http://llvm.org/bugs/show_bug.cgi?id=3345
Summary: clang rejects asm code accepted by gcc and icc
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Semantic Analyzer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
This code comes straight from the Linux kernel.
$ cat /tmp/bug2.c
unsigned long __clear_user(void *addr, unsigned long size)
{
long __d0;
asm volatile(
" testq %[size8],%[size8]\n"
" jz 4f\n"
"0: movq %[zero],(%[dst])\n"
" addq %[eight],%[dst]\n"
" decl %%ecx ; jnz 0b\n"
"4: movq %[size1],%%rcx\n"
" testl %%ecx,%%ecx\n"
" jz 2f\n"
"1: movb %b[zero],(%[dst])\n"
" incq %[dst]\n"
" decl %%ecx ; jnz 1b\n"
"2:\n"
".section .fixup,\"ax\"\n"
"3: lea 0(%[size1],%[size8],8),%[size8]\n"
" jmp 2b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,3b\n"
" .quad 1b,2b\n"
".previous"
: [size8] "=c"(size), [dst] "=&D" (__d0)
: [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr),
[zero] "r" (0UL), [eight] "r" (8UL));
return size;
}
$ gcc -w -c /tmp/bug2.c
$ icc -w -c /tmp/bug2.c
$ clang /tmp/bug2.c
/tmp/bug2.c:29:28: error: invalid input constraint '[size8]' in asm
: [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr),
^
1 diagnostic generated.
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