diff options
Diffstat (limited to 'llvm/lib/CodeGen/VirtRegMap.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/VirtRegMap.cpp | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp index 0d17d43d972..3d72d204ac4 100644 --- a/llvm/lib/CodeGen/VirtRegMap.cpp +++ b/llvm/lib/CodeGen/VirtRegMap.cpp @@ -266,6 +266,7 @@ void VirtRegRewriter::addMBBLiveIns() { } void VirtRegRewriter::rewrite() { + bool NoSubRegLiveness = !MRI->tracksSubRegLiveness(); SmallVector<unsigned, 8> SuperDeads; SmallVector<unsigned, 8> SuperDefs; SmallVector<unsigned, 8> SuperKills; @@ -347,7 +348,8 @@ void VirtRegRewriter::rewrite() { // A virtual register kill refers to the whole register, so we may // have to add <imp-use,kill> operands for the super-register. A // partial redef always kills and redefines the super-register. - if (MO.readsReg() && (MO.isDef() || MO.isKill())) + if (NoSubRegLiveness && MO.readsReg() + && (MO.isDef() || MO.isKill())) SuperKills.push_back(PhysReg); if (MO.isDef()) { @@ -358,10 +360,12 @@ void VirtRegRewriter::rewrite() { MO.setIsUndef(false); // Also add implicit defs for the super-register. - if (MO.isDead()) - SuperDeads.push_back(PhysReg); - else - SuperDefs.push_back(PhysReg); + if (NoSubRegLiveness) { + if (MO.isDead()) + SuperDeads.push_back(PhysReg); + else + SuperDefs.push_back(PhysReg); + } } // PhysReg operands cannot have subregister indexes. |
