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

[Chris Lattner]

Changes in directory llvm/lib/Target:

README.txt updated: 1.5 -> 1.6
---
Log message:

new test


---
Diffs of the changes:  (+12 -0)

 README.txt |   12 ++++++++++++
 1 files changed, 12 insertions(+)


Index: llvm/lib/Target/README.txt
diff -u llvm/lib/Target/README.txt:1.5 llvm/lib/Target/README.txt:1.6
--- llvm/lib/Target/README.txt:1.5	Sun Feb  5 02:26:16 2006
+++ llvm/lib/Target/README.txt	Wed Feb 15 13:52:06 2006
@@ -64,3 +64,15 @@
 
 //===---------------------------------------------------------------------===//
 
+DAG combine this into mul A, 8:
+
+int %test(int %A) {
+  %B = mul int %A, 8  ;; shift
+  %C = add int %B, 7  ;; dead, no demanded bits.
+  %D = and int %C, -8 ;; dead once add is gone.
+  ret int %D
+}
+
+This sort of thing occurs in the alloca lowering code and other places that
+are generating alignment of an already aligned value.
+