Seems like a new change in LLVM has made it so that bitcast of bitcast i8* %1 to %Foo* meaningless? If I'm correct is there any need for the bitcast anymore? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150417/e5bfbc64/attachment.html>
Hi Dave, You can still bitcast between i32 and float, for example. Cheers, James On Fri, 17 Apr 2015 at 09:03 Dave Pitsbawn <dpitsbawn at gmail.com> wrote:> Seems like a new change in LLVM has made it so that bitcast of bitcast i8* > %1 to %Foo* meaningless? > > If I'm correct is there any need for the bitcast anymore? > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150417/854e46d0/attachment.html>
I always thought that bitcast was a no-op internal llvm thing to fit the IR type system. I currently use sitofp, but I see your point. On Fri, Apr 17, 2015 at 1:04 AM, James Molloy <james at jamesmolloy.co.uk> wrote:> Hi Dave, > > You can still bitcast between i32 and float, for example. > > Cheers, > > James > > On Fri, 17 Apr 2015 at 09:03 Dave Pitsbawn <dpitsbawn at gmail.com> wrote: > >> Seems like a new change in LLVM has made it so that bitcast of bitcast >> i8* %1 to %Foo* meaningless? >> >> If I'm correct is there any need for the bitcast anymore? >> _______________________________________________ >> LLVM Developers mailing list >> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu >> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev >> >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150417/c0886587/attachment.html>
On Apr 17, 2015 12:49 AM, "Dave Pitsbawn" <dpitsbawn at gmail.com> wrote:> > Seems like a new change in LLVM has made it so that bitcast of bitcasti8* %1 to %Foo* meaningless?> > If I'm correct is there any need for the bitcast anymore?What particular observations are you referring to that gave you the impression that these were not needed? I'm part-way through migrating LLVM to not depend on the type a pointer points to, with the intent to eventually remove typed pointers in favor of a type less pointer type and remove all pointer to pointer bitcasts, but that work is far from complete.> > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150417/6b6c24ac/attachment.html>