Add support for declaring register contraints in variables. They are only used
in asm statements:
register int foo asm("rdi");
asm("..." : ... "r" (foo) ...
We also only accept these variables if the constraint in the asm statement is "r".
This fixes most of PR3933.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122643 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/asm-variable.c b/test/CodeGen/asm-variable.c
new file mode 100644
index 0000000..7f74913
--- /dev/null
+++ b/test/CodeGen/asm-variable.c
@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm %s -o - | FileCheck %s
+
+unsigned long long foo(unsigned long long addr, unsigned long long a0,
+ unsigned long long a1, unsigned long long a2,
+ unsigned long long a3, unsigned long long a4,
+ unsigned long long a5) {
+ register unsigned long long result asm("rax");
+ register unsigned long long b0 asm("rdi");
+ register unsigned long long b1 asm("rsi");
+ register unsigned long long b2 asm("rdx");
+ register unsigned long long b3 asm("rcx");
+ register unsigned long long b4 asm("r8");
+ register unsigned long long b5 asm("r9");
+
+ b0 = a0;
+ b1 = a1;
+ b2 = a2;
+ b3 = a3;
+ b4 = a4;
+ b5 = a5;
+
+ asm("call *%1" : "=r" (result)
+ : "r"(addr), "r" (b0), "r" (b1), "r" (b2), "r" (b3), "r" (b4), "r" (b5));
+ return result;
+}
+
+// CHECK: call i64 asm "call *$1", "={rax},r,{rdi},{rsi},{rdx},{rcx},{r8},{r9},~{dirflag},~{fpsr},~{flags}"