| ; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility %s | FileCheck %s |
| |
| target datalayout = "e-p:64:64" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @vt1 = constant [2 x ptr] [ptr @vf1a, ptr @vf1b], !type !0 |
| @vt2 = constant [2 x ptr] [ptr @vf2a, ptr @vf2b], !type !0 |
| |
| @sink = external global i32 |
| |
| define i32 @vf1a(ptr %this, i32 %arg) { |
| store i32 %arg, ptr @sink |
| ret i32 %arg |
| } |
| |
| define i32 @vf2a(ptr %this, i32 %arg) { |
| store i32 %arg, ptr @sink |
| ret i32 %arg |
| } |
| |
| define i32 @vf1b(ptr %this, i32 %arg) { |
| ret i32 %arg |
| } |
| |
| define i32 @vf2b(ptr %this, i32 %arg) { |
| ret i32 %arg |
| } |
| |
| ; Test that we don't apply VCP if the virtual function body accesses memory, |
| ; even if the function returns a constant. |
| |
| ; CHECK: define i32 @call1 |
| define i32 @call1(ptr %obj) { |
| %vtable = load ptr, ptr %obj |
| %p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid") |
| call void @llvm.assume(i1 %p) |
| %fptr = load ptr, ptr %vtable |
| ; CHECK: call i32 % |
| %result = call i32 %fptr(ptr %obj, i32 1) |
| ret i32 %result |
| } |
| |
| ; Test that we can apply VCP regardless of the function attributes by analyzing |
| ; the function body itself. |
| |
| ; CHECK: define i32 @call2 |
| define i32 @call2(ptr %obj) { |
| %vtable = load ptr, ptr %obj |
| %p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid") |
| call void @llvm.assume(i1 %p) |
| %fptrptr = getelementptr [1 x ptr], ptr %vtable, i32 0, i32 1 |
| %fptr = load ptr, ptr %fptrptr |
| %result = call i32 %fptr(ptr %obj, i32 1) |
| ; CHECK: ret i32 1 |
| ret i32 %result |
| } |
| |
| declare i1 @llvm.type.test(ptr, metadata) |
| declare void @llvm.assume(i1) |
| |
| !0 = !{i32 0, !"typeid"} |