diff options
| -rw-r--r-- | backend/src/backend/gen_insn_selection.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/backend/src/backend/gen_insn_selection.cpp b/backend/src/backend/gen_insn_selection.cpp index 7498f382..c89a83e7 100644 --- a/backend/src/backend/gen_insn_selection.cpp +++ b/backend/src/backend/gen_insn_selection.cpp @@ -3279,6 +3279,34 @@ extern bool OCL_DEBUGINFO; // first defined by calling BVAR in program.cpp sel.MATH(dst, function, src0, src1); } else if(type == TYPE_FLOAT) { GBE_ASSERT(op != OP_REM); + SelectionDAG *child0 = dag.child[0]; + if (child0 && child0->insn.getOpcode() == OP_LOADI) { + const auto &loadimm = cast<LoadImmInstruction>(child0->insn); + const Immediate imm = loadimm.getImmediate(); + float immVal = imm.getFloatValue(); + int* dwPtr = (int*)&immVal; + + //if immedia is a exactly pow of 2, it can be converted to RCP + if((*dwPtr & 0x7FFFFF) == 0) { + if(immVal == -1.0f) + { + GenRegister tmp = GenRegister::negate(src1); + sel.MATH(dst, GEN_MATH_FUNCTION_INV, tmp); + } + else { + sel.MATH(dst, GEN_MATH_FUNCTION_INV, src1); + if(immVal != 1.0f) { + GenRegister isrc = GenRegister::immf(immVal); + sel.MUL(dst, dst, isrc); + } + } + + if(dag.child[1]) + dag.child[1]->isRoot = 1; + return true; + } + } + sel.MATH(dst, GEN_MATH_FUNCTION_FDIV, src0, src1); } else if (type == TYPE_S64 || type == TYPE_U64) { GenRegister tmp[15]; |