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// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -fnative-half-type -finclude-default-header -Wconversion -verify -o - -DERROR=1 %s
// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -fnative-half-type -finclude-default-header -ast-dump %s | FileCheck %s
// This test verifies floating point type implicit conversion ranks for overload
// resolution. In HLSL the built-in type ranks are half < float < double. This
// applies to both scalar and vector types.
// HLSL allows implicit truncation fo types, so it differentiates between
// promotions (converting to larger types) and conversions (converting to
// smaller types). Promotions are preferred over conversions. Promotions prefer
// promoting to the next lowest type in the ranking order. Conversions prefer
// converting to the next highest type in the ranking order.
void HalfFloatDouble(double D);
void HalfFloatDouble(float F);
void HalfFloatDouble(half H);
// CHECK: FunctionDecl {{.*}} used HalfFloatDouble 'void (double)'
// CHECK: FunctionDecl {{.*}} used HalfFloatDouble 'void (float)'
// CHECK: FunctionDecl {{.*}} used HalfFloatDouble 'void (half)'
void FloatDouble(double D); // expected-note{{candidate function}}
void FloatDouble(float F); // expected-note{{candidate function}}
// CHECK: FunctionDecl {{.*}} used FloatDouble 'void (double)'
// CHECK: FunctionDecl {{.*}} used FloatDouble 'void (float)'
void HalfDouble(double D);
void HalfDouble(half H);
// CHECK: FunctionDecl {{.*}} used HalfDouble 'void (double)'
// CHECK: FunctionDecl {{.*}} used HalfDouble 'void (half)'
void HalfFloat(float F); // expected-note{{candidate function}}
void HalfFloat(half H); // expected-note{{candidate function}}
// CHECK: FunctionDecl {{.*}} used HalfFloat 'void (float)'
// CHECK: FunctionDecl {{.*}} used HalfFloat 'void (half)'
void Double(double D);
void Float(float F);
void Half(half H);
// CHECK: FunctionDecl {{.*}} used Double 'void (double)'
// CHECK: FunctionDecl {{.*}} used Float 'void (float)'
// CHECK: FunctionDecl {{.*}} used Half 'void (half)'
// Case 1: A function declared with overloads for half float and double types.
// (a) When called with half, it will resolve to half because half is an exact
// match.
// (b) When called with float it will resolve to float because float is an
// exact match.
// (c) When called with double it will resolve to double because it is an
// exact match.
// CHECK-LABEL: FunctionDecl {{.*}} Case1 'void (half, float, double)'
void Case1(half H, float F, double D) {
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(half)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (half)' lvalue Function {{.*}} 'HalfFloatDouble' 'void (half)'
HalfFloatDouble(H);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(float)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (float)' lvalue Function {{.*}} 'HalfFloatDouble' 'void (float)'
HalfFloatDouble(F);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'HalfFloatDouble' 'void (double)'
HalfFloatDouble(D);
}
// Case 2: A function declared with double and float overlaods.
// (a) When called with half, it will fail to resolve because it cannot
// disambiguate the promotions.
// (b) When called with float it will resolve to float because float is an
// exact match.
// (c) When called with double it will resolve to double because it is an
// exact match.
// CHECK-LABEL: FunctionDecl {{.*}} Case2 'void (half, float, double)'
void Case2(half H, float F, double D) {
#if ERROR
FloatDouble(H); // expected-error{{call to 'FloatDouble' is ambiguous}}
#endif
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(float)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (float)' lvalue Function {{.*}} 'FloatDouble' 'void (float)'
FloatDouble(F);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'FloatDouble' 'void (double)'
FloatDouble(D);
}
// Case 3: A function declared with half and double overloads
// (a) When called with half, it will resolve to half because it is an exact
// match.
// (b) When called with flaot, it will resolve to double because double is a
// valid promotion.
// (c) When called with double, it will resolve to double because it is an
// exact match.
// CHECK-LABEL: FunctionDecl {{.*}} Case3 'void (half, float, double)'
void Case3(half H, float F, double D) {
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(half)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (half)' lvalue Function {{.*}} 'HalfDouble' 'void (half)'
HalfDouble(H);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'HalfDouble' 'void (double)'
HalfDouble(F);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'HalfDouble' 'void (double)'
HalfDouble(D);
}
// Case 4: A function declared with half and float overloads.
// (a) When called with half, it will resolve to half because half is an exact
// match.
// (b) When called with float it will resolve to float because float is an
// exact match.
// (c) When called with double it will resolve to float because it is the
// float is higher rank than half.
// CHECK-LABEL: FunctionDecl {{.*}} Case4 'void (half, float, double)'
void Case4(half H, float F, double D) {
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(half)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (half)' lvalue Function {{.*}} 'HalfFloat' 'void (half)'
HalfFloat(H);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(float)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (float)' lvalue Function {{.*}} 'HalfFloat' 'void (float)'
HalfFloat(F);
#if ERROR
HalfFloat(D); // expected-error{{call to 'HalfFloat' is ambiguous}}
#endif
}
// Case 5: A function declared with only a double overload.
// (a) When called with half, it will resolve to double because double is a
// valid promotion.
// (b) When called with float it will resolve to double because double is a
// valid promotion.
// (c) When called with double it will resolve to double because it is an
// exact match.
// CHECK-LABEL: FunctionDecl {{.*}} Case5 'void (half, float, double)'
void Case5(half H, float F, double D) {
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'Double' 'void (double)'
Double(H);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'Double' 'void (double)'
Double(F);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (double)' lvalue Function {{.*}} 'Double' 'void (double)'
Double(D);
}
// Case 6: A function declared with only a float overload.
// (a) When called with half, it will resolve to float because float is a
// valid promotion.
// (b) When called with float it will resolve to float because float is an
// exact match.
// (c) When called with double it will resolve to float because it is a
// valid conversion.
// CHECK-LABEL: FunctionDecl {{.*}} Case6 'void (half, float, double)'
void Case6(half H, float F, double D) {
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(float)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (float)' lvalue Function {{.*}} 'Float' 'void (float)'
Float(H);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(float)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (float)' lvalue Function {{.*}} 'Float' 'void (float)'
Float(F);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(float)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (float)' lvalue Function {{.*}} 'Float' 'void (float)'
Float(D); // expected-warning{{implicit conversion loses floating-point precision: 'double' to 'float'}}
}
// Case 7: A function declared with only a half overload.
// (a) When called with half, it will resolve to half because half is an
// exact match
// (b) When called with float it will resolve to half because half is a
// valid conversion.
// (c) When called with double it will resolve to float because it is a
// valid conversion.
// CHECK-LABEL: FunctionDecl {{.*}} Case7 'void (half, float, double)'
void Case7(half H, float F, double D) {
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(half)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (half)' lvalue Function {{.*}} 'Half' 'void (half)'
Half(H);
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(half)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (half)' lvalue Function {{.*}} 'Half' 'void (half)'
Half(F); // expected-warning{{implicit conversion loses floating-point precision: 'float' to 'half'}}
// CHECK: CallExpr {{.*}} 'void'
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(half)' <FunctionToPointerDecay>
// CHECK-NEXT: DeclRefExpr {{.*}} 'void (half)' lvalue Function {{.*}} 'Half' 'void (half)'
Half(D); // expected-warning{{implicit conversion loses floating-point precision: 'double' to 'half'}}
}
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