derek.holloway
7502bf64a4
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61 lines
2.5 KiB
C
61 lines
2.5 KiB
C
// RUN: %clang_cc1 -ast-dump %s | FileCheck %s
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/* WG14 N1365: Clang 16
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* Constant expressions
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*/
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// Note: we don't allow you to expand __FLT_EVAL_METHOD__ in the presence of a
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// pragma that changes its value. However, we can test that we have the correct
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// constant expression behavior by testing that the AST has the correct implicit
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// casts, which also specify that the cast was inserted due to an evaluation
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// method requirement.
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void func(void) {
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{
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#pragma clang fp eval_method(double)
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_Static_assert(123.0F * 2.0F == 246.0F, "");
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// CHECK: StaticAssertDecl
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// CHECK-NEXT: ImplicitCastExpr {{.*}} '_Bool' <IntegralToBoolean>
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// CHECK-NEXT: BinaryOperator {{.*}} 'int' '=='
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// CHECK-NEXT: BinaryOperator {{.*}} 'double' '*' FPEvalMethod=1
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'double' <FloatingCast> FPEvalMethod=1
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// CHECK-NEXT: FloatingLiteral
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'double' <FloatingCast> FPEvalMethod=1
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// CHECK-NEXT: FloatingLiteral
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// Ensure that a cast removes the extra precision.
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_Static_assert(123.0F * 2.0F == 246.0F, "");
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// CHECK: StaticAssertDecl
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// CHECK-NEXT: ImplicitCastExpr {{.*}} '_Bool' <IntegralToBoolean>
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// CHECK-NEXT: BinaryOperator {{.*}} 'int' '=='
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// CHECK-NEXT: BinaryOperator {{.*}} 'double' '*' FPEvalMethod=1
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'double' <FloatingCast> FPEvalMethod=1
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// CHECK-NEXT: FloatingLiteral
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'double' <FloatingCast> FPEvalMethod=1
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// CHECK-NEXT: FloatingLiteral
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}
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{
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#pragma clang fp eval_method(extended)
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_Static_assert(123.0F * 2.0F == 246.0F, "");
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// CHECK: StaticAssertDecl
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// CHECK-NEXT: ImplicitCastExpr {{.*}} '_Bool' <IntegralToBoolean>
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// CHECK-NEXT: BinaryOperator {{.*}} 'int' '=='
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// CHECK-NEXT: BinaryOperator {{.*}} 'long double' '*' FPEvalMethod=2
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'long double' <FloatingCast> FPEvalMethod=2
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// CHECK-NEXT: FloatingLiteral
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'long double' <FloatingCast> FPEvalMethod=2
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// CHECK-NEXT: FloatingLiteral
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}
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{
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#pragma clang fp eval_method(source)
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_Static_assert(123.0F * 2.0F == 246.0F, "");
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// CHECK: StaticAssertDecl
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// CHECK-NEXT: ImplicitCastExpr {{.*}} '_Bool' <IntegralToBoolean>
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// CHECK-NEXT: BinaryOperator {{.*}} 'int' '=='
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// CHECK-NEXT: BinaryOperator {{.*}} 'float' '*' FPEvalMethod=0
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// CHECK-NEXT: FloatingLiteral
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// CHECK-NEXT: FloatingLiteral
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}
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}
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