1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -S -passes=memcpyopt -verify-memoryssa | FileCheck %s 3target 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" 4 5declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind 6declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) nounwind 7 8; The resulting memset is only 4-byte aligned, despite containing 9; a 16-byte aligned store in the middle. 10 11define void @foo(ptr %p) { 12; CHECK-LABEL: @foo( 13; CHECK-NEXT: [[A1:%.*]] = getelementptr i32, ptr [[P:%.*]], i64 1 14; CHECK-NEXT: [[A2:%.*]] = getelementptr i32, ptr [[P]], i64 2 15; CHECK-NEXT: [[A3:%.*]] = getelementptr i32, ptr [[P]], i64 3 16; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[P]], i8 0, i64 16, i1 false) 17; CHECK-NEXT: ret void 18; 19 store i32 0, ptr %p, align 4 20 %a1 = getelementptr i32, ptr %p, i64 1 21 store i32 0, ptr %a1, align 16 22 %a2 = getelementptr i32, ptr %p, i64 2 23 store i32 0, ptr %a2, align 4 24 %a3 = getelementptr i32, ptr %p, i64 3 25 store i32 0, ptr %a3, align 4 26 ret void 27} 28 29; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4. 30 31define void @bar() { 32; CHECK-LABEL: @bar( 33; CHECK-NEXT: [[A4:%.*]] = alloca i32, align 8 34; CHECK-NEXT: [[A8:%.*]] = alloca i32, align 8 35; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 8 [[A4]], i8 0, i64 4, i1 false) 36; CHECK-NEXT: ret void 37; 38 %a4 = alloca i32, align 4 39 %a8 = alloca i32, align 8 40 call void @llvm.memset.p0.i64(ptr align 8 %a8, i8 0, i64 4, i1 false) 41 call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a4, ptr align 4 %a8, i64 4, i1 false) 42 ret void 43} 44