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Extend ConstantFolding to understand signed overflow variants
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83338 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -678,6 +678,8 @@ llvm::canConstantFoldCallTo(const Function *F) {
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case Intrinsic::cttz:
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case Intrinsic::uadd_with_overflow:
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case Intrinsic::usub_with_overflow:
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case Intrinsic::sadd_with_overflow:
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case Intrinsic::ssub_with_overflow:
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return true;
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default:
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return false;
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@ -902,6 +904,28 @@ llvm::ConstantFoldCall(Function *F,
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};
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return ConstantStruct::get(F->getContext(), Ops, 2, false);
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}
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case Intrinsic::sadd_with_overflow: {
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Constant *Res = ConstantExpr::getAdd(Op1, Op2); // result.
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Constant *Overflow = ConstantExpr::getSelect(
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ConstantExpr::getICmp(CmpInst::ICMP_SGT,
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ConstantInt::get(Op1->getType(), 0), Op1),
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ConstantExpr::getICmp(CmpInst::ICMP_SGT, Res, Op2),
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ConstantExpr::getICmp(CmpInst::ICMP_SLT, Res, Op2)); // overflow.
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Constant *Ops[] = { Res, Overflow };
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return ConstantStruct::get(F->getContext(), Ops, 2, false);
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}
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case Intrinsic::ssub_with_overflow: {
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Constant *Res = ConstantExpr::getSub(Op1, Op2); // result.
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Constant *Overflow = ConstantExpr::getSelect(
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ConstantExpr::getICmp(CmpInst::ICMP_SGT,
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ConstantInt::get(Op2->getType(), 0), Op2),
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ConstantExpr::getICmp(CmpInst::ICMP_SLT, Res, Op1),
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ConstantExpr::getICmp(CmpInst::ICMP_SGT, Res, Op1)); // overflow.
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Constant *Ops[] = { Res, Overflow };
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return ConstantStruct::get(F->getContext(), Ops, 2, false);
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}
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}
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}
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@ -24,7 +24,6 @@ entry:
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; CHECK: ret %i8i1 { i8 6, i1 true }
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}
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;;-----------------------------
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;; usub
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;;-----------------------------
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@ -47,7 +46,127 @@ entry:
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; CHECK: ret %i8i1 { i8 -2, i1 true }
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}
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;;-----------------------------
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;; sadd
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;;-----------------------------
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define {i8, i1} @sadd_1() nounwind {
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entry:
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%t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 42, i8 2)
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ret {i8, i1} %t
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; CHECK: @sadd_1
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; CHECK: ret %i8i1 { i8 44, i1 false }
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}
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define {i8, i1} @sadd_2() nounwind {
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entry:
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%t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 120, i8 10)
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ret {i8, i1} %t
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; CHECK: @sadd_2
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; CHECK: ret %i8i1 { i8 -126, i1 true }
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}
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define {i8, i1} @sadd_3() nounwind {
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entry:
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%t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 -120, i8 10)
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ret {i8, i1} %t
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; CHECK: @sadd_3
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; CHECK: ret %i8i1 { i8 -110, i1 false }
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}
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define {i8, i1} @sadd_4() nounwind {
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entry:
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%t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 -120, i8 -10)
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ret {i8, i1} %t
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; CHECK: @sadd_4
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; CHECK: ret %i8i1 { i8 126, i1 true }
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}
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define {i8, i1} @sadd_5() nounwind {
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entry:
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%t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 2, i8 -10)
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ret {i8, i1} %t
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; CHECK: @sadd_5
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; CHECK: ret %i8i1 { i8 -8, i1 false }
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}
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;;-----------------------------
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;; ssub
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;;-----------------------------
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define {i8, i1} @ssub_1() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 4, i8 2)
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ret {i8, i1} %t
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; CHECK: @ssub_1
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; CHECK: ret %i8i1 { i8 2, i1 false }
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}
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define {i8, i1} @ssub_2() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 4, i8 6)
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ret {i8, i1} %t
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; CHECK: @ssub_2
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; CHECK: ret %i8i1 { i8 -2, i1 false }
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}
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define {i8, i1} @ssub_3() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 -10, i8 120)
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ret {i8, i1} %t
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; CHECK: @ssub_3
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; CHECK: ret %i8i1 { i8 126, i1 true }
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}
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define {i8, i1} @ssub_3b() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 -10, i8 10)
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ret {i8, i1} %t
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; CHECK: @ssub_3b
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; CHECK: ret %i8i1 { i8 -20, i1 false }
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}
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define {i8, i1} @ssub_4() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 120, i8 -10)
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ret {i8, i1} %t
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; CHECK: @ssub_4
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; CHECK: ret %i8i1 { i8 -126, i1 true }
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}
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define {i8, i1} @ssub_4b() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 20, i8 -10)
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ret {i8, i1} %t
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; CHECK: @ssub_4b
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; CHECK: ret %i8i1 { i8 30, i1 false }
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}
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define {i8, i1} @ssub_5() nounwind {
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entry:
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%t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 -20, i8 -10)
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ret {i8, i1} %t
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; CHECK: @ssub_5
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; CHECK: ret %i8i1 { i8 -10, i1 false }
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}
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declare {i8, i1} @llvm.uadd.with.overflow.i8(i8, i8)
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declare {i8, i1} @llvm.usub.with.overflow.i8(i8, i8)
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declare {i8, i1} @llvm.sadd.with.overflow.i8(i8, i8)
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declare {i8, i1} @llvm.ssub.with.overflow.i8(i8, i8)
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