Add a testcase for eliminating memcpy's at the end of functions. Forgot to commit...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46497 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/DeadStoreElimination/memcpy.ll b/test/Transforms/DeadStoreElimination/memcpy.ll
new file mode 100644 (file)
index 0000000..550f764
--- /dev/null
+++ b/test/Transforms/DeadStoreElimination/memcpy.ll
@@ -0,0 +1,52 @@
+; RUN: llvm-as < %s | opt -dse | llvm-dis | not grep tmp180
+; ModuleID = 'placeholder.adb'
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
+target triple = "i686-pc-linux-gnu"
+       %struct.placeholder__T5b = type { i32, [1 x i32] }
+       %struct.placeholder__an_interval___PAD = type { %struct.placeholder__interval, [4 x i32] }
+       %struct.placeholder__interval = type { i32, i32 }
+       %struct.placeholder__s__s__the_interval___PAD = type { %struct.placeholder__interval }
+
+define void @_ada_placeholder() nounwind  {
+entry:
+       %an_interval = alloca %struct.placeholder__an_interval___PAD            ; <%struct.placeholder__an_interval___PAD*> [#uses=3]
+       %tmp34 = bitcast %struct.placeholder__an_interval___PAD* %an_interval to %struct.placeholder__T5b*              ; <%struct.placeholder__T5b*> [#uses=1]
+       %tmp5 = getelementptr %struct.placeholder__an_interval___PAD* %an_interval, i32 0, i32 0, i32 0         ; <i32*> [#uses=2]
+       store i32 1, i32* %tmp5, align 8
+       %tmp10 = getelementptr %struct.placeholder__T5b* %tmp34, i32 0, i32 1, i32 0            ; <i32*> [#uses=1]
+       store i32 1, i32* %tmp10, align 4
+       %tmp82 = load i32* %tmp5, align 8               ; <i32> [#uses=5]
+       %tmp83 = icmp slt i32 %tmp82, 6         ; <i1> [#uses=1]
+       %min84 = select i1 %tmp83, i32 %tmp82, i32 5            ; <i32> [#uses=3]
+       %tmp85 = icmp sgt i32 %min84, -1                ; <i1> [#uses=2]
+       %min84.cast193 = zext i32 %min84 to i64         ; <i64> [#uses=1]
+       %min84.cast193.op = shl i64 %min84.cast193, 33          ; <i64> [#uses=1]
+       %tmp104 = icmp sgt i32 %tmp82, -1               ; <i1> [#uses=2]
+       %tmp103.cast192 = zext i32 %tmp82 to i64                ; <i64> [#uses=1]
+       %tmp103.cast192.op = shl i64 %tmp103.cast192, 33                ; <i64> [#uses=1]
+       %min84.cast193.op.op = ashr i64 %min84.cast193.op, 28           ; <i64> [#uses=1]
+       %sextr121 = select i1 %tmp85, i64 %min84.cast193.op.op, i64 0           ; <i64> [#uses=2]
+       %tmp103.cast192.op.op = ashr i64 %tmp103.cast192.op, 28         ; <i64> [#uses=1]
+       %sextr123 = select i1 %tmp104, i64 %tmp103.cast192.op.op, i64 0         ; <i64> [#uses=2]
+       %tmp124 = icmp sle i64 %sextr121, %sextr123             ; <i1> [#uses=1]
+       %min125 = select i1 %tmp124, i64 %sextr121, i64 %sextr123               ; <i64> [#uses=1]
+       %sextr131194 = and i64 %min125, 34359738336             ; <i64> [#uses=1]
+       %tmp134 = add i64 %sextr131194, 63              ; <i64> [#uses=1]
+       lshr i64 %tmp134, 3             ; <i64>:0 [#uses=1]
+       %tmp150188.shrunk = trunc i64 %0 to i32         ; <i32> [#uses=1]
+       %tmp159 = and i32 %tmp150188.shrunk, -4         ; <i32> [#uses=1]
+       %tmp161 = alloca i8, i32 %tmp159                ; <i8*> [#uses=1]
+       %min167.op = shl i32 %min84, 2          ; <i32> [#uses=1]
+       %tmp170 = select i1 %tmp85, i32 %min167.op, i32 0               ; <i32> [#uses=2]
+       %tmp173.op = shl i32 %tmp82, 2          ; <i32> [#uses=1]
+       %tmp176 = select i1 %tmp104, i32 %tmp173.op, i32 0              ; <i32> [#uses=2]
+       %tmp177 = icmp sle i32 %tmp170, %tmp176         ; <i1> [#uses=1]
+       %min178 = select i1 %tmp177, i32 %tmp170, i32 %tmp176           ; <i32> [#uses=1]
+       %tmp179 = add i32 %min178, 7            ; <i32> [#uses=1]
+       %tmp180 = and i32 %tmp179, -4           ; <i32> [#uses=1]
+       %tmp183185 = bitcast %struct.placeholder__an_interval___PAD* %an_interval to i8*                ; <i8*> [#uses=1]
+       call void @llvm.memcpy.i32( i8* %tmp161, i8* %tmp183185, i32 %tmp180, i32 4 )
+       ret void
+}
+
+declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind