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: } 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: } 28 void f1() { 29 volatile int x, y; 30 x = 1; 31 y = (x = 1); 32 } 33
