[PATCH] D42509: [LivePhysRegs] Preserve pristine registers in blocks with no successors.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Without this patch, LLVM trunk generates the following code:

  no_stm:
          .fnstart
  @ %bb.0:                                @ %entry
          .save   {r7, lr}
          push    {r7, lr}
          .setfp  r7, sp
          add     r7, sp, #0
          mov     r4, r3
          adds    r4, #8
          stm     r4!, {r0, r1, r2}
          bl      throws_2

How do you expect the unwinder to restore r4 after we've overwritten it?


Repository:
  rL LLVM

https://reviews.llvm.org/D42509