QiangHuang <qianghuang87@xxxxxxxxx> writes: > "V_MUST_DEF" and "V_MAY_DEF" , The two tags appear in the IL of > SSA in GCC.I know they have something to do with the virtual > operand,however,I wonder that what the exact distinction between them > is. See doc/tree-ssa.texi. But note that in gcc 4.3 the distinction was removed. Now there is only one kind of def. http://gcc.gnu.org/ml/gcc-patches/2006-12/msg00780.html > Corresponding to the 2 tags, is there "V_MUST_USE" or "V_MAY_USE"? No. Ian
