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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 | c8f595212ffcb3e6d599e6a51e3065c0572191b9 (patch) | |
| tree | f7c39bca4f0a79640422a300ea25c78c74f26882 /llvm/lib/Target | |
| parent | 3b10dd1bec4b0761ade4f0baf28b8b2b2c0e1d7d (diff) | |
| download | bcm5719-llvm-c8f595212ffcb3e6d599e6a51e3065c0572191b9.tar.gz bcm5719-llvm-c8f595212ffcb3e6d599e6a51e3065c0572191b9.zip | |
Minor amendment to switch-lowering improvement.
llvm-svn: 107569
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/README.txt | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt index 8f785393fd0..90afe3640ce 100644 --- a/llvm/lib/Target/README.txt +++ b/llvm/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 + //===---------------------------------------------------------------------===// |
