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| author | Evan Cheng <evan.cheng@apple.com> | 2009-09-28 09:14:39 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-09-28 09:14:39 +0000 |
| commit | 5adb66a646e2ec32265263739f5b01c3f50c176a (patch) | |
| tree | 38b5fb6a9d2665466cd3b88031122d9c95de6110 /lib/Target/ARM/README.txt | |
| parent | 705428ae4a7fa6d97a95f7811fa2e36630a43c9c (diff) | |
| download | llvm-5adb66a646e2ec32265263739f5b01c3f50c176a.tar.gz llvm-5adb66a646e2ec32265263739f5b01c3f50c176a.tar.bz2 llvm-5adb66a646e2ec32265263739f5b01c3f50c176a.tar.xz | |
Make ARM and Thumb2 32-bit immediate materialization into a single 32-bit pseudo
instruction. This makes it re-materializable.
Thumb2 will split it back out into two instructions so IT pass will generate the
right mask. Also, this expose opportunies to optimize the movw to a 16-bit move.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82982 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/README.txt')
| -rw-r--r-- | lib/Target/ARM/README.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index 08435c57eb..8fb1da3008 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -592,3 +592,11 @@ conditional move: it saves an instruction and a register. //===---------------------------------------------------------------------===// + +add/sub/and/or + i32 imm can be simplified by folding part of the immediate +into the operation. + +//===---------------------------------------------------------------------===// + +It might be profitable to cse MOVi16 if there are lots of 32-bit immediates +with the same bottom half. |