[all-commits] [llvm/llvm-project] 245ec6: Revert "[LV] Re-use existing broadcast value for l...

[Martin Storsjö via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 245ec675a4e41f7ec24dfc998720bffdc46a6c53
      https://github.com/llvm/llvm-project/commit/245ec675a4e41f7ec24dfc998720bffdc46a6c53
  Author: Martin Storsjö <martin at martin.st>
  Date:   2023-07-25 (Tue, 25 Jul 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/interleaving-load-store.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/intrinsiccost.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding-unroll.ll
    M llvm/test/Transforms/LoopVectorize/ARM/pointer_iv.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/divrem.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/illegal-type.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/uniform-load-store.ll
    M llvm/test/Transforms/LoopVectorize/X86/epilog-vectorization-inductions.ll
    M llvm/test/Transforms/LoopVectorize/X86/intrinsiccost.ll
    M llvm/test/Transforms/LoopVectorize/X86/load-deref-pred.ll
    M llvm/test/Transforms/LoopVectorize/X86/pr54634.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll
    M llvm/test/Transforms/LoopVectorize/float-induction.ll
    M llvm/test/Transforms/LoopVectorize/induction.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop-uf4.ll
    M llvm/test/Transforms/LoopVectorize/scalable-first-order-recurrence.ll
    M llvm/test/Transforms/PhaseOrdering/AArch64/hoisting-sinking-required-for-vectorization.ll
    M llvm/test/Transforms/PhaseOrdering/X86/vdiv.ll

  Log Message:
  -----------
  Revert "[LV] Re-use existing broadcast value for live-ins."

This reverts commit eea9258648ce73507f6f85c395de978af659d498.

That commit triggered crashes in the following testcase:

$ cat reduced.c
typedef struct {
  int a[8]
} b;
typedef struct {
  b *c;
  short d
} e;
void f() {
  int g;
  char *h;
  e *i = f;
  short j = i->d;
  int a = i->c->a[0];
  for (;;)
    for (; g < a; g++) {
      *h = j * i->d >> 8;
      h++;
    }
}
$ clang -target aarch64-linux-gnu -w -c -O2 reduced.c