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 4int 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 27int 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