On 16.02.2016 15:03, Jan Hubicka wrote:
>> @example
>> -/* Note that this code will not compile with -masm=intel */
>> -#define DebugBreak() asm("int $3")
>> +/* Define macro at file scope with basic asm. */
>> +/* Add macro parameter p to eax. */
>> +asm(".macro test p\n\t"
>> + "addl $\\p, %eax\n\t"
>> + ".endm");
>> +
>> +/* Use macro in function using extended asm. It needs */
>> +/* the "cc" clobber since the flags are changed and uses */
>> +/* the "a" constraint since it modifies eax. */
>> +int DoAdd(int value)
>> +@{
>> + asm("test 5" : "+a" (value) : : "cc");
>> + return value;
>> +@}
>
> To make this work you need the .macro appear before all uses in the asm
> files. I do not think
> we really promise that wihtout -fno-toplevel-reorder -fno-lto
>
> Honza
>
And, isn't "test" an assembler instruction name?
What if the compiler emits something like test %eax,1
somewhere in the same translation unit?
Bernd.
