diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_intr.c')
-rw-r--r-- | src/gallium/drivers/llvmpipe/lp_bld_intr.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_intr.c b/src/gallium/drivers/llvmpipe/lp_bld_intr.c new file mode 100644 index 0000000000..c055f8f38c --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_bld_intr.c @@ -0,0 +1,87 @@ +/************************************************************************** + * + * 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. + * + **************************************************************************/ + + +/** + * @file + * Helper + * + * LLVM IR doesn't support all basic arithmetic operations we care about (most + * notably min/max and saturated operations), and it is often necessary to + * resort machine-specific intrinsics directly. The functions here hide all + * these implementation details from the other modules. + * + * We also do simple expressions simplification here. Reasons are: + * - it is very easy given we have all necessary information readily available + * - LLVM optimization passes fail to simplify several vector expressions + * - We often know value constraints which the optimization passes have no way + * of knowing, such as when source arguments are known to be in [0, 1] range. + * + * @author Jose Fonseca <jfonseca@vmware.com> + */ + + +#include "util/u_debug.h" + +#include "lp_bld_intr.h" + + +LLVMValueRef +lp_build_intrinsic_binary(LLVMBuilderRef builder, + const char *name, + LLVMTypeRef ret_type, + LLVMValueRef a, + LLVMValueRef b) +{ + LLVMModuleRef module = LLVMGetGlobalParent(LLVMGetBasicBlockParent(LLVMGetInsertBlock(builder))); + LLVMValueRef function; + LLVMValueRef args[2]; + + function = LLVMGetNamedFunction(module, name); + if(!function) { + LLVMTypeRef arg_types[2]; + arg_types[0] = LLVMTypeOf(a); + arg_types[1] = LLVMTypeOf(b); + function = LLVMAddFunction(module, name, LLVMFunctionType(ret_type, arg_types, 2, 0)); + LLVMSetFunctionCallConv(function, LLVMCCallConv); + LLVMSetLinkage(function, LLVMExternalLinkage); + } + assert(LLVMIsDeclaration(function)); + +#ifdef DEBUG + /* We shouldn't use only constants with intrinsics, as they won't be + * propagated by LLVM optimization passes. + */ + if(LLVMIsConstant(a) && LLVMIsConstant(b)) + debug_printf("warning: invoking intrinsic \"%s\" with constants\n"); +#endif + + args[0] = a; + args[1] = b; + + return LLVMBuildCall(builder, function, args, 2, ""); +} |