Set FLT_EVAL_METHOD to 2 only if 387 FPU is used

When 387 FPU isn't used, there is no excess precision.  We should set
FLT_EVAL_METHOD to 2 only if 387 FPU is used.

gcc/

	PR target/69225
	* config/i386/i386.h (TARGET_FLT_EVAL_METHOD): Set to 2 only if
	TARGET_80387 is true.

gcc/testsuite

	PR target/69225
	* gcc.target/i386/pr69225-1.c: New test.
	* gcc.target/i386/pr69225-2.c: Likewise.
	* gcc.target/i386/pr69225-3.c: Likewise.
	* gcc.target/i386/pr69225-4.c: Likewise.
	* gcc.target/i386/pr69225-5.c: Likewise.
	* gcc.target/i386/pr69225-6.c: Likewise.

From-SVN: r232249

gcc/ChangeLog

+2016-01-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/69225
+	* config/i386/i386.h (TARGET_FLT_EVAL_METHOD): Set to 2 only if
+	TARGET_80387 is true.
+
 2016-01-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/69071

gcc/config/i386/i386.h

@@ -694,7 +694,7 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
    the rounding precision is indeterminate, since either may be chosen
    apparently at random.  */
 #define TARGET_FLT_EVAL_METHOD \
-  (TARGET_MIX_SSE_I387 ? -1 : TARGET_SSE_MATH ? 0 : 2)
+  (TARGET_MIX_SSE_I387 ? -1 : (TARGET_80387 && !TARGET_SSE_MATH) ? 2 : 0)
 
 /* Whether to allow x87 floating-point arithmetic on MODE (one of
    SFmode, DFmode and XFmode) in the current excess precision

gcc/testsuite/ChangeLog

+2016-01-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/69225
+	* gcc.target/i386/pr69225-1.c: New test.
+	* gcc.target/i386/pr69225-2.c: Likewise.
+	* gcc.target/i386/pr69225-3.c: Likewise.
+	* gcc.target/i386/pr69225-4.c: Likewise.
+	* gcc.target/i386/pr69225-5.c: Likewise.
+	* gcc.target/i386/pr69225-6.c: Likewise.
+
 2016-01-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/67462

gcc/testsuite/gcc.target/i386/pr69225-1.c

+/* { dg-do compile} */
+/* { dg-options "-msse2 -mfpmath=sse" } */
+
+#include <float.h>
+
+#if FLT_EVAL_METHOD != 0
+# error FLT_EVAL_METHOD != 0
+#endif

gcc/testsuite/gcc.target/i386/pr69225-2.c

+/* { dg-do compile} */
+/* { dg-options "-mno-sse -mno-80387" } */
+
+#include <float.h>
+
+#if FLT_EVAL_METHOD != 0
+# error FLT_EVAL_METHOD != 0
+#endif

gcc/testsuite/gcc.target/i386/pr69225-3.c

+/* { dg-do compile} */
+/* { dg-options "-m80387 -mfpmath=387" } */
+
+#include <float.h>
+
+#if FLT_EVAL_METHOD != 2
+# error FLT_EVAL_METHOD != 2
+#endif

gcc/testsuite/gcc.target/i386/pr69225-4.c

+/* { dg-do compile} */
+/* { dg-options "-msse2 -mfancy-math-387 -mfpmath=sse" } */
+
+#include <float.h>
+
+#if FLT_EVAL_METHOD != 0
+# error FLT_EVAL_METHOD != 0
+#endif

gcc/testsuite/gcc.target/i386/pr69225-5.c

+/* { dg-do compile} */
+/* { dg-options "-msse2 -m80387 -mfpmath=sse,387" } */
+
+#include <float.h>
+
+#if FLT_EVAL_METHOD != -1
+# error FLT_EVAL_METHOD != -1
+#endif

gcc/testsuite/gcc.target/i386/pr69225-6.c

+/* { dg-do compile} */
+/* { dg-options "-mno-80387" } */
+
+#include <float.h>
+
+#if FLT_EVAL_METHOD != 0
+# error FLT_EVAL_METHOD != 0
+#endif