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-rw-r--r--lib/Target/README.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 24fb24d386..807768002b 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -239,3 +239,15 @@ ulong %bar() {
it should be extended to do so.
//===---------------------------------------------------------------------===//
+
+Turn this into a single byte store with no load (the other 3 bytes are
+unmodified):
+
+void %test(uint* %P) {
+ %tmp = load uint* %P
+ %tmp14 = or uint %tmp, 3305111552
+ %tmp15 = and uint %tmp14, 3321888767
+ store uint %tmp15, uint* %P
+ ret void
+}
+