[regalloc] Make RegMask clobbers prevent merging vreg's into PhysRegs when hoisting def's upwards.
Summary:
This prevents vreg260 and D7 from being merged in:
%vreg260<def> = LDC1 ...
JAL <ga:@sin>, <regmask ... list not containing D7 ...>
%D7<def> = COPY %vreg260; ...
Doing so is not valid because the JAL clobbers the D7.
This fixes the almabench regression in the LLVM 3.7.0 release branch.
Reviewers: MatzeB
Subscribers: MatzeB, qcolombet, hans, llvm-commits
Differential Revision: http://reviews.llvm.org/D11649
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243745 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed