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 ptr @memcpy(ptr, ptr, i32)
10 ; Check memcpy(mem1, mem2, size) -> llvm.memcpy(mem1, mem2, size, 1).
12 define 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]]
17 %ret = call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
21 ; Verify that the strictfp attr doesn't block this optimization.
23 define 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]]
28 %ret = call ptr @memcpy(ptr %mem1, ptr %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 ptr @get_dest()
36 define 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]]
43 %dest = call ptr @get_dest()
44 %ret = tail call ptr @memcpy(ptr %dest, ptr %mem2, i32 %size)
48 define 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]]
54 %ret = call dereferenceable(1) ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
58 define 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]]
63 %ret = musttail call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)