| // 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: %a = alloca i32 |
| |
| register int a asm("rsi")=5; |
| // CHECK: store i32 5, i32* %a |
| |
| asm volatile("; %0 This asm defines rsi" : "=r"(a)); |
| // CHECK: %0 = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"() |
| // CHECK: store i32 %0, i32* %a |
| |
| a = 42; |
| // CHECK: store i32 42, i32* %a |
| |
| asm volatile("; %0 This asm uses rsi" : : "r"(a)); |
| // CHECK: %tmp = load i32* %a |
| // CHECK: call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 %tmp) |
| |
| return a; |
| // CHECK: %tmp1 = load i32* %a |
| // CHECK: ret i32 %tmp1 |
| } |
