[llvm-commits] CVS: llvm/lib/Target/X86/README.txt

[Chris Lattner]

Changes in directory llvm/lib/Target/X86:

README.txt updated: 1.64 -> 1.65
---
Log message:

a couple of miscellaneous things.


---
Diffs of the changes:  (+18 -0)

 README.txt |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+)


Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.64 llvm/lib/Target/X86/README.txt:1.65
--- llvm/lib/Target/X86/README.txt:1.64	Sat Mar  4 19:15:18 2006
+++ llvm/lib/Target/X86/README.txt	Wed Mar  8 19:39:46 2006
@@ -566,3 +566,21 @@
         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.
+
+//===---------------------------------------------------------------------===//
+