-/// callIsSmall - If a call is likely to lower to a single target instruction,
-/// or is otherwise deemed small return true.
-/// TODO: Perhaps calls like memcpy, strcpy, etc?
-bool llvm::callIsSmall(const Function *F) {
- if (!F) return false;
-
- if (F->hasLocalLinkage()) return false;
-
- if (!F->hasName()) return false;
-
- StringRef Name = F->getName();
-
- // These will all likely lower to a single selection DAG node.
- if (Name == "copysign" || Name == "copysignf" || Name == "copysignl" ||
- Name == "fabs" || Name == "fabsf" || Name == "fabsl" ||
- Name == "sin" || Name == "sinf" || Name == "sinl" ||
- Name == "cos" || Name == "cosf" || Name == "cosl" ||
- Name == "sqrt" || Name == "sqrtf" || Name == "sqrtl" )
- return true;
-
- // These are all likely to be optimized into something smaller.
- if (Name == "pow" || Name == "powf" || Name == "powl" ||
- Name == "exp2" || Name == "exp2l" || Name == "exp2f" ||
- Name == "floor" || Name == "floorf" || Name == "ceil" ||
- Name == "round" || Name == "ffs" || Name == "ffsl" ||
- Name == "abs" || Name == "labs" || Name == "llabs")
- return true;
-
- return false;
-}
-
-bool llvm::isInstructionFree(const Instruction *I, const TargetData *TD) {
- if (isa<PHINode>(I))
- return true;
-
- // If a GEP has all constant indices, it will probably be folded with
- // a load/store.
- if (const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(I))
- return GEP->hasAllConstantIndices();
-
- if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
- switch (II->getIntrinsicID()) {
- default:
- return false;
- case Intrinsic::dbg_declare:
- case Intrinsic::dbg_value:
- case Intrinsic::invariant_start:
- case Intrinsic::invariant_end:
- case Intrinsic::lifetime_start:
- case Intrinsic::lifetime_end:
- case Intrinsic::objectsize:
- case Intrinsic::ptr_annotation:
- case Intrinsic::var_annotation:
- // These intrinsics don't count as size.
- return true;
- }
- }
-
- if (const CastInst *CI = dyn_cast<CastInst>(I)) {
- // Noop casts, including ptr <-> int, don't count.
- if (CI->isLosslessCast() || isa<IntToPtrInst>(CI) || isa<PtrToIntInst>(CI))
- return true;
- // trunc to a native type is free (assuming the target has compare and
- // shift-right of the same width).
- if (TD && isa<TruncInst>(CI) &&
- TD->isLegalInteger(TD->getTypeSizeInBits(CI->getType())))
- return true;
- // Result of a cmp instruction is often extended (to be used by other
- // cmp instructions, logical or return instructions). These are usually
- // nop on most sane targets.
- if (isa<CmpInst>(CI->getOperand(0)))
- return true;
- }
-
- return false;
-}
-