1 // RUN: %clang_cc1 -triple x86_64 -emit-llvm -o - %s | FileCheck %s
2
3 // Check that we don't generate unnecessary reloads.
4 //
5 // CHECK-LABEL: define void @f0()
6 // CHECK: [[x_0:%.*]] = alloca i32, align 4
7 // CHECK-NEXT: [[y_0:%.*]] = alloca i32, align 4
8 // CHECK-NEXT: store i32 1, i32* [[x_0]]
9 // CHECK-NEXT: store i32 1, i32* [[x_0]]
10 // CHECK-NEXT: store i32 1, i32* [[y_0]]
11 // CHECK: }
f0()12 void f0() {
13 int x, y;
14 x = 1;
15 y = (x = 1);
16 }
17
18 // This used to test that we generate reloads for volatile access,
19 // but that does not appear to be correct behavior for C.
20 //
21 // CHECK-LABEL: define void @f1()
22 // CHECK: [[x_1:%.*]] = alloca i32, align 4
23 // CHECK-NEXT: [[y_1:%.*]] = alloca i32, align 4
24 // CHECK-NEXT: store volatile i32 1, i32* [[x_1]]
25 // CHECK-NEXT: store volatile i32 1, i32* [[x_1]]
26 // CHECK-NEXT: store volatile i32 1, i32* [[y_1]]
27 // CHECK: }
f1()28 void f1() {
29 volatile int x, y;
30 x = 1;
31 y = (x = 1);
32 }
33