diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2006-05-30 06:23:50 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2006-05-30 06:23:50 +0000 |
| commit | 8c65fa564acee3d1ca81e932f05433b382443b22 (patch) | |
| tree | b47dcb4426e8704c6e71a842ec8f9c60b79f88ad /lib | |
| parent | 66c873479fc3c3a56de9b44cb315de144d09e4be (diff) | |
| download | llvm-8c65fa564acee3d1ca81e932f05433b382443b22.tar.gz llvm-8c65fa564acee3d1ca81e932f05433b382443b22.tar.bz2 llvm-8c65fa564acee3d1ca81e932f05433b382443b22.tar.xz | |
Some new entries about truncate / anyext
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28548 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/README.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index e4a9b55c45..d944cbf103 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -606,3 +606,19 @@ _bar: The current isel scheme will not allow the load to be folded in the call since the load's chain result is read by the callseq_start. + +//===---------------------------------------------------------------------===// + +Don't forget to find a way to squash noop truncates in the JIT environment. + +//===---------------------------------------------------------------------===// + +Implement anyext in the same manner as truncate that would allow them to be +eliminated. + +//===---------------------------------------------------------------------===// + +How about implementing truncate / anyext as a property of machine instruction +operand? i.e. Print as 32-bit super-class register / 16-bit sub-class register. +Do this for the cases where a truncate / anyext is guaranteed to be eliminated. +For IA32 that is truncate from 32 to 16 and anyext from 16 to 32. |