https://bugs.llvm.org/show_bug.cgi?id=47811
Bug ID: 47811
Summary: LR not correctly saved for inline assembly clobbering
LR
Product: libraries
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: unassignedb...@nondot.org
Reporter: programmerj...@gmail.com
CC: llvm-bugs@lists.llvm.org, nemanja.i....@gmail.com
The following IR is miscompiled:
https://gcc.godbolt.org/z/s6c6vT
target triple = "powerpc64le-unknown-linux-gnu"
define void @f() {
call void asm sideeffect "mtlr 31", "~{lr}"()
ret void
}
Generated Assembly (trimmed to just f()):
f: # @f
.Lfunc_begin0:
.cfi_startproc
# %bb.0:
#APP
mtlr 31
#NO_APP
blr
This causes f to return to whatever address was in r31 instead of to the
caller. I expect LLVM to instead store the return address that was in LR to
another register or to the stack and restore it before returning.
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