https://bugs.llvm.org/show_bug.cgi?id=35441
Bug ID: 35441
Summary: AsmParser::parseMSInlineAsm() incorrectly assumes
whitespace when rewriting expressions
Product: new-bugs
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: va...@penzin.net
CC: llvm-bugs@lists.llvm.org
Created attachment 19480
--> https://bugs.llvm.org/attachment.cgi?id=19480&action=edit
Patch against revision 319067
Microsoft C/C++ compiler allows the following syntax:
__asm { mov[foo],2017 }
(Note the absence of whitespace between the opcode "mov" and the left bracket.)
AsmParser::parseMSInlineAsm() rewrites the above fragment as "movdword ptr
$0,$$2017" while the expected result is "mov dword ptr $0,$$2017" (note the
whitespace between the opcode "mov" and the size specifier "dword ptr").
To reproduce the above, please consider the following C source (foo.c):
#include <stdint.h>
int
foo ( void )
{
int32_t bar = 0;
__asm {
mov[bar],2017
}
return bar;
}
Please verify generation of the bitcode of the above as follows:
clang-6.0 -S -fasm-blocks -emit-llvm foo.c -o - | grep dword
Please find attached a patch that amends this issue.
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