Marks a block with a scope-unique identifier.
The #pragma loopid directive must immediately precede a #pragma block_loop directive or for loop. The specified name can be used by #pragma block_loop to control transformations on that loop. It can also be used to provide information on loop transformations through the use of the -qreport compiler option.
You must not specify #pragma loopid more than once for a given loop.
For examples of #pragma loopid usage, see #pragma block_loop.