[PATCH] rs6000: Fix restored rs6000_long_double_type_size

[Martin Liska <mliska@suse.cz>]

As mentioned in the "Fallout: save/restore target options in handle_optimize_attribute"
thread, we need to support target option restore
of rs6000_long_double_type_size == FLOAT_PRECISION_TFmode.

gcc/ChangeLog:

	* config/rs6000/rs6000.c (rs6000_option_override_internal): When
	a target option is restored, it can have
	rs6000_long_double_type_size set to FLOAT_PRECISION_TFmode
	and error should not be emitted.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/pragma-optimize.c: New test.
---
 gcc/config/rs6000/rs6000.c                         |  2 ++
 gcc/testsuite/gcc.target/powerpc/pragma-optimize.c | 13 +++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/pragma-optimize.c

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 279f00cc648..510936a9948 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4186,6 +4186,8 @@ rs6000_option_override_internal (bool global_init_p)
       else
 	rs6000_long_double_type_size = default_long_double_size;
     }
+  else if (rs6000_long_double_type_size == FLOAT_PRECISION_TFmode)
+    ; /* The option value can be seen when cl_target_option_restore is called.  */
   else if (rs6000_long_double_type_size == 128)
     rs6000_long_double_type_size = FLOAT_PRECISION_TFmode;
   else if (global_options_set.x_rs6000_ieeequad)
diff --git a/gcc/testsuite/gcc.target/powerpc/pragma-optimize.c b/gcc/testsuite/gcc.target/powerpc/pragma-optimize.c
new file mode 100644
index 00000000000..4a86b58f27c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pragma-optimize.c
@@ -0,0 +1,13 @@
+/* { dg-options "-O2 -mlong-double-128 -mabi=ibmlongdouble" } */
+
+extern unsigned long int x;
+extern float f (float);
+extern __typeof (f) f_power8;
+extern __typeof (f) f_power9;
+extern __typeof (f) f __attribute__ ((ifunc ("f_ifunc")));
+static __attribute__ ((optimize ("-fno-stack-protector"))) __typeof (f) *
+f_ifunc (void)
+{
+  __typeof (f) *res = x ? f_power9 : f_power8;
+  return res;
+}
-- 
2.32.0