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: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
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?
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