ms-inline-asm: Add a test to ensure that call doesn't clobber eax.

[rnk]

Shouldn't it clobber eax?

[• ehsan]

Why should it? We can't know whether the callee is going to clobber it or not.

[• ehsan]

ping?

[rnk]

Feel free to commit as a way to codify our current behavior, but I'm not sure it's the right approach. We might want to throw up our hands on control flow and assume it clobbers everything except ebp/esp.

[rnk]

Marking it accepted, for real.

[• ehsan]

Closed by commit rL214401 (authored by @ehsan).

cfe/trunk/test/CodeGen/ms-inline-asm.c

// CHECK: mov es, word ptr $2
   __asm mov fs, a;
 // CHECK: mov fs, word ptr $3
   __asm mov gs, a;
 // CHECK: mov gs, word ptr $4
   __asm mov ss, a;
 // CHECK: mov ss, word ptr $5
 // CHECK: "*m,*m,*m,*m,*m,*m,~{dirflag},~{fpsr},~{flags}"(i16* {{.*}}, i16* {{.*}}, i16* {{.*}}, i16* {{.*}}, i16* {{.*}}, i16* {{.*}})
 }
+
+void call_clobber() {
+  __asm call t41
+  // CHECK-LABEL: define void @call_clobber
+  // CHECK: call void asm sideeffect inteldialect "call $0", "r,~{dirflag},~{fpsr},~{flags}"(void (i16)* @t41)
+}