Produce a better diagnostic for global register variables.
Currently, when there is a global register variable in a program that
is bound to an invalid register, clang/llvm prints an error message that
is not very user-friendly.
This commit improves the diagnostic and moves the check that used to be
in the backend to Sema. In addition, it makes changes to error out if
the size of the register doesn't match the declared variable size.
e.g., volatile register int B asm ("rbp");
rdar://problem/23084219
Differential Revision: http://reviews.llvm.org/D13834
llvm-svn: 253405
diff --git a/clang/test/OpenMP/atomic_update_codegen.cpp b/clang/test/OpenMP/atomic_update_codegen.cpp
index df8b538..063b76d 100644
--- a/clang/test/OpenMP/atomic_update_codegen.cpp
+++ b/clang/test/OpenMP/atomic_update_codegen.cpp
@@ -72,7 +72,10 @@
typedef float float2 __attribute__((ext_vector_type(2)));
float2 float2x;
-register int rix __asm__("0");
+// Register "0" is currently an invalid register for global register variables.
+// Use "esp" instead of "0".
+// register int rix __asm__("0");
+register int rix __asm__("esp");
int main() {
// CHECK-NOT: atomicrmw