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

[Chris Lattner]

Changes in directory llvm/lib/Target/PowerPC:

README.txt updated: 1.75 -> 1.76
---
Log message:

Add a note about the MUL -> FMADD vector bug.


---
Diffs of the changes:  (+10 -0)

 README.txt |   10 ++++++++++
 1 files changed, 10 insertions(+)


Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.75 llvm/lib/Target/PowerPC/README.txt:1.76
--- llvm/lib/Target/PowerPC/README.txt:1.75	Sat Mar 18 23:33:30 2006
+++ llvm/lib/Target/PowerPC/README.txt	Sun Mar 19 16:08:08 2006
@@ -536,3 +536,13 @@
   bar (x);
 }
 
+===-------------------------------------------------------------------------===
+
+Altivec: Codegen'ing MUL with vector FMADD should add -0.0, not 0.0:
+http://gcc.gnu.org/bugzilla/show_bug.cgi?id=8763
+
+We need to codegen -0.0 vector efficiently (no constant pool load).
+
+When -ffast-math is on, we can use 0.0.
+
+===-------------------------------------------------------------------------===