Introduce explicit ExtractFromEnd recipes to extract the final values
for live-outs instead of implicitly extracting in VPLiveOut::fixPhi.
This is a follow-up to the recent changes of modeling extracts for
recurrences and consolidates live-out extract creation for fixed-order
recurrences at a single place: addLiveOutsForFirstOrderRecurrences.
It is also in preparation of replacing VPLiveOut with VPIRInstructions
wrapping the original scalar phis.
PR: https://github.com/llvm/llvm-project/pull/100658
This change allows to consider compare instructions in the loop with
multiple use inside the loop and outside.
This change allows to vectorise this loop:
int foo(float* a, int n) {
_Bool any = 0;
_Bool all = 1;
for (int i = 0; i < n; i++) {
if (a[i] < 0.0f) {
any = 1;
} else {
all = 0;
}
}
return all ? 1 : any ? 2 : 3;
}
