| commit | 67bf8e2b3944b74e0a0c483c54b12f2c02a4b758 | |
| author | Evan Cheng <evan.cheng@apple.com> | |
| Fri, 8 May 2009 06:34:09 +0000 (8 06:34 +0000) | ||
| committer | Evan Cheng <evan.cheng@apple.com> | |
| Fri, 8 May 2009 06:34:09 +0000 (8 06:34 +0000) | ||
| tree | c3a66d59799b3626327d15ebc0391fc49f1dfe1f | treesnapshot (tar.gz zip) |
| parent | 9fb109a1a060895f0e6be87eb73c98bf387ba84d | commitdiff |
Optimize code placement in loop to eliminate unconditional branches or move unconditional branch to the outside of the loop. e.g.
/// A:
/// ...
/// <fallthrough to B>
///
/// B: --> loop header
/// ...
/// jcc <cond> C, [exit]
///
/// C:
/// ...
/// jmp B
///
/// ==>
///
/// A:
/// ...
/// jmp B
///
/// C: --> new loop header
/// ...
/// <fallthough to B>
///
/// B:
/// ...
/// jcc <cond> C, [exit]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71209 91177308-0d34-0410-b5e6-96231b3b80d8
/// A:
/// ...
/// <fallthrough to B>
///
/// B: --> loop header
/// ...
/// jcc <cond> C, [exit]
///
/// C:
/// ...
/// jmp B
///
/// ==>
///
/// A:
/// ...
/// jmp B
///
/// C: --> new loop header
/// ...
/// <fallthough to B>
///
/// B:
/// ...
/// jcc <cond> C, [exit]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71209 91177308-0d34-0410-b5e6-96231b3b80d8
| lib/CodeGen/CodePlacementOpt.cpp | diffblobblamehistory | |
| lib/Target/X86/X86InstrInfo.cpp | diffblobblamehistory | |
| test/CodeGen/X86/code_placement.ll | [new file with mode: 0644] | blob |