diff options
author | Jim Grosbach <grosbach@apple.com> | 2013-08-16 23:37:31 +0000 |
---|---|---|
committer | Jim Grosbach <grosbach@apple.com> | 2013-08-16 23:37:31 +0000 |
commit | b49860ef030cb2dba0386278ee8737eecc4e7272 (patch) | |
tree | 49e12e5f8665c077022e4848d94bc262cceb0ef8 /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | |
parent | 0673379712100110c213a0e7610b73b6c706e83d (diff) | |
download | llvm-b49860ef030cb2dba0386278ee8737eecc4e7272.tar.gz llvm-b49860ef030cb2dba0386278ee8737eecc4e7272.tar.bz2 llvm-b49860ef030cb2dba0386278ee8737eecc4e7272.tar.xz |
ARM: Fix more fast-isel verifier failures.
Teach the generic instruction selection helper functions to constrain
the register classes of their input operands. For non-physical register
references, the generic code needs to be careful not to mess that up
when replacing references to result registers. As the comment indicates
for MachineRegisterInfo::replaceRegWith(), it's important to call
constrainRegClass() first.
rdar://12594152
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188593 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index e60adbf9e4..17ccdb2bd5 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -497,6 +497,10 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { if (J == E) break; To = J->second; } + // Make sure the new register has a sufficiently constrained register class. + if (TargetRegisterInfo::isVirtualRegister(From) && + TargetRegisterInfo::isVirtualRegister(To)) + MRI.constrainRegClass(To, MRI.getRegClass(From)); // Replace it. MRI.replaceRegWith(From, To); } |