wuzish updated this revision to Diff 170871.
wuzish marked 2 inline comments as done.
wuzish added a comment.
Updated the diff.
fix some points from comments.
https://reviews.llvm.org/D53417
Files:
clang/lib/Sema/SemaOverload.cpp
clang/test/Sema/altivec-generic-overload.c
Index: clang/test/Sema/altivec-generic-overload.c
===================================================================
--- /dev/null
+++ clang/test/Sema/altivec-generic-overload.c
@@ -0,0 +1,101 @@
+// RUN: %clang_cc1 %s -triple=powerpc64le-unknown-linux -target-feature +altivec -target-feature +vsx -verify -verify-ignore-unexpected=note -pedantic -fsyntax-only
+
+typedef signed char __v16sc __attribute__((__vector_size__(16)));
+typedef unsigned char __v16uc __attribute__((__vector_size__(16)));
+typedef signed short __v8ss __attribute__((__vector_size__(16)));
+typedef unsigned short __v8us __attribute__((__vector_size__(16)));
+typedef signed int __v4si __attribute__((__vector_size__(16)));
+typedef unsigned int __v4ui __attribute__((__vector_size__(16)));
+typedef signed long long __v2sll __attribute__((__vector_size__(16)));
+typedef unsigned long long __v2ull __attribute__((__vector_size__(16)));
+typedef signed __int128 __v1slll __attribute__((__vector_size__(16)));
+typedef unsigned __int128 __v1ulll __attribute__((__vector_size__(16)));
+typedef float __v4f __attribute__((__vector_size__(16)));
+typedef double __v2d __attribute__((__vector_size__(16)));
+
+void __attribute__((__overloadable__)) convert1(vector signed char);
+void __attribute__((__overloadable__)) convert1(vector unsigned char);
+void __attribute__((__overloadable__)) convert1(vector signed short);
+void __attribute__((__overloadable__)) convert1(vector unsigned short);
+void __attribute__((__overloadable__)) convert1(vector signed int);
+void __attribute__((__overloadable__)) convert1(vector unsigned int);
+void __attribute__((__overloadable__)) convert1(vector signed long long);
+void __attribute__((__overloadable__)) convert1(vector unsigned long long);
+void __attribute__((__overloadable__)) convert1(vector signed __int128);
+void __attribute__((__overloadable__)) convert1(vector unsigned __int128);
+void __attribute__((__overloadable__)) convert1(vector float);
+void __attribute__((__overloadable__)) convert1(vector double);
+void __attribute__((__overloadable__)) convert1(vector bool int);
+void __attribute__((__overloadable__)) convert1(vector pixel short);
+void __attribute__((__overloadable__)) convert2(__v16sc);
+void __attribute__((__overloadable__)) convert2(__v16uc);
+void __attribute__((__overloadable__)) convert2(__v8ss);
+void __attribute__((__overloadable__)) convert2(__v8us);
+void __attribute__((__overloadable__)) convert2(__v4si);
+void __attribute__((__overloadable__)) convert2(__v4ui);
+void __attribute__((__overloadable__)) convert2(__v2sll);
+void __attribute__((__overloadable__)) convert2(__v2ull);
+void __attribute__((__overloadable__)) convert2(__v1slll);
+void __attribute__((__overloadable__)) convert2(__v1ulll);
+void __attribute__((__overloadable__)) convert2(__v4f);
+void __attribute__((__overloadable__)) convert2(__v2d);
+
+void test()
+{
+ __v16sc gv1;
+ __v16uc gv2;
+ __v8ss gv3;
+ __v8us gv4;
+ __v4si gv5;
+ __v4ui gv6;
+ __v2sll gv7;
+ __v2ull gv8;
+ __v1slll gv9;
+ __v1ulll gv10;
+ __v4f gv11;
+ __v2d gv12;
+
+ vector signed char av1;
+ vector unsigned char av2;
+ vector signed short av3;
+ vector unsigned short av4;
+ vector signed int av5;
+ vector unsigned int av6;
+ vector signed long long av7;
+ vector unsigned long long av8;
+ vector signed __int128 av9;
+ vector unsigned __int128 av10;
+ vector float av11;
+ vector double av12;
+ vector bool int av13;
+ vector pixel short av14;
+
+ convert1(gv1);
+ convert1(gv2);
+ convert1(gv3);
+ convert1(gv4);
+ convert1(gv5);
+ convert1(gv6);
+ convert1(gv7);
+ convert1(gv8);
+ convert1(gv9);
+ convert1(gv10);
+ convert1(gv11);
+ convert1(gv12);
+
+ convert2(av1);
+ convert2(av2);
+ convert2(av3);
+ convert2(av4);
+ convert2(av5);
+ convert2(av6);
+ convert2(av7);
+ convert2(av8);
+ convert2(av9);
+ convert2(av10);
+ convert2(av11);
+ convert2(av12);
+ convert2(av13); // expected-error {{call to 'convert2' is ambiguous}}
+ convert2(av14); // expected-error {{call to 'convert2' is ambiguous}}
+
+}
Index: clang/lib/Sema/SemaOverload.cpp
===================================================================
--- clang/lib/Sema/SemaOverload.cpp
+++ clang/lib/Sema/SemaOverload.cpp
@@ -3900,6 +3900,56 @@
S.Context.getTypeSize(SCS1.getToType(2)))
return ImplicitConversionSequence::Better;
+ // For now only conversions with altivec-related kind and generic kind
+ // prefer to choose a compatible vector conversion
+ // FIXME: Can remove this constraint and extend to other vector kind?
+ auto IsPreferCompatibleConversionVectorKind =
+ [&S](const StandardConversionSequence &SCS1,
+ const StandardConversionSequence &SCS2) {
+ QualType Types[] = {SCS1.getFromType(), SCS1.getToType(2),
+ SCS2.getFromType(), SCS2.getToType(2)};
+
+ for (auto Type : Types) {
+ if (S.Context.getCanonicalType(Type)->getTypeClass() != Type::Vector)
+ return false;
+ VectorType::VectorKind Kind =
+ Type->castAs<VectorType>()->getVectorKind();
+ if (Kind != VectorType::AltiVecVector &&
+ Kind != VectorType::AltiVecPixel &&
+ Kind != VectorType::AltiVecBool &&
+ Kind != VectorType::GenericVector)
+ return false;
+ }
+
+ return true;
+ };
+
+ // Prefer a compatible vector conversion over a lax vector conversion
+ // For example:
+ //
+ // typedef float __v4sf __attribute__((__vector_size__(16)));
+ // void f(vector float);
+ // void f(vector signed int);
+ // int main() {
+ // __v4sf a;
+ // f(a);
+ // }
+ // Here, we'd like to choose f(vector float) and not
+ // report an ambiguous call error
+ if (SCS1.Second == ICK_Vector_Conversion &&
+ SCS2.Second == ICK_Vector_Conversion &&
+ IsPreferCompatibleConversionVectorKind(SCS1, SCS2)) {
+ bool SCS1IsCompatibleVectorConversion = S.Context.areCompatibleVectorTypes(
+ SCS1.getFromType(), SCS1.getToType(2));
+ bool SCS2IsCompatibleVectorConversion = S.Context.areCompatibleVectorTypes(
+ SCS2.getFromType(), SCS2.getToType(2));
+
+ if (SCS1IsCompatibleVectorConversion != SCS2IsCompatibleVectorConversion)
+ return SCS1IsCompatibleVectorConversion
+ ? ImplicitConversionSequence::Better
+ : ImplicitConversionSequence::Worse;
+ }
+
return ImplicitConversionSequence::Indistinguishable;
}
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