[LLVMbugs] [Bug 18294] New: [clang-cl] __asm .align is mishandled?
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Fri Dec 20 11:13:05 PST 2013
http://llvm.org/bugs/show_bug.cgi?id=18294
Bug ID: 18294
Summary: [clang-cl] __asm .align is mishandled?
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangbugs at nondot.org
Reporter: timurrrr at google.com
CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
Classification: Unclassified
$ cat asm.c
void g(void);
void f(void) {
__asm nop;
__asm nop;
__asm align 16;
g();
}
$ clang-cl -c asm.c && dumpbin /DISASM asm.obj
...
_f:
00000000: 55 push ebp
00000001: 89 E5 mov ebp,esp
00000003: 90 nop
00000004: 90 nop
00000005: 0F 1F 00 nop dword ptr [eax]
00000008: E8 00 00 00 00 call _g
...
It looks like the "call" instruction gets aligned by 4, not 16?
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