https://bugs.llvm.org/show_bug.cgi?id=16726
Sanjay Patel <spatel+l...@rotateright.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
CC| |spatel+l...@rotateright.com
Status|REOPENED |RESOLVED
--- Comment #5 from Sanjay Patel <spatel+l...@rotateright.com> ---
After https://reviews.llvm.org/rL310509 (an IR solution):
$ ./clang -O2 16726.c -S -o - |grep ro | grep \%
rolb %cl, %dil
rorb %cl, %dil
rolw %cl, %di
rorw %cl, %di
roll %cl, %edi
rorl %cl, %edi
rolq %cl, %rdi
rorq %cl, %rdi
Note:
1. I don't think the code examples as written in C are safe - if the shift
amount exceeds the type width or is 0, then you have UB.
2. We're still producing 'and' to mask the rotation amount which seems
unnecessary based on the gcc code. There's more discussion about that in the
newer bug 34046, so I'm going to resolve this one (feel free to reopen if you
disagree) and leave that one open.
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