nvptx: Extend 'brev' test cases
In order to observe effects of a later patch, extend the 'brev' test cases
added in commit
c09471fbc7588db2480f036aa56a2403d3c03ae5
"nvptx: Add suppport for __builtin_nvptx_brev instrinsic".
gcc/testsuite/
* gcc.target/nvptx/brev-1.c: Extend.
* gcc.target/nvptx/brev-2.c: Rename to...
* gcc.target/nvptx/brev-2-O2.c: ... this, and extend. Copy to...
* gcc.target/nvptx/brev-2-O0.c: ... this, and adapt for '-O0'.
* gcc.target/nvptx/brevll-1.c: Extend.
* gcc.target/nvptx/brevll-2.c: Rename to...
* gcc.target/nvptx/brevll-2-O2.c: ... this, and extend. Copy to...
* gcc.target/nvptx/brevll-2-O0.c: ... this, and adapt for '-O0'.