tree 318fca52f887aa811c2ef09a8f6d2e9899d25387
parent 45f61bfec3f768594e9bbf08fb423ea34f7d5fc1
author John Brawn <john.brawn@arm.com> 1426872007 +0000
committer John Brawn <john.brawn@arm.com> 1426872007 +0000

[ARM] Fix handling of thumb1 out-of-range frame offsets

LocalStackSlotPass assumes that isFrameOffsetLegal doesn't change its
answer when the base register changes. Unfortunately this isn't true
in thumb1, where SP-based loads allow a larger offset than
non-SP-based loads, and this causes the base register reuse code to
generate instructions that are unencodable, causing an assertion
failure. 

Solve this by adding a BaseReg parameter to isFrameOffsetLegal, which
ARMBaseRegisterInfo can then make use of to give the correct answer. 

Differential Revision: http://reviews.llvm.org/D8419


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232825 91177308-0d34-0410-b5e6-96231b3b80d8