tree 1a0e0d478bf67585edbc849ffa7c0dbda8fd98f6
parent bcc80f35660542635f5a17200d20ad6c4367dd29
author whitequark <whitequark@whitequark.org> 1549989710 +0000
committer whitequark <whitequark@whitequark.org> 1549989710 +0000

[SelectionDAG] Fix return calling convention in expansion of ?MULO

Summary:
The SMULO/UMULO DAG nodes, when not directly supported by the target,
expand to a multiplication twice as wide. In case that the resulting
type is not legal, the legalizer cannot directly call the intrinsic
with the wide arguments; instead, it "pre-lowers" them by splitting
them in halves.

rL283203 made sure that on big endian targets, the legalizer passes
the argument halves in the correct order. It did not do the same
for the return value halves because the existing code used a hack;
it put an illegal type into DAG and hoped that nothing would break
and it would be correctly lowered elsewhere.

rL307207 fixed this, handling return value halves similar to how
argument handles are handled, but did not take big-endian targets
into account.

This commit fixes the expansion on big-endian targets, such as
the out-of-tree OR1K target.

Reviewers: eli.friedman, vadimcn

Subscribers: george-hopkins, efriedma, llvm-commits

Differential Revision: https://reviews.llvm.org/D45355

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353854 91177308-0d34-0410-b5e6-96231b3b80d8