asm-reg-var-local.c revision d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5
13883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher// RUN: %clang_cc1 %s -triple x86_64-apple-darwin -emit-llvm -o - | FileCheck %s 23883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher// Exercise various use cases for local asm "register variables". 33883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher 43883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopherint foo() { 5d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 63883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher 73883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher register int a asm("rsi")=5; 8d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: store i32 5, i32* [[A]] 93883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher 103883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher asm volatile("; %0 This asm defines rsi" : "=r"(a)); 11d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"() 12d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: store i32 [[Z]], i32* [[A]] 133883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher 143883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher a = 42; 15d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: store i32 42, i32* [[A]] 163883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher 173883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher asm volatile("; %0 This asm uses rsi" : : "r"(a)); 18d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32* [[A]] 19d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) 203883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher 213883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher return a; 22d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32* [[A]] 23d579a8855d8b7aef3a2efaea218ac5e8f5b42fa5Eric Christopher// CHECK: ret i32 [[TMP1]] 243883e66cfd55de70d89831cf26f9ae53931d11d3Eric Christopher} 25