[PATCH] D18234: [WebAssembly] Stackify code emitted by eliminateFrameIndex and SP writeback

[Derek Schuff via llvm-commits]

dschuff created this revision.
dschuff added reviewers: sunfish, jfb.
dschuff added a subscriber: llvm-commits.
Herald added subscribers: dschuff, jfb.

MRI::eliminateFrameIndex can emit several instructions to do address
calculations; these can usually be stackified. Because instructions with
FI operands can have subsequent operands which may be expression trees,
find the top of the leftmost tree and insert the code before it, to keep
the LIFO property.

Also use stackified registers when writing back the SP value to memory
in the epilog; it's unnecessary because SP will not be used after the
epilog, and it results in better code.

http://reviews.llvm.org/D18234

Files:
  lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
  lib/Target/WebAssembly/WebAssemblyRegisterInfo.cpp
  test/CodeGen/WebAssembly/byval.ll
  test/CodeGen/WebAssembly/mem-intrinsics.ll
  test/CodeGen/WebAssembly/userstack.ll

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