[gcc(refs/users/marxin/heads/rs6000-ibmlongdouble)] rs6000: Fix restored rs6000_long_double_type_size.

[Martin Liska <marxin@gcc.gnu.org>]

https://gcc.gnu.org/g:1632939853fbf193f72ace3d1024a137d549fef4

commit 1632939853fbf193f72ace3d1024a137d549fef4
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Jun 1 15:39:14 2021 +0200

    rs6000: Fix restored rs6000_long_double_type_size.
    
    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.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/powerpc/pragma-optimize.c: New test.

Diff:
---
 gcc/config/rs6000/rs6000.c                         |  2 ++
 gcc/testsuite/gcc.target/powerpc/pragma-optimize.c | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 2c249e186e1..fa4aa864c00 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4185,6 +4185,8 @@ 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 can be restored with cl_target_option_restore.  */
   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..2455fb57138
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pragma-optimize.c
@@ -0,0 +1,14 @@
+/* { dg-do compile { target { powerpc*-*-* } } } */
+/* { 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;
+}