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| author | Dan Gohman <gohman@apple.com> | 2008-09-24 23:44:12 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-09-24 23:44:12 +0000 |
| commit | 382e2ec6b7acc68229d9ca666aefc42c46eeaa4c (patch) | |
| tree | e37913150c7eacbfa8acadc6717b1acb6894b860 | |
| parent | f17c232a9eff4b2c3b2de9834db93a101d46621b (diff) | |
| download | bcm5719-llvm-382e2ec6b7acc68229d9ca666aefc42c46eeaa4c.tar.gz bcm5719-llvm-382e2ec6b7acc68229d9ca666aefc42c46eeaa4c.zip | |
Give LowerSubregs.cpp a top-level description.
llvm-svn: 56596
| -rw-r--r-- | llvm/lib/CodeGen/LowerSubregs.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/LowerSubregs.cpp b/llvm/lib/CodeGen/LowerSubregs.cpp index 00038d5c1c7..f9cef4ccfb7 100644 --- a/llvm/lib/CodeGen/LowerSubregs.cpp +++ b/llvm/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" |
