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| author | Chris Lattner <sabre@nondot.org> | 2007-04-20 20:18:43 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-04-20 20:18:43 +0000 |
| commit | 93305bc4620c12042b11a5e721feda7892d2f65d (patch) | |
| tree | 7dcab32cda17b60507d5bb53868c18ab89e7fcb6 /lib | |
| parent | 58d7fbf250659246fcca9417a91170a681b1850a (diff) | |
| download | llvm-93305bc4620c12042b11a5e721feda7892d2f65d.tar.gz llvm-93305bc4620c12042b11a5e721feda7892d2f65d.tar.bz2 llvm-93305bc4620c12042b11a5e721feda7892d2f65d.tar.xz | |
add a crazy idea
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36273 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/ARM/README.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index 417f4a30c3..a75007cd4f 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -17,6 +17,18 @@ Reimplement 'select' in terms of 'SEL'. //===---------------------------------------------------------------------===// +Crazy idea: Consider code that uses lots of 8-bit or 16-bit values. By the +time regalloc happens, these values are now in a 32-bit register, usually with +the top-bits known to be sign or zero extended. If spilled, we should be able +to spill these to a 8-bit or 16-bit stack slot, zero or sign extending as part +of the reload. + +Doing this reduces the size of the stack frame (important for thumb etc), and +also increases the likelihood that we will be able to reload multiple values +from the stack with a single load. + +//===---------------------------------------------------------------------===// + The constant island pass is in good shape. Some cleanups might be desirable, but there is unlikely to be much improvement in the generated code. |