src/gallium/drivers/llvmpipe/lp_bld_flow.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  27
  28 /**
  29  * LLVM control flow build helpers.
  30  *
  31  * @author Jose Fonseca <jfonseca@vmware.com>
  32  */
  33
  34 #ifndef LP_BLD_FLOW_H
  35 #define LP_BLD_FLOW_H
  36
  37
  38 #include <llvm-c/Core.h>
  39
  40
  41 union lp_type;
  42
  43
  44 struct lp_build_mask_context
  45 {
  46    LLVMBuilderRef builder;
  47
  48    LLVMTypeRef reg_type;
  49
  50    LLVMValueRef value;
  51
  52    LLVMValueRef phi;
  53
  54    LLVMBasicBlockRef skip_block;
  55 };
  56
  57
  58 void
  59 lp_build_mask_begin(struct lp_build_mask_context *mask,
  60                     LLVMBuilderRef builder,
  61                     union lp_type type,
  62                     LLVMValueRef value);
  63
  64 /**
  65  * Bitwise AND the mask with the given value, if a previous mask was set.
  66  */
  67 void
  68 lp_build_mask_update(struct lp_build_mask_context *mask,
  69                      LLVMValueRef value);
  70
  71 LLVMValueRef
  72 lp_build_mask_end(struct lp_build_mask_context *mask);
  73
  74
  75 /**
  76  * LLVM's IR doesn't represent for-loops directly. Furthermore it
  77  * it requires creating code blocks, branches, phi variables, so it
  78  * requires a fair amount of code.
  79  *
  80  * @sa http://www.llvm.org/docs/tutorial/LangImpl5.html#for
  81  */
  82 struct lp_build_loop_state
  83 {
  84   LLVMBasicBlockRef block;
  85   LLVMValueRef counter;
  86 };
  87
  88
  89 void
  90 lp_build_loop_begin(LLVMBuilderRef builder,
  91                     LLVMValueRef start,
  92                     struct lp_build_loop_state *state);
  93
  94
  95 void
  96 lp_build_loop_end(LLVMBuilderRef builder,
  97                   LLVMValueRef end,
  98                   LLVMValueRef step,
  99                   struct lp_build_loop_state *state);
 100
 101
 102
 103 #endif /* !LP_BLD_FLOW_H */