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/**************************************************************************
*
* 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;
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);
}
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);
}
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