Luke Lau
6f9c68d320
[VPlan] Don't adjust trip count for DataAndControlFlowWithoutRuntimeCheck ( #183729 ) ...
Previously, the canonical IV increment may have overflowed to a non-zero
value due to vscale being a non power-of-two. So we used to emit a
runtime check for this.
If you didn't want the runtime check,
DataAndControlFlowWithoutRuntimeCheck skipped it and instead tweaked the
trip count so it wouldn't overflow.
However #144963 stopped the check from ever being emitted because vscale
is always a power-of-two on AArch64 and RISC-V, so it never overflowed
to a non-zero value. And in #183292 the code to emit the check was
removed. But we never restored the trip count back to normal when the
target's vscale was a power-of-two.
Now that vscale is always a power-of-two, this PR avoids adjusting it. A
follow up NFC can then remove DataAndControlFlowWithoutRuntimeCheck.
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