tree 83c244611e8c59c5e1cfba3956a94e64cb4b6e90
parent 4b7bad9eaea2233521a94f6b096aaa88dc584e23
author Yuanfang Chen <yuanfang.chen@sony.com> 1617261043 -0700
committer Yuanfang Chen <yuanfang.chen@sony.com> 1618245143 -0700

[InstCombine] when calling conventions are compatible, don't convert the call to undef idiom

D24453 enabled libcalls simplication for ARM PCS. This may cause
caller/callee calling conventions mismatch in some situations such as
LTO. This patch makes instcombine aware that the compatible calling
conventions differences are benign (not emitting undef idom).

Differential Revision: https://reviews.llvm.org/D99773