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| author | Chris Lattner <sabre@nondot.org> | 2006-03-09 01:39:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-03-09 01:39:46 +0000 |
| commit | 181b9c6a2af1d9df7f302fa8a0ebe5421c39af4e (patch) | |
| tree | 9b152c0c8b67b50ff2dd72c974ae913b318cf7a7 /lib | |
| parent | 5a7a9e53861188ad84cb0e08e34562da744a907a (diff) | |
| download | llvm-181b9c6a2af1d9df7f302fa8a0ebe5421c39af4e.tar.gz llvm-181b9c6a2af1d9df7f302fa8a0ebe5421c39af4e.tar.bz2 llvm-181b9c6a2af1d9df7f302fa8a0ebe5421c39af4e.tar.xz | |
a couple of miscellaneous things.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26625 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/README.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 3e2eaef3e5..651d472902 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -566,3 +566,21 @@ LBB_foo_3: # no_exit jb LBB_foo_3 # no_exit //===---------------------------------------------------------------------===// + +Codegen: + if (copysign(1.0, x) == copysign(1.0, y)) +into: + if (x^y & mask) +when using SSE. + +//===---------------------------------------------------------------------===// + +Optimize this into something reasonable: + x * copysign(1.0, y) * copysign(1.0, z) + +//===---------------------------------------------------------------------===// + +Optimize copysign(x, *y) to use an integer load from y. + +//===---------------------------------------------------------------------===// + |