[Beignet] [PATCH 1/3] Add Gen IR 'IF' and 'ENDIF'

[Yongjia Zhang]

Add these two Gen IRs to mark structured basic blocks for future
structure analysis.

Signed-off-by: Yongjia Zhang <yongjia.zhang at intel.com>
---
 backend/src/ir/instruction.cpp | 16 +++++++++++++---
 backend/src/ir/instruction.hpp |  4 ++++
 backend/src/ir/instruction.hxx |  2 ++
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/backend/src/ir/instruction.cpp b/backend/src/ir/instruction.cpp
index 2d2b34b..de53f6d 100644
--- a/backend/src/ir/instruction.cpp
+++ b/backend/src/ir/instruction.cpp
@@ -345,7 +345,7 @@ namespace ir {
     {
     public:
       INLINE BranchInstruction(Opcode op, LabelIndex labelIndex, Register predicate) {
-        GBE_ASSERT(op == OP_BRA);
+        GBE_ASSERT(op == OP_BRA || op == OP_IF);
         this->opcode = op;
         this->predicate = predicate;
         this->labelIndex = labelIndex;
@@ -353,8 +353,8 @@ namespace ir {
         this->hasLabel = true;
       }
       INLINE BranchInstruction(Opcode op, LabelIndex labelIndex) {
-        GBE_ASSERT(op == OP_BRA);
-        this->opcode = OP_BRA;
+        GBE_ASSERT(op == OP_BRA || op == OP_ENDIF);
+        this->opcode = op;
         this->labelIndex = labelIndex;
         this->hasPredicate = false;
         this->hasLabel = true;
@@ -1600,6 +1600,16 @@ DECL_MEM_FN(GetImageInfoInstruction, const uint8_t, getImageIndex(void), getImag
     return internal::BranchInstruction(OP_BRA, labelIndex, pred).convert();
   }
 
+  // IF
+  Instruction IF(LabelIndex labelIndex, Register pred) {
+    return internal::BranchInstruction(OP_IF, labelIndex, pred).convert();
+  }
+
+  // ENDIF
+  Instruction ENDIF(LabelIndex labelIndex) {
+    return internal::BranchInstruction(OP_ENDIF, labelIndex).convert();
+  }
+
   // RET
   Instruction RET(void) {
     return internal::BranchInstruction(OP_RET).convert();
diff --git a/backend/src/ir/instruction.hpp b/backend/src/ir/instruction.hpp
index 582e22d..d5031d2 100644
--- a/backend/src/ir/instruction.hpp
+++ b/backend/src/ir/instruction.hpp
@@ -651,6 +651,10 @@ namespace ir {
   Instruction BRA(LabelIndex labelIndex);
   /*! (pred) bra labelIndex */
   Instruction BRA(LabelIndex labelIndex, Register pred);
+  /*! (pred) if labelIndex */
+  Instruction IF(LabelIndex labelIndex, Register pred);
+  /*! endif labelIndex(marks the label of this endif itself) */
+  Instruction ENDIF(LabelIndex labelIndex);
   /*! ret */
   Instruction RET(void);
   /*! load.type.space {dst1,...,dst_valueNum} offset value */
diff --git a/backend/src/ir/instruction.hxx b/backend/src/ir/instruction.hxx
index 587517b..8083085 100644
--- a/backend/src/ir/instruction.hxx
+++ b/backend/src/ir/instruction.hxx
@@ -93,3 +93,5 @@ DECL_INSN(UPSAMPLE_INT, BinaryInstruction)
 DECL_INSN(UPSAMPLE_LONG, BinaryInstruction)
 DECL_INSN(I64MADSAT, TernaryInstruction)
 DECL_INSN(MAD, TernaryInstruction)
+DECL_INSN(IF, BranchInstruction)
+DECL_INSN(ENDIF, BranchInstruction)
-- 
1.8.3.2