- Update register allocation hint after coalescing. This is done by the target since the hint is target dependent. This is important for ARM register pair hints.

- Register allocator should resolve the second part of the hint (register number) before passing it to the target since it knows virtual register to physical register mapping.
- More fixes to get ARM load / store double word working.

llvm-svn: 73671

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
index c363ba52b5e..20348055bd9 100644
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -1766,6 +1766,9 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
   // being merged.
   li_->removeInterval(SrcReg);
 
+  // Update regalloc hint.
+  tri_->UpdateRegAllocHint(SrcReg, DstReg, *mf_);
+
   // Manually deleted the live interval copy.
   if (SavedLI) {
     SavedLI->clear();