rewrite OptimizeGlobalAddressOfMalloc to fix PR6422, some bugs

introduced when mallocinst was eliminated. 

llvm-svn: 97178

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/test/Transforms/GlobalOpt/2010-02-25-MallocPromote.ll b/llvm/test/Transforms/GlobalOpt/2010-02-25-MallocPromote.ll
new file mode 100644
index 00000000000..52f4fde3bb7
--- /dev/null
+++ b/llvm/test/Transforms/GlobalOpt/2010-02-25-MallocPromote.ll
@@ -0,0 +1,17 @@
+; PR6422
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@fixLRBT = internal global i32* null              ; <i32**> [#uses=2]
+
+declare noalias i8* @malloc(i32)
+
+define i32 @parser() nounwind {
+bb918:
+  %malloccall.i10 = call i8* @malloc(i32 16) nounwind ; <i8*> [#uses=1]
+  %0 = bitcast i8* %malloccall.i10 to i32*        ; <i32*> [#uses=1]
+  store i32* %0, i32** @fixLRBT, align 8
+  %1 = load i32** @fixLRBT, align 8               ; <i32*> [#uses=0]
+  %A = load i32* %1
+  ret i32 %A
+}