https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70048
--- Comment #17 from Wilco <wdijkstr at arm dot com> --- (In reply to Jiong Wang from comment #16) > * for the second patch at #c10, if we always do the following no matter > op0 is virtual & eliminable or not > > "op1 = force_operand (op1, NULL_RTX);" > > then there is no performance regression as well. Even more, there is > significant perf improvement beyond current trunk on one benchmark. I ran this modified patch through a few benchmarks and there are no regressions. The codesize of SPEC2006 reduces significantly in several cases (-0.25%), while there are only 2 minor increases of +0.02%, so the patch reduces instruction counts quite effectively. So we should go with the modified patch for GCC6.
