llvmpipe: Pixel packing/unpacking and loop code generators.

Just a small proof of concept plus a standalone test app. Not integrated
with the rest of the driver yet.

1 files changed, 199 insertions, 0 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_bld_test.c b/src/gallium/drivers/llvmpipe/lp_bld_test.c
new file mode 100644
index 0000000000..5325b7d333
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_test.c
@@ -0,0 +1,199 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Vmware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <llvm-c/Core.h>
+#include <llvm-c/Analysis.h>
+#include <llvm-c/ExecutionEngine.h>
+#include <llvm-c/Target.h>
+#include <llvm-c/Transforms/Scalar.h>
+
+#include "lp_bld.h"
+
+
+static LLVMValueRef
+add_unpack_rgba_test(LLVMModuleRef module,
+                     enum pipe_format format)
+{
+   LLVMTypeRef args[] = {
+      LLVMPointerType(LLVMInt8Type(), 0),
+      LLVMPointerType(LLVMVectorType(LLVMFloatType(), 4), 0)
+   };
+   LLVMValueRef func = LLVMAddFunction(module, "unpack", LLVMFunctionType(LLVMVoidType(), args, 2, 0));
+   LLVMSetFunctionCallConv(func, LLVMCCallConv);
+   LLVMValueRef ptr = LLVMGetParam(func, 0);
+   LLVMValueRef rgba_ptr = LLVMGetParam(func, 1);
+
+   LLVMBasicBlockRef block = LLVMAppendBasicBlock(func, "entry");
+   LLVMBuilderRef builder = LLVMCreateBuilder();
+   LLVMPositionBuilderAtEnd(builder, block);
+
+   LLVMValueRef rgba;
+
+   struct lp_build_loop_state loop;
+
+   lp_build_loop_begin(builder, LLVMConstInt(LLVMInt32Type(), 1, 0), &loop);
+
+   rgba = lp_build_unpack_rgba(builder, format, ptr);
+   LLVMBuildStore(builder, rgba, rgba_ptr);
+
+   lp_build_loop_end(builder, LLVMConstInt(LLVMInt32Type(), 4, 0), NULL, &loop);
+
+   LLVMBuildRetVoid(builder);
+
+   LLVMDisposeBuilder(builder);
+   return func;
+}
+
+
+static LLVMValueRef
+add_pack_rgba_test(LLVMModuleRef module,
+                   enum pipe_format format)
+{
+   LLVMTypeRef args[] = {
+      LLVMPointerType(LLVMInt8Type(), 0),
+      LLVMPointerType(LLVMVectorType(LLVMFloatType(), 4), 0)
+   };
+   LLVMValueRef func = LLVMAddFunction(module, "pack", LLVMFunctionType(LLVMVoidType(), args, 2, 0));
+   LLVMSetFunctionCallConv(func, LLVMCCallConv);
+   LLVMValueRef ptr = LLVMGetParam(func, 0);
+   LLVMValueRef rgba_ptr = LLVMGetParam(func, 1);
+
+   LLVMBasicBlockRef block = LLVMAppendBasicBlock(func, "entry");
+   LLVMBuilderRef builder = LLVMCreateBuilder();
+   LLVMPositionBuilderAtEnd(builder, block);
+
+   LLVMValueRef rgba;
+
+   rgba = LLVMBuildLoad(builder, rgba_ptr, "");
+
+   lp_build_pack_rgba(builder, format, ptr, rgba);
+
+   LLVMBuildRetVoid(builder);
+
+   LLVMDisposeBuilder(builder);
+   return func;
+}
+
+
+int main(int argc, char **argv)
+{
+   char *error = NULL;
+   int n;
+
+   if (argc > 1)
+      sscanf(argv[1], "%x", &n);
+   else
+      n = 0x0000f0f0;
+
+   LLVMModuleRef module = LLVMModuleCreateWithName("test");
+
+   enum pipe_format format;
+   format = PIPE_FORMAT_R5G6B5_UNORM;
+   LLVMValueRef unpack = add_unpack_rgba_test(module, format);
+   LLVMValueRef pack = add_pack_rgba_test(module, format);
+
+   LLVMVerifyModule(module, LLVMAbortProcessAction, &error);
+   LLVMDisposeMessage(error);
+
+   LLVMExecutionEngineRef engine;
+   LLVMModuleProviderRef provider = LLVMCreateModuleProviderForExistingModule(module);
+   error = NULL;
+   LLVMCreateJITCompiler(&engine, provider, 1, &error);
+   if (error) {
+      fprintf(stderr, "%s\n", error);
+      LLVMDisposeMessage(error);
+      abort();
+   }
+
+   LLVMPassManagerRef pass = LLVMCreatePassManager();
+#if 0
+   LLVMAddTargetData(LLVMGetExecutionEngineTargetData(engine), pass);
+   /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
+    * but there are more on SVN. */
+   LLVMAddConstantPropagationPass(pass);
+   LLVMAddInstructionCombiningPass(pass);
+   LLVMAddPromoteMemoryToRegisterPass(pass);
+   LLVMAddDemoteMemoryToRegisterPass(pass);
+   LLVMAddGVNPass(pass);
+   LLVMAddCFGSimplificationPass(pass);
+   LLVMRunPassManager(pass, module);
+#endif
+   LLVMDumpModule(module);
+
+   printf("Packed: %08x\n", n);
+
+   float rgba[4] = {0, 0, 0, 0};
+
+   {
+#if 1
+      typedef void (*unpack_ptr_t)(void *, float *);
+      unpack_ptr_t unpack_ptr = (unpack_ptr_t)LLVMGetPointerToGlobal(engine, unpack);
+
+      unpack_ptr(&n, rgba);
+#else
+      LLVMGenericValueRef exec_args[] = {
+         LLVMCreateGenericValueOfPointer(n),
+         LLVMCreateGenericValueOfPointer(rgba)
+      };
+      LLVMGenericValueRef exec_res = LLVMRunFunction(engine, unpack, 2, exec_args);
+#endif
+
+      printf("Unpacked: %f %f %f %f\n",
+             rgba[0],
+             rgba[1],
+             rgba[2],
+             rgba[3]);
+   }
+
+   n = 0;
+
+   {
+#if 1
+      typedef void (*pack_ptr_t)(void *, float *);
+      pack_ptr_t pack_ptr = (pack_ptr_t)LLVMGetPointerToGlobal(engine, pack);
+
+      pack_ptr(&n, rgba);
+#else
+      LLVMGenericValueRef exec_args[] = {
+         LLVMCreateGenericValueOfPointer(n),
+         LLVMCreateGenericValueOfPointer(rgba)
+      };
+      LLVMGenericValueRef exec_res = LLVMRunFunction(engine, pack, 2, exec_args);
+#endif
+
+      printf("Packed: %08x\n", n);
+   }
+
+   LLVMDisposePassManager(pass);
+   LLVMDisposeExecutionEngine(engine);
+
+   return 0;
+}