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Add support for llvm.uadd.with.overflow.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-11-24 01:38:29 +00:00
parent 2cd91804ec
commit def27392c1
2 changed files with 23 additions and 6 deletions
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10
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -4168,13 +4168,16 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
break;
}
case ISD::SADDO: {
case ISD::SADDO:
case ISD::UADDO: {
SDValue LHS = LegalizeOp(Node->getOperand(0));
SDValue RHS = LegalizeOp(Node->getOperand(1));
SDValue Sum = DAG.getNode(ISD::ADD, LHS.getValueType(), LHS, RHS);
MVT OType = SDValue(Node, 1).getValueType();
SDValue Cmp = DAG.getSetCC(OType, Sum, LHS, ISD::SETLT);
SDValue Cmp = DAG.getSetCC(OType, Sum, LHS,
(Node->getOpcode() == ISD::SADDO) ?
ISD::SETLT : ISD::SETULT);
MVT ValueVTs[] = { LHS.getValueType(), OType };
SDValue Ops[] = { Sum, Cmp };
@ -4185,9 +4188,6 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), SDValue(RNode, 1));
break;
}
case ISD::UADDO: {
break;
}
}
assert(Result.getValueType() == Op.getValueType() &&

19
test/CodeGen/Generic/add-with-overflow.ll
View File

@ -3,7 +3,7 @@
@ok = internal constant [4 x i8] c"%d\0A\00"
@no = internal constant [4 x i8] c"no\0A\00"
define i1 @foo(i32 %v1, i32 %v2) nounwind {
define i1 @func1(i32 %v1, i32 %v2) nounwind {
entry:
%t = call {i32, i1} @llvm.sadd.with.overflow.i32(i32 %v1, i32 %v2)
%sum = extractvalue {i32, i1} %t, 0
@ -19,5 +19,22 @@ overflow:
ret i1 false
}
define i1 @func2(i32 %v1, i32 %v2) nounwind {
entry:
%t = call {i32, i1} @llvm.uadd.with.overflow.i32(i32 %v1, i32 %v2)
%sum = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
br i1 %obit, label %overflow, label %normal
normal:
%t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum ) nounwind
ret i1 true
overflow:
%t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
ret i1 false
}
declare i32 @printf(i8*, ...) nounwind
declare {i32, i1} @llvm.sadd.with.overflow.i32(i32, i32)
declare {i32, i1} @llvm.uadd.with.overflow.i32(i32, i32)