LegalizeDAG: allow libcalls for max/min atomic operations
ARM processors without ldrex/strex need to be able to make libcalls for all
atomic operations, including the newer min/max versions.
The alternative would probably be expanding these operations in terms of
cmpxchg (as x86 does always), but in the configurations where this matters
code-size tends to be paramount so the libcall is more desirable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193398 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index aa8caed..1f112e9 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2734,6 +2734,46 @@
case MVT::i128:LC = RTLIB::SYNC_FETCH_AND_NAND_16;break;
}
break;
+ case ISD::ATOMIC_LOAD_MAX:
+ switch (VT.SimpleTy) {
+ default: llvm_unreachable("Unexpected value type for atomic!");
+ case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_MAX_1; break;
+ case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_MAX_2; break;
+ case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_MAX_4; break;
+ case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_MAX_8; break;
+ case MVT::i128:LC = RTLIB::SYNC_FETCH_AND_MAX_16;break;
+ }
+ break;
+ case ISD::ATOMIC_LOAD_UMAX:
+ switch (VT.SimpleTy) {
+ default: llvm_unreachable("Unexpected value type for atomic!");
+ case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_UMAX_1; break;
+ case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_UMAX_2; break;
+ case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_UMAX_4; break;
+ case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_UMAX_8; break;
+ case MVT::i128:LC = RTLIB::SYNC_FETCH_AND_UMAX_16;break;
+ }
+ break;
+ case ISD::ATOMIC_LOAD_MIN:
+ switch (VT.SimpleTy) {
+ default: llvm_unreachable("Unexpected value type for atomic!");
+ case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_MIN_1; break;
+ case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_MIN_2; break;
+ case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_MIN_4; break;
+ case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_MIN_8; break;
+ case MVT::i128:LC = RTLIB::SYNC_FETCH_AND_MIN_16;break;
+ }
+ break;
+ case ISD::ATOMIC_LOAD_UMIN:
+ switch (VT.SimpleTy) {
+ default: llvm_unreachable("Unexpected value type for atomic!");
+ case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_UMIN_1; break;
+ case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_UMIN_2; break;
+ case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_UMIN_4; break;
+ case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_UMIN_8; break;
+ case MVT::i128:LC = RTLIB::SYNC_FETCH_AND_UMIN_16;break;
+ }
+ break;
}
return ExpandChainLibCall(LC, Node, false);