[llvm-bugs] [Bug 44264] New: m[ft]ppr instruction aliases not implemented
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Dec 10 07:24:06 PST 2019
https://bugs.llvm.org/show_bug.cgi?id=44264
Bug ID: 44264
Summary: m[ft]ppr instruction aliases not implemented
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: PowerPC
Assignee: unassignedbugs at nondot.org
Reporter: colin.samples at gmail.com
CC: llvm-bugs at lists.llvm.org, nemanja.i.ibm at gmail.com
Created attachment 22924
--> https://bugs.llvm.org/attachment.cgi?id=22924&action=edit
patch to implement aliases
The mfppr and mtppr instruction aliases are not implemented in LLVM, but they
are in GCC and xlC. m[ft]ppr32 and quite a number of other m[tf]spr aliases are
also not implemented in LLVM.
I stumbled across this when trying to use the `_mm_pause` function
`clang/lib/Headers/ppc_wrappers/xmmintrin.h`, which uses these instructions in
its implementation.
The attached patch adds the instructions. AFAICT, the PPR was introduced in
POWER6, so this patch checks for that, although it seems like a bit much just
to implement an instruction alias.
Another option would be to just change the implementation in `xmmintrin.h` to
use `mfspr Rx,896`. Thoughts?
--
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20191210/d357939c/attachment.html>
More information about the llvm-bugs
mailing list