https://bugs.llvm.org/show_bug.cgi?id=49040
Bug ID: 49040
Summary: ms: _byteswap_ulong etc intrinsic generate calls
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Headers
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
$ cat bswap.cc
#include <stdint.h>
#include <intrin.h>
int32_t ByteSwap(uint32_t x) {
return _byteswap_ulong(x);
}
$ out/gn/bin/clang-cl /FA /c bswap.cc /O2 /winsysroot
~/src/chrome/src/third_party/depot_tools/win_toolchain/vs_files/782813b4eb/
$ cat bswap.asm
...
"?ByteSwap@@YAHI@Z": # @"?ByteSwap@@YAHI@Z"
# %bb.0: # %entry
jmp _byteswap_ulong # TAILCALL
# -- End function
Compare to https://godbolt.org/z/97YjTT in MSVC.
Our clang/lib/Headers/intrin.h only has a declaration for these functions in
arm64 mode for some reason. So how does this even build? => Windows
Kits/10/Include/10.0.19041.0/ucrt/stdlib.h declares these too.
So I guess we should put these in intrin.h, with an inline definition?
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