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[flang] Don't warn on (0.,0.)**(nonzero noninteger) #145179

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Merged
merged 1 commit into from
Jun 30, 2025
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[flang] Don't warn on (0.,0.)**(nonzero noninteger) #145179

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2 changes: 1 addition & 1 deletion flang/include/flang/Evaluate/complex.h
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ template <typename REAL_TYPE> class Complex {
im_.Compare(that.im_) == Relation::Equal;
}

constexpr bool IsZero() const { return re_.IsZero() || im_.IsZero(); }
constexpr bool IsZero() const { return re_.IsZero() && im_.IsZero(); }

constexpr bool IsInfinite() const {
return re_.IsInfinite() || im_.IsInfinite();
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9 changes: 8 additions & 1 deletion flang/lib/Evaluate/fold-implementation.h
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Expand Up @@ -2156,7 +2156,14 @@ Expr<T> FoldOperation(FoldingContext &context, Power<T> &&x) {
}
return Expr<T>{Constant<T>{power.power}};
} else {
if (auto callable{GetHostRuntimeWrapper<T, T, T>("pow")}) {
if (folded->first.IsZero()) {
if (folded->second.IsZero()) {
context.messages().Say(common::UsageWarning::FoldingException,
"REAL/COMPLEX 0**0 is not defined"_warn_en_US);
} else {
return Expr<T>(Constant<T>{folded->first}); // 0. ** nonzero -> 0.
}
} else if (auto callable{GetHostRuntimeWrapper<T, T, T>("pow")}) {
return Expr<T>{
Constant<T>{(*callable)(context, folded->first, folded->second)}};
} else if (context.languageFeatures().ShouldWarn(
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17 changes: 17 additions & 0 deletions flang/test/Semantics/bug1046.f90
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@@ -0,0 +1,17 @@
! RUN: %python %S/test_errors.py %s %flang_fc1 -pedantic -Werror
!WARNING: INTEGER(4) 0**0 is not defined
print *, 0**0
!WARNING: REAL/COMPLEX 0**0 is not defined
print *, 0**0.
!WARNING: invalid argument on power with INTEGER exponent
print *, 0.0**0
!WARNING: REAL/COMPLEX 0**0 is not defined
print *, 0.0**0.
!WARNING: invalid argument on power with INTEGER exponent
print *, (0.0, 0.0)**0
!WARNING: REAL/COMPLEX 0**0 is not defined
print *, (0.0, 0.0)**0.
print *, (0.0, 0.0)**2.5
end


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