diff options
| -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. + +//===---------------------------------------------------------------------===// + |