diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_flow.c')
-rw-r--r-- | src/gallium/drivers/llvmpipe/lp_bld_flow.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_flow.c b/src/gallium/drivers/llvmpipe/lp_bld_flow.c new file mode 100644 index 0000000000..9d99e1a9d9 --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_bld_flow.c @@ -0,0 +1,173 @@ +/************************************************************************** + * + * 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. + * + **************************************************************************/ + +/** + * LLVM control flow build helpers. + * + * @author Jose Fonseca <jfonseca@vmware.com> + */ + +#include "util/u_debug.h" + +#include "lp_bld_type.h" +#include "lp_bld_flow.h" + + +void +lp_build_mask_begin(struct lp_build_mask_context *mask, + LLVMBuilderRef builder, + union lp_type type, + LLVMValueRef value) +{ + memset(mask, 0, sizeof *mask); + + mask->builder = builder; + mask->reg_type = LLVMIntType(type.width * type.length); + mask->value = value; +} + + +void +lp_build_mask_update(struct lp_build_mask_context *mask, + LLVMValueRef value) +{ + + LLVMValueRef cond; + LLVMBasicBlockRef current_block; + LLVMBasicBlockRef next_block; + LLVMBasicBlockRef new_block; + + if(mask->value) + mask->value = LLVMBuildAnd(mask->builder, mask->value, value, ""); + else + mask->value = value; + + /* FIXME: disabled until we have proper control flow helpers */ +#if 0 + cond = LLVMBuildICmp(mask->builder, + LLVMIntEQ, + LLVMBuildBitCast(mask->builder, mask->value, mask->reg_type, ""), + LLVMConstNull(mask->reg_type), + ""); + + current_block = LLVMGetInsertBlock(mask->builder); + + if(!mask->skip_block) { + LLVMValueRef function = LLVMGetBasicBlockParent(current_block); + mask->skip_block = LLVMAppendBasicBlock(function, "skip"); + + mask->phi = LLVMBuildPhi(mask->builder, LLVMTypeOf(mask->value), ""); + } + + next_block = LLVMGetNextBasicBlock(current_block); + assert(next_block); + if(next_block) { + new_block = LLVMInsertBasicBlock(next_block, ""); + } + else { + LLVMValueRef function = LLVMGetBasicBlockParent(current_block); + new_block = LLVMAppendBasicBlock(function, ""); + } + + LLVMAddIncoming(mask->phi, &mask->value, ¤t_block, 1); + LLVMBuildCondBr(mask->builder, cond, mask->skip_block, new_block); + + LLVMPositionBuilderAtEnd(mask->builder, new_block); +#endif +} + + +LLVMValueRef +lp_build_mask_end(struct lp_build_mask_context *mask) +{ + if(mask->skip_block) { + LLVMBasicBlockRef current_block = LLVMGetInsertBlock(mask->builder); + + LLVMAddIncoming(mask->phi, &mask->value, ¤t_block, 1); + LLVMBuildBr(mask->builder, mask->skip_block); + + LLVMPositionBuilderAtEnd(mask->builder, mask->skip_block); + + mask->value = mask->phi; + mask->phi = NULL; + mask->skip_block = NULL; + } + + return mask->value; +} + + + +void +lp_build_loop_begin(LLVMBuilderRef builder, + LLVMValueRef start, + struct lp_build_loop_state *state) +{ + LLVMBasicBlockRef block = LLVMGetInsertBlock(builder); + LLVMValueRef function = LLVMGetBasicBlockParent(block); + + state->block = LLVMAppendBasicBlock(function, "loop"); + + LLVMBuildBr(builder, state->block); + + LLVMPositionBuilderAtEnd(builder, state->block); + + state->counter = LLVMBuildPhi(builder, LLVMTypeOf(start), ""); + + LLVMAddIncoming(state->counter, &start, &block, 1); + +} + + +void +lp_build_loop_end(LLVMBuilderRef builder, + LLVMValueRef end, + LLVMValueRef step, + struct lp_build_loop_state *state) +{ + LLVMBasicBlockRef block = LLVMGetInsertBlock(builder); + LLVMValueRef function = LLVMGetBasicBlockParent(block); + LLVMValueRef next; + LLVMValueRef cond; + LLVMBasicBlockRef after_block; + + if (!step) + step = LLVMConstInt(LLVMTypeOf(end), 1, 0); + + next = LLVMBuildAdd(builder, state->counter, step, ""); + + cond = LLVMBuildICmp(builder, LLVMIntNE, next, end, ""); + + after_block = LLVMAppendBasicBlock(function, ""); + + LLVMBuildCondBr(builder, cond, after_block, state->block); + + LLVMAddIncoming(state->counter, &next, &block, 1); + + LLVMPositionBuilderAtEnd(builder, after_block); +} + |