https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87626

[Umesh Kalappa <umesh.kalappa0@gmail.com>]

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Hi All,

The attached patch (pr85667.patch) fixes the subjected issue .
we tested on x86_64(linux and windows both) and no regress found .

ok to commit ?

Thank you
~Umesh

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diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1a70b8f..f385e24 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-11-15  Lokesh Janghel <lokeshjanghel91@gmail.com>
+
+	PR  target/85667
+	* i386.c (function_value_ms_64): ms_abi insist don't use the sse
+	(xmm0) register when returning structs whose size is less than 
+	or equal to the 8 byte.
+
 2018-11-14  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/87985
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 76a92b1..70dfc98 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -9008,7 +9008,7 @@ function_value_ms_64 (machine_mode orig_mode, machine_mode mode,
 	case 8:
 	case 4:
 	  if (mode == SFmode || mode == DFmode)
-	    regno = FIRST_SSE_REG;
+	    regno = AX_REG;
 	  break;
 	default:
 	  break;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 50e53f0..5b76261 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-11-15 Lokesh Janghel  <lokeshjanghel91@gmail.com>
+
+	PR target/85667
+	* gcc.target/pr85667.c: New testcase.
+ 
 2018-11-14  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/87985
diff --git a/gcc/testsuite/gcc.target/i386/pr85667.c b/gcc/testsuite/gcc.target/i386/pr85667.c
new file mode 100644
index 0000000..657a0f0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr85667.c
@@ -0,0 +1,20 @@
+/* { dg-options "-O2 " } */
+/* { dg-final { scan-assembler-times "movl\[\t \]\.\[a-zA-Z\]\[a-zA-Z\]\[0-9\]\\(%rip\\), %eax" 1} } */
+typedef struct
+{
+  float x;
+} Float;
+
+Float  __attribute__((ms_abi)) fn1()
+{
+  Float v;
+  v.x = 3.145;
+  return v;
+}
+
+Float fn2 ()
+{
+  Float v;
+  v.x = 3.145;
+  return v;
+}