// These methods do the actual work of specializing code
void visitInstruction(Instruction &I); // common work for every instr.
void visitGetElementPtrInst(GetElementPtrInst &I);
- void visitCastInst(CastInst &I);
void visitCallInst(CallInst &I);
// Helper functions for visiting operands of every instruction
}
-// Cast instructions:
-// -- make multi-step casts explicit:
-// -- float/double to uint32_t:
-// If target does not have a float-to-unsigned instruction, we
-// need to convert to uint64_t and then to uint32_t, or we may
-// overflow the signed int representation for legal uint32_t
-// values. Expand this without checking target.
-// -- other common transformations on operands
-//
-void
-PreSelection::visitCastInst(CastInst &I)
-{
- CastInst* castI = NULL;
-
- // Check for a global and put its address into a register before this instr
- if (I.getType() == Type::UIntTy &&
- I.getOperand(0)->getType()->isFloatingPoint()) {
- // insert a cast-fp-to-long before I, and then replace the operand of I
- castI = new CastInst(I.getOperand(0), Type::LongTy, "fp2Long2Uint", &I);
- I.setOperand(0, castI); // replace fp operand with long
- }
-
- // Perform other transformations common to all instructions
- visitInstruction(I);
- if (castI)
- visitInstruction(*castI);
-}
-
void
PreSelection::visitCallInst(CallInst &I)
{