https://bugs.llvm.org/show_bug.cgi?id=41503
Bug ID: 41503
Summary: Clang header file invpcidintrin.h does not compile
with vectorcall ABI
Product: clang
Version: 8.0
Hardware: PC
OS: Windows 2000
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: code.optimi...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
Given the following trivial example:
Win64$ cat test_imm_vectorcall.c
#include <intrin.h>
int f(int i, int j) { return i+j; }
Win64$
It will not compile with the combination of vectorcall ABI and -march/-mtune =
skylake-avx512:
/c/Users/dparks/LLVM-8.0.0/bin/clang -c -c -mtune=skylake-avx512
-march=skylake-avx512 -Xclang -fdefault-calling-conv=vectorcall
test_imm_vectorcall.c
In file included from test_imm_vectorcall.c:1:
c:\Users\dparks\LLVM-8.0.0\lib\clang\8.0.0\include\intrin.h:181:14: error:
function declared 'cdecl' here was previously declared without calling
convention
void __cdecl _invpcid(unsigned int, void *);
^
c:\Users\dparks\LLVM-8.0.0\lib\clang\8.0.0\include\invpcidintrin.h:33:1: note:
previous declaration is here
_invpcid(unsigned int __type, void *__descriptor) {
^
1 error generated.
This problem also occurs with Clang 7.0.1, but does not occur with Clang 6.0.0.
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