On Thu, Dec 8, 2011 at 1:26 PM, Martin Jambor <mjam...@suse.cz> wrote: > Hi, > > On Thu, Dec 08, 2011 at 10:38:24AM +0100, Feng LI wrote: >> Hi, >> >> I'm building a function with >> fread = build_decl (LOCATION, FUNCTION_DECL, get_identifier (name), type); >> >> and then use it in gimple with >> gimple gfread = gimple_build_call (fread, 1, offset); >> gimple_call_set_lhs (fread, lhs); >> >> But I need a cast here, since the lhs has a different type than the return >> value >> of the function fread. So I suppose that I need a cast here to cast from the >> return type of fread -> type_of (lhs). But I've no idea how could I >> achieve this? >> Any suggestions? > > You need to store the result into a temporary and then add a > VIEW_CONVERT_EXPR gimple assignment statement after the statement to > convert to the necessary type. Grep *.c files for > 'build.*VIEW_CONVERT_EXPR' and you should be able to find some example > to follow in your own code.
A traditional cast is a NOP_EXPR. If you really need a VIEW_CONVERT_EXPR then this is more like a *(T' *)&t operation. Richard. > Martin
