http://llvm.org/bugs/show_bug.cgi?id=20052
Bug ID: 20052
Summary: __declspec(naked) functions run out of registers
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following function (reduced from some nss code) builds with cl but not with
clang-cl
int s_mpi_is_sse2();
__declspec(naked)
void s_mpv_mul_d( )
{
__asm {
call s_mpi_is_sse2
lodsd ; []
mov edx,[0]
mov ebx,0
stosd ; []
dec ecx
}
}
In this case we emit code that does the following for the call
0: bf 00 00 00 00 movl $0, %edi
5: ff d7 calll *%edi
We should really be doing this call directly instead of doing it indirectly.
This would save us from needing the extra registers.
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