Inline ptx problem

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello there.

I found problem in inline ptx.
This code will work incorrect:

asm(“bra $label;\n”);

asm(“$label:\n”
“mov.s32 %reg, %0;\n” :: “r”(1234));

in ptx it will:

bra $label;
mov %r, 1234;
$label:
mov.s32 %reg, %r;

1234 will not be loaded to %reg, because program jump across parameters initialization. Is it bug or feature? Maybe more correctly load asm parameters before each instruction or, in the last resort send compilation warning?

Regards.

2

In general it is a bad idea to do this as inline assembly code is supposed to be free of side effects, which the [font=“Courier New”]bra[/font] obviously isn’t. Check out the “Using Inline PTX Assembly in CUDA” document.

EDIT: remove bad code example.

3

Ok, I understood, but may be opencc should output warning in case bra from one asm block to another?