Re-add SystemZ SNaN test

The floating-point bug affecting ninja-x64-msvc-RA-centos6 is fixed (r277813) so this test should
now pass

llvm-svn: 278034

diff --git a/llvm/test/CodeGen/SystemZ/fp-const-10.ll b/llvm/test/CodeGen/SystemZ/fp-const-10.ll
new file mode 100644 (file)
index 0000000..cb00eb6
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/fp-const-10.ll
@@ -0,0 +1,15 @@
+; Test loads of SNaN.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Test that we don't do an FP extending load, as this would result in a
+; converstion to QNaN.
+define double @f1() {
+; CHECK-LABEL: .LCPI0_0
+; CHECK:      .quad   9219994337134247936
+; CHECK-LABEL: f1:
+; CHECK:      larl    %r1, .LCPI0_0
+; CHECK-NOT:  ldeb    %f0, 0(%r1)
+; CHECK:      ld      %f0, 0(%r1)
+  ret double 0x7FF4000000000000
+}