[all-commits] [llvm/llvm-project] ce1eb7: [WebAssembly] Fixed 64-bit indices in br_table

[Wouter van Oortmerssen via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ce1eb7af9dc1fb1c4167fa21824bda7dcf92bbce
      https://github.com/llvm/llvm-project/commit/ce1eb7af9dc1fb1c4167fa21824bda7dcf92bbce
  Author: Wouter van Oortmerssen <aardappel at gmail.com>
  Date:   2020-07-30 (Thu, 30 Jul 2020)

  Changed paths:
    M llvm/lib/Target/WebAssembly/WebAssemblyFixBrTableDefaults.cpp
    M llvm/test/CodeGen/WebAssembly/switch.ll

  Log Message:
  -----------
  [WebAssembly] Fixed 64-bit indices in br_table

LLVM selection dag assumes "switch" indices are pointer sized, which causes problems for our 32-bit br_table. The new function ensures 32-bit operands don't get unnecessarily extended, and 64-bit operands get truncated.

Note that the changes to the existing test test exactly that: the addition of -NEXT in 2 places ensures no extension is inserted (which the test previously ignored) and that the wrap is present (previously omitted in wasm64 mode).

Differential Revision: https://reviews.llvm.org/D84705