Rename AddReadAttrs to FunctionAttrs, and teach it how

to work out (in a very simplistic way) which function
arguments (pointer arguments only) are only dereferenced
and so do not escape.  Mark such arguments 'nocapture'.

llvm-svn: 61525

1 files changed, 18 insertions, 0 deletions

diff --git a/llvm/test/Transforms/FunctionAttrs/2008-09-03-ReadNone.ll b/llvm/test/Transforms/FunctionAttrs/2008-09-03-ReadNone.ll
new file mode 100644
index 00000000000..a17d381eec8
--- /dev/null
+++ b/llvm/test/Transforms/FunctionAttrs/2008-09-03-ReadNone.ll
@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | opt -functionattrs | llvm-dis | grep readnone | count 4
+@x = global i32 0
+
+declare i32 @e() readnone
+
+define i32 @f() {
+	%tmp = call i32 @e( )		; <i32> [#uses=1]
+	ret i32 %tmp
+}
+
+define i32 @g() readonly {
+	ret i32 0
+}
+
+define i32 @h() readnone {
+	%tmp = load i32* @x		; <i32> [#uses=1]
+	ret i32 %tmp
+}