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| author | Eli Friedman <eli.friedman@gmail.com> | 2010-07-03 08:43:32 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2010-07-03 08:43:32 +0000 |
| commit | b482829abb6d3e1fe80eec0ad92e0514e41cfd2a (patch) | |
| tree | d86acaf974096f45ebdb6245c75658fc3554c6ec /lib/Target/README.txt | |
| parent | b4a74c1d820bd913e91e4c921a141824f6bfe2df (diff) | |
| download | llvm-b482829abb6d3e1fe80eec0ad92e0514e41cfd2a.tar.gz llvm-b482829abb6d3e1fe80eec0ad92e0514e41cfd2a.tar.bz2 llvm-b482829abb6d3e1fe80eec0ad92e0514e41cfd2a.tar.xz | |
Minor amendment to switch-lowering improvement.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107569 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 8f785393fd..90afe3640c 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -1918,9 +1918,17 @@ a: .LBB0_2: ret .LBB0_3: - xorb %al, %al - jmp foo@PLT # TAILCALL + jmp foo # TAILCALL The movl+movl+btq+jb could be simplified to a cmpl+jne. +Or, if we wanted to be really clever, we could simplify the whole thing to +something like the following, which eliminates a branch: + xorl $1, %edi + cmpl $4, %edi + ja .LBB0_2 + ret +.LBB0_2: + jmp foo # TAILCALL + //===---------------------------------------------------------------------===// |