpu_caps.has_sse4_1) {
+      /* FIXME: There is a bug in this pass, whereby the combination of fptosi
+       * and sitofp (necessary for trunc/floor/ceil/round implementation)
+       * somehow becomes invalid code.
+       */
+      LLVMAddInstructionCombiningPass(llvm->pass);
+   }
+   LLVMAddPromoteMemoryToRegisterPass(llvm->pass);
+   LLVMAddGVNPass(llvm->pass);
+   LLVMAddCFGSimplificationPass(llvm->pass);
+
+   init_globals(llvm);
+
+
+#if 1
+   LLVMDumpModule(llvm->module);
+#endif
+
+   return llvm;
+}
+
+void
+draw_llvm_destroy(struct draw_llvm *llvm)
+{
+   free(llvm);
+}
+
+void
+draw_llvm_prepare(struct draw_llvm *llvm)
+{
+}
+
+
+struct draw_context *draw_create_with_llvm(LLVMExecutionEngineRef engine)
+{
+   struct draw_context *draw = CALLOC_STRUCT( draw_context );
+   if (draw == NULL)
+      goto fail;
+   draw->engine = engine;
+
+   if (!draw_init(draw))
+      goto fail;
+
+   return draw;
+
+fail:
+   draw_destroy( draw );
+   return NULL;
+}
+
+static void
+generate_vs(struct draw_llvm *llvm,
+            LLVMBuilderRef builder,
+            LLVMValueRef context_ptr,
+            LLVMValueRef io)
+{
+   const struct tgsi_token *tokens = llvm->draw->vs.vertex_shader->state.tokens;
+   struct lp_type vs_type = lp_type_float(32);
+   LLVMValueRef vs_consts;
+   const LLVMValueRef (*inputs)[NUM_CHANNELS];
+   LLVMValueRef (*outputs)[NUM_CHANNELS];
+
+   lp_build_tgsi_soa(builder,
+                     tokens,
+                     vs_type,
+                     NULL /*struct lp_build_mask_context *mask*/,
+                     vs_consts,
+                     NULL /*pos*/,
+                     inputs,
+                     outputs,
+                     NULL/*sampler*/);
+}
+
+void
+draw_llvm_generate(struct draw_llvm *llvm)
+{
+   LLVMTypeRef arg_types[5];
+   LLVMTypeRef func_type;
+   LLVMValueRef context_ptr;
+   LLVMBasicBlockRef block;
+   LLVMBuilderRef builder;
+   LLVMValueRef function;
+   LLVMValueRef start, end, count, stride, step;
+   LLVMValueRef io_ptr;
+   unsigned i;
+   unsigned chan;
+   struct lp_build_context bld;
+   struct lp_build_loop_state lp_loop;
+   struct lp_type vs_type = lp_type_float(32);
+
+   arg_types[0] = llvm->context_ptr_type;           /* context */
+   arg_types[1] = llvm->vertex_header_ptr_type;     /* vertex_header */
+   arg_types[2] = LLVMInt32Type();                  /* start */
+   arg_types[3] = LLVMInt32Type();                  /* count */
+   arg_types[4] = LLVMInt32Type();                  /* stride */
+
+   func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
+
+   function = LLVMAddFunction(llvm->module, "draw_llvm_shader", func_type);
+   LLVMSetFunctionCallConv(function, LLVMCCallConv);
+   for(i = 0; i < Elements(arg_types); ++i)
+      if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
+         LLVMAddAttribute(LLVMGetParam(function, i), LLVMNoAliasAttribute);
+
+   context_ptr  = LLVMGetParam(function, 0);
+   io_ptr       = LLVMGetParam(function, 1);
+   start        = LLVMGetParam(function, 2);
+   count        = LLVMGetParam(function, 3);
+   stride       = LLVMGetParam(function, 4);
+
+   lp_build_name(context_ptr, "context");
+   lp_build_name(io_ptr, "io");
+   lp_build_name(start, "start");
+   lp_build_name(count, "count");
+   lp_build_name(stride, "stride");
+
+   /*
+    * Function body
+    */
+
+   block = LLVMAppendBasicBlock(function, "entry");
+   builder = LLVMCreateBuilder();
+   LLVMPositionBuilderAtEnd(builder, block);
+
+   lp_build_context_init(&bld, builder, vs_type);
+
+   end = lp_build_add(&bld, start, count);
+
+   step = LLVMConstInt(LLVMInt32Type(), 1, 0);
+   lp_build_loop_begin(builder, start, &lp_loop);
+   {
+      LLVMValueRef io = LLVMBuildGEP(builder, io_ptr, &lp_loop.counter, 1, "");
+
+      generate_vs(llvm,
+                  builder,
+                  context_ptr,
+                  io);
+   }
+   lp_build_loop_end(builder, end, step, &lp_loop);
+
+
+   LLVMBuildRetVoid(builder);
+
+   LLVMDisposeBuilder(builder);
+
+   /*
+    * Translate the LLVM IR into machine code.
+    */
+
+#ifdef DEBUG
+   if(LLVMVerifyFunction(function, LLVMPrintMessageAction)) {
+      LLVMDumpValue(function);
+      assert(0);
+   }
+#endif
+
+   LLVMRunFunctionPassManager(llvm->pass, function);
+
+   if (1) {
+      LLVMDumpValue(function);
+      debug_printf("\n");
+   }
+
+   llvm->jit_func = (draw_jit_vert_func)LLVMGetPointerToGlobal(llvm->draw->engine, function);
+
+   if (1)
+      lp_disassemble(llvm->jit_func);
+}