r302835 - Issue diagnostics when returning FP values on x86_64 without SSE1/2

[Reid Kleckner via cfe-commits]

Author: rnk
Date: Thu May 11 17:43:02 2017
New Revision: 302835

URL: http://llvm.org/viewvc/llvm-project?rev=302835&view=rev
Log:
Issue diagnostics when returning FP values on x86_64 without SSE1/2

Avoid using report_fatal_error, because it will ask the user to file a
bug. If the user attempts to disable SSE on x86_64 and them use floating
point, that's a bug in their code, not a bug in the compiler.

This is just a start. There are other ways to crash the backend in this
configuration, but they should be updated to follow this pattern.

Differential Revision: https://reviews.llvm.org/D27522

Added:
    cfe/trunk/test/CodeGen/x86_64-mno-sse.c

Added: cfe/trunk/test/CodeGen/x86_64-mno-sse.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/x86_64-mno-sse.c?rev=302835&view=auto
==============================================================================
--- cfe/trunk/test/CodeGen/x86_64-mno-sse.c (added)
+++ cfe/trunk/test/CodeGen/x86_64-mno-sse.c Thu May 11 17:43:02 2017
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -triple x86_64-linux -target-feature -sse -target-feature -sse2 -S -o /dev/null -verify %s
+// REQUIRES: x86-registered-target
+
+double f1(void) { // expected-error {{SSE register return with SSE disabled}}
+  return 1.4;
+}
+extern double g;
+void f2(void) { // expected-error {{SSE register return with SSE disabled}}
+  g = f1();
+}
+void take_double(double);
+void pass_double(void) {
+  // FIXME: Still asserts.
+  //take_double(1.5);
+}