| // RUN: %clang_cc1 %s -triple x86_64-apple-darwin -emit-llvm -o - | FileCheck %s |
| // Exercise various use cases for local asm "register variables". |
| |
| int foo() { |
| // CHECK-LABEL: define i32 @foo() |
| // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 |
| |
| register int a asm("rsi")=5; |
| // CHECK: store i32 5, i32* [[A]] |
| |
| asm volatile("; %0 This asm defines rsi" : "=r"(a)); |
| // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"() |
| // CHECK: store i32 [[Z]], i32* [[A]] |
| |
| a = 42; |
| // CHECK: store i32 42, i32* [[A]] |
| |
| asm volatile("; %0 This asm uses rsi" : : "r"(a)); |
| // CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
| // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) |
| |
| return a; |
| // CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
| // CHECK: ret i32 [[TMP1]] |
| } |
| |
| int earlyclobber() { |
| // CHECK-LABEL: define i32 @earlyclobber() |
| // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32 |
| |
| register int a asm("rsi")=5; |
| // CHECK: store i32 5, i32* [[A]] |
| |
| asm volatile("; %0 This asm defines rsi" : "=&r"(a)); |
| // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "=&{rsi},~{dirflag},~{fpsr},~{flags}"() |
| // CHECK: store i32 [[Z]], i32* [[A]] |
| |
| a = 42; |
| // CHECK: store i32 42, i32* [[A]] |
| |
| asm volatile("; %0 This asm uses rsi" : : "r"(a)); |
| // CHECK: [[TMP:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
| // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]]) |
| |
| return a; |
| // CHECK: [[TMP1:%[a-zA-Z0-9]+]] = load i32, i32* [[A]] |
| // CHECK: ret i32 [[TMP1]] |
| } |
