[gcc r13-4902] gcc: xtensa: use define_c_enums instead of define_constants

[gcc r13-4902] gcc: xtensa: use define_c_enums instead of define_constants

[Max Filippov]

https://gcc.gnu.org/g:b92f1c2dcc7b79467662321615f6eafb0c441c7d

commit r13-4902-gb92f1c2dcc7b79467662321615f6eafb0c441c7d
Author: Max Filippov <jcmvbkbc@gmail.com>
Date:   Fri Dec 23 12:17:09 2022 -0800

    gcc: xtensa: use define_c_enums instead of define_constants
    
    This improves RTL dumps readability. No functional changes.
    
    gcc/
            * config/xtensa/xtensa.md (unspec): Extract UNSPEC_* constants
            into this enum.
            (unspecv): Extract UNSPECV_* constants into this enum.

Diff:
---
 gcc/config/xtensa/xtensa.md | 46 ++++++++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 21 deletions(-)

diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index e72fd9ac3f6..0a26d3dccf4 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -25,28 +25,32 @@
   (A7_REG		7)
   (A8_REG		8)
   (A9_REG		9)
+])
+
+(define_c_enum "unspec" [
+  UNSPEC_NOP
+  UNSPEC_PLT
+  UNSPEC_RET_ADDR
+  UNSPEC_TPOFF
+  UNSPEC_DTPOFF
+  UNSPEC_TLS_FUNC
+  UNSPEC_TLS_ARG
+  UNSPEC_TLS_CALL
+  UNSPEC_TP
+  UNSPEC_MEMW
+  UNSPEC_LSETUP_START
+  UNSPEC_LSETUP_END
+  UNSPEC_FRAME_BLOCKAGE
+])
 
-  (UNSPEC_NOP		2)
-  (UNSPEC_PLT		3)
-  (UNSPEC_RET_ADDR	4)
-  (UNSPEC_TPOFF		5)
-  (UNSPEC_DTPOFF	6)
-  (UNSPEC_TLS_FUNC	7)
-  (UNSPEC_TLS_ARG	8)
-  (UNSPEC_TLS_CALL	9)
-  (UNSPEC_TP		10)
-  (UNSPEC_MEMW		11)
-  (UNSPEC_LSETUP_START  12)
-  (UNSPEC_LSETUP_END    13)
-  (UNSPEC_FRAME_BLOCKAGE 14)
-
-  (UNSPECV_SET_FP	1)
-  (UNSPECV_ENTRY	2)
-  (UNSPECV_S32RI	4)
-  (UNSPECV_S32C1I	5)
-  (UNSPECV_EH_RETURN	6)
-  (UNSPECV_SET_TP	7)
-  (UNSPECV_BLOCKAGE	8)
+(define_c_enum "unspecv" [
+  UNSPECV_SET_FP
+  UNSPECV_ENTRY
+  UNSPECV_S32RI
+  UNSPECV_S32C1I
+  UNSPECV_EH_RETURN
+  UNSPECV_SET_TP
+  UNSPECV_BLOCKAGE
 ])
 
 ;; This code iterator allows signed and unsigned widening multiplications