Magic-Mirror/llvm-capstone
1
0
Fork 0
mirror of https://github.com/capstone-engine/llvm-capstone.git synced 2024-12-03 03:11:27 +00:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

x86-64 ABI: unwrap single element structs / arrays of 256-bit vectors to pass and return in registers

Browse Source 
This is a patch for PR22563 ( http://llvm.org/bugs/show_bug.cgi?id=22563 ).

We were not correctly unwrapping a single 256-bit AVX vector that was defined as an array of 1 inside a struct.

We would generate a <4 x float> param/return value instead of <8 x float> and lose half of the vector.

Differential Revision: http://reviews.llvm.org/D7614

llvm-svn: 229408
This commit is contained in:
Sanjay Patel 2015-02-16 17:26:51 +00:00
parent e7f4f86dff
commit eb2af4e8b1
2 changed files with 29 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
clang/lib/CodeGen/TargetInfo.cpp
View File

@ -2183,19 +2183,15 @@ ABIArgInfo X86_64ABIInfo::getIndirectResult(QualType Ty,
return ABIArgInfo::getIndirect(Align);
}
/// GetByteVectorType - The ABI specifies that a value should be passed in an
/// full vector XMM/YMM register. Pick an LLVM IR type that will be passed as a
/// vector register.
/// The ABI specifies that a value should be passed in a full vector XMM/YMM
/// register. Pick an LLVM IR type that will be passed as a vector register.
llvm::Type *X86_64ABIInfo::GetByteVectorType(QualType Ty) const {
llvm::Type *IRType = CGT.ConvertType(Ty);
// Wrapper structs/arrays that only contain vectors are passed just like
// vectors; strip them off if present.
if (const Type *InnerTy = isSingleElementStruct(Ty, getContext()))
Ty = QualType(InnerTy, 0);
// Wrapper structs that just contain vectors are passed just like vectors,
// strip them off if present.
llvm::StructType *STy = dyn_cast<llvm::StructType>(IRType);
while (STy && STy->getNumElements() == 1) {
IRType = STy->getElementType(0);
STy = dyn_cast<llvm::StructType>(IRType);
}
llvm::Type *IRType = CGT.ConvertType(Ty);
// If the preferred type is a 16-byte vector, prefer to pass it.
if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(IRType)){

22
clang/test/CodeGen/x86_64-arguments.c
View File

@ -184,6 +184,28 @@ struct v4f32wrapper f27(struct v4f32wrapper X) {
return X;
}
// PR22563 - We should unwrap simple structs and arrays to pass
// and return them in the appropriate vector registers if possible.
typedef float v8f32 __attribute__((__vector_size__(32)));
struct v8f32wrapper {
v8f32 v;
};
struct v8f32wrapper f27a(struct v8f32wrapper X) {
// AVX-LABEL: define <8 x float> @f27a(<8 x float> %X.coerce)
return X;
}
struct v8f32wrapper_wrapper {
v8f32 v[1];
};
struct v8f32wrapper_wrapper f27b(struct v8f32wrapper_wrapper X) {
// AVX-LABEL: define <8 x float> @f27b(<8 x float> %X.coerce)
return X;
}
// rdar://5711709
struct f28c {
double x;