ranjith kumar <ranjit_kumar_b4u@xxxxxxxxxxx> writes: > 1) In my P.C. gcc version 4.1.2 has been installed. > I have a look at http://gcc.gnu.org/. > In that it is said that 4.1.2 is the "current > release series", "Next release series: GCC 4.2.0" and > "Active development: GCC 4.3.0" > > What does it mean? Has gcc 4.2.0/4.3.0 been > released??? No. It means that 4.2 is the next release. 4.3 is under active development. > > 2)From which version "auto-vectorization" has been > included? > In > http://gcc.gnu.org/projects/tree-ssa/vectorization.html#status4.0 > it is said that gcc 4.0 also does > "auto-vectorization". > Deos it mean auto-vectorization cababilities of gcc4.0 > and gcc4.1/4.2 are same?? No, it is under active development and is enhanced in each release. > 3)-ftree-vectorize is the flag that enables > autovectorization. isn't it?? Yes. > 4) where can I get C programs for which gcc can do > autovectorization and for which it cant? There are test cases in gcc/testsuite/gcc.dg/vect. > 4) I know all languages are internallay converted to > same representation(in the context of gcc compiler). > So what is said in gcc manuals about > auto-vectorization is applicable to all languages gcc > supports. Isn't it? Yes. But some languages are more amenable to vectorization than others. Ian
