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

[Chris Lattner]

Changes in directory llvm/lib/Target/PowerPC:

README.txt updated: 1.39 -> 1.40
---
Log message:

Add another important case we miss


---
Diffs of the changes:  (+19 -0)

 README.txt |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+)


Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.39 llvm/lib/Target/PowerPC/README.txt:1.40
--- llvm/lib/Target/PowerPC/README.txt:1.39	Thu Nov 17 12:26:56 2005
+++ llvm/lib/Target/PowerPC/README.txt	Thu Dec  8 01:13:28 2005
@@ -222,3 +222,22 @@
 instruction to avoid a copy AFTER the 2-addr instruction.  The 2-addr pass
 currently only commutes to avoid inserting a copy BEFORE the two addr instr.
 
+===-------------------------------------------------------------------------===
+
+Compile offsets from allocas:
+
+int *%test() {
+        %X = alloca { int, int }
+        %Y = getelementptr {int,int}* %X, int 0, uint 1
+        ret int* %Y
+}
+
+into a single add, not two:
+
+_test:
+        addi r2, r1, -8
+        addi r3, r2, 4
+        blr
+
+--> important for C++.
+