1 // RUN: %clang_cc1 %s -triple x86_64-apple-darwin -emit-llvm -o - | FileCheck %s 2 // Exercise various use cases for local asm "register variables". 3 4 int foo() { 5 // CHECK-LABEL: define i32 @foo() 6 // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 7 8 register int a asm("rsi")=5; 9 // CHECK: store i32 5, i32* [[A]] 10 11 asm volatile("; %0 This asm defines rsi" : "=r"(a)); 12 // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"() 13 // CHECK: store i32 [[Z]], i32* [[A]] 14 15 a = 42; 16 // CHECK: store i32 42, i32* [[A]] 17 18 asm volatile("; %0 This asm uses rsi" : : "r"(a)); 19 // CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] 20 // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) 21 22 return a; 23 // CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] 24 // CHECK: ret i32 [[TMP1]] 25 } 26 27 int earlyclobber() { 28 // CHECK-LABEL: define i32 @earlyclobber() 29 // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 30 31 register int a asm("rsi")=5; 32 // CHECK: store i32 5, i32* [[A]] 33 34 asm volatile("; %0 This asm defines rsi" : "=&r"(a)); 35 // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "=&{rsi},~{dirflag},~{fpsr},~{flags}"() 36 // CHECK: store i32 [[Z]], i32* [[A]] 37 38 a = 42; 39 // CHECK: store i32 42, i32* [[A]] 40 41 asm volatile("; %0 This asm uses rsi" : : "r"(a)); 42 // CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] 43 // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) 44 45 return a; 46 // CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] 47 // CHECK: ret i32 [[TMP1]] 48 } 49
