[all-commits] [llvm/llvm-project] 1c8371: Revert "[CostModel] remove cost-kind predicate for...

[Martin Storsjö via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 1c8371692dfe8245bc6690ff1262dcced4649d21
      https://github.com/llvm/llvm-project/commit/1c8371692dfe8245bc6690ff1262dcced4649d21
  Author: Martin Storsjö <martin at martin.st>
  Date:   2020-10-25 (Sun, 25 Oct 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/BasicTTIImpl.h
    M llvm/test/Analysis/CostModel/ARM/intrinsic-cost-kinds.ll
    M llvm/test/Analysis/CostModel/ARM/reduce-add.ll
    M llvm/test/Analysis/CostModel/X86/intrinsic-cost-kinds.ll

  Log Message:
  -----------
  Revert "[CostModel] remove cost-kind predicate for vector reduction costs"

This reverts commit 22d10b8ab44f703b72b8316a9b3b8adc623ca73f.

This broke compilation e.g. like this:
$ cat synth.c
*a;
float *b;
c() {
  for (;;) {
    float d = -*b * *a++;
    d -= *--b * *a++;
    d -= *--b * *a;
    d -= *--b * *a;
    e(d);
  }
}
$ clang -target x86_64-linux-gnu -c -O2 -ffast-math synth.c
clang: ../include/llvm/Support/Casting.h:104: static bool llvm::isa_impl
_cl<To, const From*>::doit(const From*) [with To = llvm::PointerType; Fr
om = llvm::Type]: Assertion `Val && "isa<> used on a null pointer"' fail
ed.