https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481
--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> --- Author: segher Date: Fri Aug 23 22:19:40 2019 New Revision: 274889 URL: https://gcc.gnu.org/viewcvs?rev=274889&root=gcc&view=rev Log: rs6000: New darn testcase (PR91481) We used to implement darn with unspecs, not unspec_volatiles, which means two darn instructions could be CSEd together. This testcase tests it by adding together four random numbers. If all is well that means we get four darn instructions, because such a small loop is unrolled fine at -O2 already. If things go bad, combine will combine it all to one darn and a shift left by two. gcc/testsuite/ PR target/91481 * gcc.target/powerpc/darn-3.c: New testcase. Added: trunk/gcc/testsuite/gcc.target/powerpc/darn-3.c Modified: trunk/gcc/testsuite/ChangeLog
