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, 9 insertions, 0 deletions

diff --git a/llvm/test/Transforms/FunctionAttrs/2008-09-13-VolatileRead.ll b/llvm/test/Transforms/FunctionAttrs/2008-09-13-VolatileRead.ll
new file mode 100644
index 00000000000..b6077fd8ee3
--- /dev/null
+++ b/llvm/test/Transforms/FunctionAttrs/2008-09-13-VolatileRead.ll
@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | opt -functionattrs | llvm-dis | not grep read
+; PR2792
+
+@g = global i32 0		; <i32*> [#uses=1]
+
+define i32 @f() {
+	%t = volatile load i32* @g		; <i32> [#uses=1]
+	ret i32 %t
+}