1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test that the memcpy library call simplifier works correctly.
4 ; RUN: opt < %s -passes=instcombine -S | FileCheck %s
6 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-f80:128:128"
8 declare i8* @memcpy(i8*, i8*, i32)
10 ; Check memcpy(mem1, mem2, size) -> llvm.memcpy(mem1, mem2, size, 1).
12 define i8* @test_simplify1(i8* %mem1, i8* %mem2, i32 %size) {
13 ; CHECK-LABEL: @test_simplify1(
14 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[MEM1:%.*]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
15 ; CHECK-NEXT: ret i8* [[MEM1]]
17 %ret = call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)
21 ; Verify that the strictfp attr doesn't block this optimization.
23 define i8* @test_simplify2(i8* %mem1, i8* %mem2, i32 %size) strictfp {
24 ; CHECK-LABEL: @test_simplify2(
25 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[MEM1:%.*]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false) #[[ATTR0:[0-9]+]]
26 ; CHECK-NEXT: ret i8* [[MEM1]]
28 %ret = call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size) strictfp
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.
34 declare i8* @get_dest()
36 define i8* @test_simplify3(i8* %mem2, i32 %size) {
37 ; CHECK-LABEL: @test_simplify3(
38 ; CHECK-NEXT: [[DEST:%.*]] = call i8* @get_dest()
39 ; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[DEST]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
40 ; CHECK-NEXT: ret i8* [[DEST]]
43 %dest = call i8* @get_dest()
44 %ret = tail call i8* @memcpy(i8* %dest, i8* %mem2, i32 %size)
48 define i8* @test_no_incompatible_attr(i8* %mem1, i8* %mem2, i32 %size) {
49 ; CHECK-LABEL: @test_no_incompatible_attr(
50 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[MEM1:%.*]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
51 ; CHECK-NEXT: ret i8* [[MEM1]]
54 %ret = call dereferenceable(1) i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)
58 define i8* @test_no_simplify1(i8* %mem1, i8* %mem2, i32 %size) {
59 ; CHECK-LABEL: @test_no_simplify1(
60 ; CHECK-NEXT: [[RET:%.*]] = musttail call i8* @memcpy(i8* [[MEM1:%.*]], i8* [[MEM2:%.*]], i32 [[SIZE:%.*]])
61 ; CHECK-NEXT: ret i8* [[RET]]
63 %ret = musttail call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)