-; RUN: opt < %s -S -memcpyopt | FileCheck %s
+; RUN: opt < %s -S -basicaa -memcpyopt | FileCheck %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64"
-; The resulting memset is only 4-byte aligned, despite containing
-; a 16-byte alignmed store in the middle.
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
-; CHECK: call void @llvm.memset.i64(i8* %a01, i8 0, i64 16, i32 4)
+; The resulting memset is only 4-byte aligned, despite containing
+; a 16-byte aligned store in the middle.
define void @foo(i32* %p) {
- %a0 = getelementptr i32* %p, i64 0
+; CHECK-LABEL: @foo(
+; CHECK: call void @llvm.memset.p0i8.i64(i8* {{.*}}, i8 0, i64 16, i32 4, i1 false)
+ %a0 = getelementptr i32, i32* %p, i64 0
store i32 0, i32* %a0, align 4
- %a1 = getelementptr i32* %p, i64 1
+ %a1 = getelementptr i32, i32* %p, i64 1
store i32 0, i32* %a1, align 16
- %a2 = getelementptr i32* %p, i64 2
+ %a2 = getelementptr i32, i32* %p, i64 2
store i32 0, i32* %a2, align 4
- %a3 = getelementptr i32* %p, i64 3
+ %a3 = getelementptr i32, i32* %p, i64 3
store i32 0, i32* %a3, align 4
ret void
}
+
+; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4.
+
+define void @bar() {
+; CHECK-LABEL: @bar(
+; CHECK: %a4 = alloca i32, align 8
+; CHECK-NOT: memcpy
+ %a4 = alloca i32, align 4
+ %a8 = alloca i32, align 8
+ %a8.cast = bitcast i32* %a8 to i8*
+ %a4.cast = bitcast i32* %a4 to i8*
+ call void @llvm.memset.p0i8.i64(i8* %a8.cast, i8 0, i64 4, i32 8, i1 false)
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a4.cast, i8* %a8.cast, i64 4, i32 4, i1 false)
+ ret void
+}