[gcc r12-6540] epiphany: fix -Wimplicit-fallthrough warnings in epiphany.c.

[gcc r12-6540] epiphany: fix -Wimplicit-fallthrough warnings in epiphany.c.

[Martin Liska]

https://gcc.gnu.org/g:ff496134a99de876cde331a3c12b3335c197bf52

commit r12-6540-gff496134a99de876cde331a3c12b3335c197bf52
Author: Martin Liska <mliska@suse.cz>
Date:   Wed Jan 12 10:49:54 2022 +0100

    epiphany: fix -Wimplicit-fallthrough warnings in epiphany.c.
    
    gcc/ChangeLog:
    
            * config/epiphany/epiphany.c (epiphany_mode_priority):
            Use gcc_unreachable for not handled cases.

Diff:
---
 gcc/config/epiphany/epiphany.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/config/epiphany/epiphany.c b/gcc/config/epiphany/epiphany.c
index e19e61a4dde..c9c321560de 100644
--- a/gcc/config/epiphany/epiphany.c
+++ b/gcc/config/epiphany/epiphany.c
@@ -2371,6 +2371,7 @@ epiphany_mode_priority (int entity, int priority)
 	  case 2: return (epiphany_normal_fp_rounding == FP_MODE_ROUND_NEAREST
 			  ? FP_MODE_ROUND_TRUNC : FP_MODE_ROUND_NEAREST);
 	  case 3: return FP_MODE_CALLER;
+	  default: gcc_unreachable ();
 	  }
       case FP_MODE_ROUND_NEAREST:
       case FP_MODE_CALLER:
@@ -2380,6 +2381,7 @@ epiphany_mode_priority (int entity, int priority)
 	  case 1: return FP_MODE_ROUND_TRUNC;
 	  case 2: return FP_MODE_INT;
 	  case 3: return FP_MODE_CALLER;
+	  default: gcc_unreachable ();
 	  }
       case FP_MODE_ROUND_TRUNC:
 	switch (priority)
@@ -2388,6 +2390,7 @@ epiphany_mode_priority (int entity, int priority)
 	  case 1: return FP_MODE_ROUND_NEAREST;
 	  case 2: return FP_MODE_INT;
 	  case 3: return FP_MODE_CALLER;
+	  default: gcc_unreachable ();
 	  }
       case FP_MODE_ROUND_UNKNOWN:
       case FP_MODE_NONE: