test/FrontendC/asm-reg-var-local.c

   1 // RUN: %llvmgcc %s -S -o - | FileCheck %s
   2 // Exercise various use cases for local asm "register variables".
   3 // XFAIL: *
   4 // XTARGET: x86_64,i686,i386
   5
   6 int foo() {
   7 // CHECK: %a = alloca i32
   8
   9   register int a asm("rsi")=5;
  10 // CHECK: store i32 5, i32* %a, align 4
  11
  12   asm volatile("; %0 This asm defines rsi" : "=r"(a));
  13 // CHECK: %asmtmp = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi}
  14 // CHECK: store i32 %asmtmp, i32* %a
  15
  16   a = 42;
  17 // CHECK:  store i32 42, i32* %a, align 4
  18
  19   asm volatile("; %0 This asm uses rsi" : : "r"(a));
  20 // CHECK:  %1 = load i32* %a, align 4
  21 // CHECK:  call void asm sideeffect "", "{rsi}"(i32 %1) nounwind
  22 // CHECK:  %2 = call i32 asm sideeffect "", "={rsi}"() nounwind
  23 // CHECK:  call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 %2)
  24
  25   return a;
  26 // CHECK:  %3 = load i32* %a, align 4
  27 // CHECK:  call void asm sideeffect "", "{rsi}"(i32 %3) nounwind
  28 // CHECK:  %4 = call i32 asm sideeffect "", "={rsi}"() nounwind
  29 // CHECK:  store i32 %4, i32* %0, align 4
  30 // CHECK:  %5 = load i32* %0, align 4
  31 // CHECK:  store i32 %5, i32* %retval, align 4
  32 }