rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Support memcpy/memmove with differing src/dst alignment

Browse Source 
If LLVM 7 is used, generate memcpy/memmove with differing
src/dst alignment. I've added new FFI functions to construct
these through the builder API, which is more convenient than
dealing with differing intrinsic signatures depending on the
LLVM version.
This commit is contained in:
Nikita Popov
2018-11-02 23:38:16 +01:00
parent ac708826b0
commit 463ad9098e
11 changed files with 98 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
src/rustllvm/RustWrapper.cpp
View File

@@ -1239,6 +1239,40 @@ extern "C" LLVMValueRef LLVMRustBuildCall(LLVMBuilderRef B, LLVMValueRef Fn,
unwrap(Fn), makeArrayRef(unwrap(Args), NumArgs), Bundles, Name));
}
extern "C" LLVMValueRef LLVMRustBuildMemCpy(LLVMBuilderRef B,
LLVMValueRef Dst, unsigned DstAlign,
LLVMValueRef Src, unsigned SrcAlign,
LLVMValueRef Size, bool IsVolatile) {
#if LLVM_VERSION_GE(7, 0)
return wrap(unwrap(B)->CreateMemCpy(
unwrap(Dst), DstAlign,
unwrap(Src), SrcAlign,
unwrap(Size), IsVolatile));
#else
unsigned Align = std::min(DstAlign, SrcAlign);
return wrap(unwrap(B)->CreateMemCpy(
unwrap(Dst), unwrap(Src),
unwrap(Size), Align, IsVolatile));
#endif
}
extern "C" LLVMValueRef LLVMRustBuildMemMove(LLVMBuilderRef B,
LLVMValueRef Dst, unsigned DstAlign,
LLVMValueRef Src, unsigned SrcAlign,
LLVMValueRef Size, bool IsVolatile) {
#if LLVM_VERSION_GE(7, 0)
return wrap(unwrap(B)->CreateMemMove(
unwrap(Dst), DstAlign,
unwrap(Src), SrcAlign,
unwrap(Size), IsVolatile));
#else
unsigned Align = std::min(DstAlign, SrcAlign);
return wrap(unwrap(B)->CreateMemMove(
unwrap(Dst), unwrap(Src),
unwrap(Size), Align, IsVolatile));
#endif
}
extern "C" LLVMValueRef
LLVMRustBuildInvoke(LLVMBuilderRef B, LLVMValueRef Fn, LLVMValueRef *Args,
unsigned NumArgs, LLVMBasicBlockRef Then,