Files
clang-p2996/llvm/test/CodeGen/PowerPC
Sanjay Patel 8aac22e06a [SelectionDAG] fix bug in translating funnel shift with non-power-of-2 type
The bug is visible in the constant-folded x86 tests. We can't use the
negated shift amount when the type is not power-of-2:
https://rise4fun.com/Alive/US1r

...so in that case, use the regular lowering that includes a select
to guard against a shift-by-bitwidth. This path is improved by only
calculating the modulo shift amount once now.

Also, improve the rotate (with power-of-2 size) lowering to use
a negate rather than subtract from bitwidth. This improves the
codegen whether we have a rotate instruction or not (although
we can still see that we're not matching to a legal rotate in
all cases).

llvm-svn: 338592
2018-08-01 17:17:08 +00:00
..
2017-11-06 19:09:38 +00:00
2017-10-10 08:46:10 +00:00