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Introduce two new "add" intrinsics. These return the sum plus a bit indicating

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that an overflow/carry occured. These are converted into ISD::[SU]ADDO nodes,
which are lowered in a target-independent way into something sane. Eventually,
each target can implement their own method of checking the overflow/carry flags.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59756 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-11-21 00:05:31 +00:00
parent 370387c736
commit e6ed6ecfb0
1 changed files with 9 additions and 0 deletions
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9
include/llvm/Intrinsics.td
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@ -314,6 +314,15 @@ def int_init_trampoline : Intrinsic<[llvm_ptr_ty],
[]>,
GCCBuiltin<"__builtin_init_trampoline">;
//===------------------------ Overflow Intrinsics -------------------------===//
//
// Expose the carry flag from add operations on two integrals.
def int_sadd_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
[LLVMMatchType<0>, LLVMMatchType<0>]>;
def int_uadd_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
[LLVMMatchType<0>, LLVMMatchType<0>]>;
//===------------------------- Atomic Intrinsics --------------------------===//
//
def int_memory_barrier : Intrinsic<[llvm_void_ty],