- } else {
- switch (II->getIntrinsicID()) {
- default: break;
- case Intrinsic::ppc_altivec_lvx:
- case Intrinsic::ppc_altivec_lvxl:
- case Intrinsic::x86_sse_loadu_ps:
- case Intrinsic::x86_sse2_loadu_pd:
- case Intrinsic::x86_sse2_loadu_dq:
- // Turn PPC lvx -> load if the pointer is known aligned.
- // Turn X86 loadups -> load if the pointer is known aligned.
- if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
- Value *Ptr = InsertBitCastBefore(II->getOperand(1),
- PointerType::getUnqual(II->getType()),
- CI);
- return new LoadInst(Ptr);
- }
- break;
- case Intrinsic::ppc_altivec_stvx:
- case Intrinsic::ppc_altivec_stvxl:
- // Turn stvx -> store if the pointer is known aligned.
- if (GetOrEnforceKnownAlignment(II->getOperand(2), 16) >= 16) {
- const Type *OpPtrTy =
- PointerType::getUnqual(II->getOperand(1)->getType());
- Value *Ptr = InsertBitCastBefore(II->getOperand(2), OpPtrTy, CI);
- return new StoreInst(II->getOperand(1), Ptr);
- }
- break;
- case Intrinsic::x86_sse_storeu_ps:
- case Intrinsic::x86_sse2_storeu_pd:
- case Intrinsic::x86_sse2_storeu_dq:
- case Intrinsic::x86_sse2_storel_dq:
- // Turn X86 storeu -> store if the pointer is known aligned.
- if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
- const Type *OpPtrTy =
- PointerType::getUnqual(II->getOperand(2)->getType());
- Value *Ptr = InsertBitCastBefore(II->getOperand(1), OpPtrTy, CI);
- return new StoreInst(II->getOperand(2), Ptr);
- }
- break;
+ }
+
+ switch (II->getIntrinsicID()) {
+ default: break;
+ case Intrinsic::bswap:
+ // bswap(bswap(x)) -> x
+ if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getOperand(1)))
+ if (Operand->getIntrinsicID() == Intrinsic::bswap)
+ return ReplaceInstUsesWith(CI, Operand->getOperand(1));
+ break;
+ case Intrinsic::ppc_altivec_lvx:
+ case Intrinsic::ppc_altivec_lvxl:
+ case Intrinsic::x86_sse_loadu_ps:
+ case Intrinsic::x86_sse2_loadu_pd:
+ case Intrinsic::x86_sse2_loadu_dq:
+ // Turn PPC lvx -> load if the pointer is known aligned.
+ // Turn X86 loadups -> load if the pointer is known aligned.
+ if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
+ Value *Ptr = InsertBitCastBefore(II->getOperand(1),
+ PointerType::getUnqual(II->getType()),
+ CI);
+ return new LoadInst(Ptr);
+ }
+ break;
+ case Intrinsic::ppc_altivec_stvx:
+ case Intrinsic::ppc_altivec_stvxl:
+ // Turn stvx -> store if the pointer is known aligned.
+ if (GetOrEnforceKnownAlignment(II->getOperand(2), 16) >= 16) {
+ const Type *OpPtrTy =
+ PointerType::getUnqual(II->getOperand(1)->getType());
+ Value *Ptr = InsertBitCastBefore(II->getOperand(2), OpPtrTy, CI);
+ return new StoreInst(II->getOperand(1), Ptr);
+ }
+ break;
+ case Intrinsic::x86_sse_storeu_ps:
+ case Intrinsic::x86_sse2_storeu_pd:
+ case Intrinsic::x86_sse2_storeu_dq:
+ case Intrinsic::x86_sse2_storel_dq:
+ // Turn X86 storeu -> store if the pointer is known aligned.
+ if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) {
+ const Type *OpPtrTy =
+ PointerType::getUnqual(II->getOperand(2)->getType());
+ Value *Ptr = InsertBitCastBefore(II->getOperand(1), OpPtrTy, CI);
+ return new StoreInst(II->getOperand(2), Ptr);
+ }
+ break;
+
+ case Intrinsic::x86_sse_cvttss2si: {
+ // These intrinsics only demands the 0th element of its input vector. If
+ // we can simplify the input based on that, do so now.
+ uint64_t UndefElts;
+ if (Value *V = SimplifyDemandedVectorElts(II->getOperand(1), 1,
+ UndefElts)) {
+ II->setOperand(1, V);
+ return II;
+ }
+ break;
+ }
+
+ case Intrinsic::ppc_altivec_vperm:
+ // Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant.
+ if (ConstantVector *Mask = dyn_cast<ConstantVector>(II->getOperand(3))) {
+ assert(Mask->getNumOperands() == 16 && "Bad type for intrinsic!");