[gcc r11-6850] arm: Fix ICE with incompatible values for -mfp16-format [PR98636].

[gcc r11-6850] arm: Fix ICE with incompatible values for -mfp16-format [PR98636].

[Prathamesh Kulkarni]

https://gcc.gnu.org/g:4e3beaca15cab2de88a68d76f0aabc68e68f678a

commit r11-6850-g4e3beaca15cab2de88a68d76f0aabc68e68f678a
Author: Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
Date:   Fri Jan 22 14:14:20 2021 +0530

    arm: Fix ICE with incompatible values for -mfp16-format [PR98636].
    
    gcc/
    2021-01-22  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
    
            PR target/98636
            * optc-save-gen.awk: Add arm_fp16_format to checked_options.
    
    gcc/testsuite/
    2021-01-22  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
    
            PR target/98636
            * gcc.target/arm/pr98636.c: New test.

Diff:
---
 gcc/optc-save-gen.awk                  | 2 ++
 gcc/testsuite/gcc.target/arm/pr98636.c | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/gcc/optc-save-gen.awk b/gcc/optc-save-gen.awk
index b1f85928275..b9c7187a3b9 100644
--- a/gcc/optc-save-gen.awk
+++ b/gcc/optc-save-gen.awk
@@ -1443,6 +1443,8 @@ checked_options["unroll_only_small_loops"]++
 checked_options["TARGET_ALIGN_CALL"]++
 checked_options["TARGET_CASE_VECTOR_PC_RELATIVE"]++
 checked_options["arc_size_opt_level"]++
+# arm exceptions
+checked_options["arm_fp16_format"]++
 
 for (i = 0; i < n_opts; i++) {
 	name = var_name(flags[i]);
diff --git a/gcc/testsuite/gcc.target/arm/pr98636.c b/gcc/testsuite/gcc.target/arm/pr98636.c
new file mode 100644
index 00000000000..c4d235cb43d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pr98636.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-mfp16-format=alternative" } */
+
+#pragma GCC push_options
+# pragma GCC target ("arch=armv8.2-a+fp16") /* { dg-error "selected fp16 options are incompatible" } */
+#pragma GCC pop_options