https://llvm.org/bugs/show_bug.cgi?id=31914
Bug ID: 31914
Summary: CopyFromReg with a use removed with
-jump-is-expensive=false
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: unassignedb...@nondot.org
Reporter: nemanja.i....@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17956
--> https://llvm.org/bugs/attachment.cgi?id=17956&action=edit
Test case to reproduce the failure
Compiling the attached test case with -jump-is-expensive=false
-verify-machineinstrs illustrates the problem. Without -verify-machineinstrs,
it's a segfault in MachineCSE because the pass will get a definition of a vreg
from MachineRegisterInfo and dereference the returned null pointer.
This failure appears as of revision 292944 (https://reviews.llvm.org/rL292944).
To reproduce:
llc -verify-machineinstrs -jump-is-expensive=false
-mtriple=powerpc64le-unknown-unknown -mcpu=pwr8 crashWithCheapBranches.ll
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