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

[Chris Lattner]

Changes in directory llvm/lib/Target/PowerPC:

README.txt updated: 1.48 -> 1.49
---
Log message:

add the 'lucas' optimization


---
Diffs of the changes:  (+25 -0)

 README.txt |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+)


Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.48 llvm/lib/Target/PowerPC/README.txt:1.49
--- llvm/lib/Target/PowerPC/README.txt:1.48	Fri Jan 27 23:40:47 2006
+++ llvm/lib/Target/PowerPC/README.txt	Mon Jan 30 20:55:28 2006
@@ -402,3 +402,28 @@
 TargetConstantVec's if it's one of the many forms that are algorithmically
 computable using the spiffy altivec instructions.
 
+===-------------------------------------------------------------------------===
+
+Compile this:
+
+double %test(double %X) {
+        %Y = cast double %X to long
+        %Z = cast long %Y to double
+        ret double %Z
+}
+
+to this:
+
+_test:
+        fctidz f0, f1
+        stfd f0, -8(r1)
+        lwz r2, -4(r1)
+        lwz r3, -8(r1)
+        stw r2, -12(r1)
+        stw r3, -16(r1)
+        lfd f0, -16(r1)
+        fcfid f1, f0
+        blr
+
+without the lwz/stw's.
+