| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame^] | 1 | ; RUN: opt < %s -S -basicaa -memcpyopt | FileCheck %s |
| 2 | 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" |
| 3 | |
| 4 | declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind |
| 5 | declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind |
| 6 | |
| 7 | ; The resulting memset is only 4-byte aligned, despite containing |
| 8 | ; a 16-byte aligned store in the middle. |
| 9 | |
| 10 | define void @foo(i32* %p) { |
| 11 | ; CHECK-LABEL: @foo( |
| 12 | ; CHECK: call void @llvm.memset.p0i8.i64(i8* align 4 {{.*}}, i8 0, i64 16, i1 false) |
| 13 | %a0 = getelementptr i32, i32* %p, i64 0 |
| 14 | store i32 0, i32* %a0, align 4 |
| 15 | %a1 = getelementptr i32, i32* %p, i64 1 |
| 16 | store i32 0, i32* %a1, align 16 |
| 17 | %a2 = getelementptr i32, i32* %p, i64 2 |
| 18 | store i32 0, i32* %a2, align 4 |
| 19 | %a3 = getelementptr i32, i32* %p, i64 3 |
| 20 | store i32 0, i32* %a3, align 4 |
| 21 | ret void |
| 22 | } |
| 23 | |
| 24 | ; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4. |
| 25 | |
| 26 | define void @bar() { |
| 27 | ; CHECK-LABEL: @bar( |
| 28 | ; CHECK: %a4 = alloca i32, align 8 |
| 29 | ; CHECK-NOT: memcpy |
| 30 | %a4 = alloca i32, align 4 |
| 31 | %a8 = alloca i32, align 8 |
| 32 | %a8.cast = bitcast i32* %a8 to i8* |
| 33 | %a4.cast = bitcast i32* %a4 to i8* |
| 34 | call void @llvm.memset.p0i8.i64(i8* align 8 %a8.cast, i8 0, i64 4, i1 false) |
| 35 | call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %a4.cast, i8* align 4 %a8.cast, i64 4, i1 false) |
| 36 | ret void |
| 37 | } |