| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; RUN: opt -S -wholeprogramdevirt %s | FileCheck %s |
| 2 | ; RUN: opt -S -passes=wholeprogramdevirt %s | FileCheck %s |
| 3 | |
| 4 | target datalayout = "e-p:64:64" |
| 5 | target triple = "x86_64-unknown-linux-gnu" |
| 6 | |
| 7 | @vt1 = constant [2 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf1a to i8*), i8* bitcast (i32 (i8*, i32)* @vf1b to i8*)], !type !0 |
| 8 | @vt2 = constant [2 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2a to i8*), i8* bitcast (i32 (i8*, i32)* @vf2b to i8*)], !type !0 |
| 9 | |
| 10 | @sink = external global i32 |
| 11 | |
| 12 | define i32 @vf1a(i8* %this, i32 %arg) { |
| 13 | store i32 %arg, i32* @sink |
| 14 | ret i32 %arg |
| 15 | } |
| 16 | |
| 17 | define i32 @vf2a(i8* %this, i32 %arg) { |
| 18 | store i32 %arg, i32* @sink |
| 19 | ret i32 %arg |
| 20 | } |
| 21 | |
| 22 | define i32 @vf1b(i8* %this, i32 %arg) { |
| 23 | ret i32 %arg |
| 24 | } |
| 25 | |
| 26 | define i32 @vf2b(i8* %this, i32 %arg) { |
| 27 | ret i32 %arg |
| 28 | } |
| 29 | |
| 30 | ; Test that we don't apply VCP if the virtual function body accesses memory, |
| 31 | ; even if the function returns a constant. |
| 32 | |
| 33 | ; CHECK: define i32 @call1 |
| 34 | define i32 @call1(i8* %obj) { |
| 35 | %vtableptr = bitcast i8* %obj to [1 x i8*]** |
| 36 | %vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr |
| 37 | %vtablei8 = bitcast [1 x i8*]* %vtable to i8* |
| 38 | %p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid") |
| 39 | call void @llvm.assume(i1 %p) |
| 40 | %fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0 |
| 41 | %fptr = load i8*, i8** %fptrptr |
| 42 | %fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)* |
| 43 | ; CHECK: call i32 % |
| 44 | %result = call i32 %fptr_casted(i8* %obj, i32 1) |
| 45 | ret i32 %result |
| 46 | } |
| 47 | |
| 48 | ; Test that we can apply VCP regardless of the function attributes by analyzing |
| 49 | ; the function body itself. |
| 50 | |
| 51 | ; CHECK: define i32 @call2 |
| 52 | define i32 @call2(i8* %obj) { |
| 53 | %vtableptr = bitcast i8* %obj to [1 x i8*]** |
| 54 | %vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr |
| 55 | %vtablei8 = bitcast [1 x i8*]* %vtable to i8* |
| 56 | %p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid") |
| 57 | call void @llvm.assume(i1 %p) |
| 58 | %fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 1 |
| 59 | %fptr = load i8*, i8** %fptrptr |
| 60 | %fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)* |
| 61 | %result = call i32 %fptr_casted(i8* %obj, i32 1) |
| 62 | ; CHECK: ret i32 1 |
| 63 | ret i32 %result |
| 64 | } |
| 65 | |
| 66 | declare i1 @llvm.type.test(i8*, metadata) |
| 67 | declare void @llvm.assume(i1) |
| 68 | |
| 69 | !0 = !{i32 0, !"typeid"} |