Displaying 2 results from an estimated 2 matches for "fubqib".
2017 Mar 08
2
Vector trunc code generation difference between llvm-3.9 and 4.0
...hange was intentional or
if that was a side effect that can be limited.
On Sat, Feb 18, 2017 at 9:11 AM, Sanjay Patel <spatel at rotateright.com>
wrote:
> Yes, there is an IR difference between clang 3.9.1 and clang trunk before
> any IR transforms are done:
> https://godbolt.org/g/FuBqIb
>
> We can't solve this problem (moving a trunc ahead of other vector ops) in
> general in IR because we take a conservative approach to vector transforms
> in IR. That means the burden for solving the general problem falls on the
> front-end or the back-end. If you can bisect to...
2017 Feb 18
2
Vector trunc code generation difference between llvm-3.9 and 4.0
Thanks Sanjay. Interestingly for me, disable-llvm-optmzns did not make a
difference in the way the shift was handled. Does the initial IR generated
for you show this difference when the option is passed?
Best regards
Saurabh
On 17 February 2017 at 19:03, Sanjay Patel <spatel at rotateright.com> wrote:
> I think this is caused by a front-end change (cc'ing clang-dev) because
>