diff options
Diffstat (limited to 'lib/CodeGen/LowerSubregs.cpp')
| -rw-r--r-- | lib/CodeGen/LowerSubregs.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp index 00038d5c1c..f9cef4ccfb 100644 --- a/lib/CodeGen/LowerSubregs.cpp +++ b/lib/CodeGen/LowerSubregs.cpp @@ -6,6 +6,13 @@ // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// +// +// This file defines a MachineFunction pass which runs after register +// allocation that turns subreg insert/extract instructions into register +// copies, as needed. This ensures correct codegen even if the coalescer +// isn't able to remove all subreg instructions. +// +//===----------------------------------------------------------------------===// #define DEBUG_TYPE "lowersubregs" #include "llvm/CodeGen/Passes.h" |