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