xref: /llvm-project/llvm/test/Transforms/InstCombine/memcpy-1.ll (revision 4ab40eca080965c65802710e39adbb78c4ce7bde)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; Test that the memcpy library call simplifier works correctly.
3;
4; RUN: opt < %s -passes=instcombine -S | FileCheck %s
5
6target 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-f80:128:128"
7
8declare ptr @memcpy(ptr, ptr, i32)
9
10; Check memcpy(mem1, mem2, size) -> llvm.memcpy(mem1, mem2, size, 1).
11
12define ptr @test_simplify1(ptr %mem1, ptr %mem2, i32 %size) {
13; CHECK-LABEL: @test_simplify1(
14; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[MEM1:%.*]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
15; CHECK-NEXT:    ret ptr [[MEM1]]
16;
17  %ret = call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
18  ret ptr %ret
19}
20
21; Verify that the strictfp attr doesn't block this optimization.
22
23define ptr @test_simplify2(ptr %mem1, ptr %mem2, i32 %size) strictfp {
24; CHECK-LABEL: @test_simplify2(
25; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[MEM1:%.*]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false) #[[ATTR0:[0-9]+]]
26; CHECK-NEXT:    ret ptr [[MEM1]]
27;
28  %ret = call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size) strictfp
29  ret ptr %ret
30}
31
32; Verify that the first parameter to memcpy could itself be a call that's not
33; tail, while the call to @memcpy could be tail.
34declare ptr @get_dest()
35
36define ptr @test_simplify3(ptr %mem2, i32 %size) {
37; CHECK-LABEL: @test_simplify3(
38; CHECK-NEXT:    [[DEST:%.*]] = call ptr @get_dest()
39; CHECK-NEXT:    tail call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[DEST]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
40; CHECK-NEXT:    ret ptr [[DEST]]
41;
42
43  %dest = call ptr @get_dest()
44  %ret = tail call ptr @memcpy(ptr %dest, ptr %mem2, i32 %size)
45  ret ptr %ret
46}
47
48define ptr @test_no_incompatible_attr(ptr %mem1, ptr %mem2, i32 %size) {
49; CHECK-LABEL: @test_no_incompatible_attr(
50; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[MEM1:%.*]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
51; CHECK-NEXT:    ret ptr [[MEM1]]
52;
53
54  %ret = call dereferenceable(1) ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
55  ret ptr %ret
56}
57
58define ptr @test_no_simplify1(ptr %mem1, ptr %mem2, i32 %size) {
59; CHECK-LABEL: @test_no_simplify1(
60; CHECK-NEXT:    [[RET:%.*]] = musttail call ptr @memcpy(ptr [[MEM1:%.*]], ptr [[MEM2:%.*]], i32 [[SIZE:%.*]])
61; CHECK-NEXT:    ret ptr [[RET]]
62;
63  %ret = musttail call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
64  ret ptr %ret
65}
66