[gcc r14-2251] MIPS: Use ISA_HAS_9BIT_DISPLACEMENT for mips16e2

[gcc r14-2251] MIPS: Use ISA_HAS_9BIT_DISPLACEMENT for mips16e2

[YunQiang Su]

https://gcc.gnu.org/g:773110dea48baed989f2b92bf2e1689cc2d87b60

commit r14-2251-g773110dea48baed989f2b92bf2e1689cc2d87b60
Author: Jie Mei <jie.mei@oss.cipunited.com>
Date:   Mon Jun 19 16:29:56 2023 +0800

    MIPS: Use ISA_HAS_9BIT_DISPLACEMENT for mips16e2
    
    The MIPS16e2 ASE has PREF, LL and SC instructions,
    they use 9 bits immediate, like mips32r6.
    The MIPS32 PRE-R6 uses 16 bits immediate.
    
    gcc/ChangeLog:
    
            * config/mips/mips.h(ISA_HAS_9BIT_DISPLACEMENT): Add clause
            for ISA_HAS_MIPS16E2.
            (ISA_HAS_SYNC): Same as above.
            (ISA_HAS_LL_SC): Same as above.

Diff:
---
 gcc/config/mips/mips.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index e09a6c60157..05ccd2061c7 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -1248,7 +1248,8 @@ struct mips_cpu_info {
 				 && !TARGET_MIPS16)
 
 /* ISA has data prefetch, LL and SC with limited 9-bit displacement.  */
-#define ISA_HAS_9BIT_DISPLACEMENT	(mips_isa_rev >= 6)
+#define ISA_HAS_9BIT_DISPLACEMENT	(mips_isa_rev >= 6		\
+					 || ISA_HAS_MIPS16E2)
 
 /* ISA has data indexed prefetch instructions.  This controls use of
    'prefx', along with TARGET_HARD_FLOAT and TARGET_DOUBLE_FLOAT.
@@ -1341,7 +1342,8 @@ struct mips_cpu_info {
 #define ISA_HAS_SYNCI (mips_isa_rev >= 2 && !TARGET_MIPS16)
 
 /* ISA includes sync.  */
-#define ISA_HAS_SYNC ((mips_isa >= MIPS_ISA_MIPS2 || TARGET_MIPS3900) && !TARGET_MIPS16)
+#define ISA_HAS_SYNC ((mips_isa >= MIPS_ISA_MIPS2 || TARGET_MIPS3900)	\
+		      && (!TARGET_MIPS16 || ISA_HAS_MIPS16E2))
 #define GENERATE_SYNC			\
   (target_flags_explicit & MASK_LLSC	\
    ? TARGET_LLSC && !TARGET_MIPS16	\
@@ -1350,7 +1352,8 @@ struct mips_cpu_info {
 /* ISA includes ll and sc.  Note that this implies ISA_HAS_SYNC
    because the expanders use both ISA_HAS_SYNC and ISA_HAS_LL_SC
    instructions.  */
-#define ISA_HAS_LL_SC (mips_isa >= MIPS_ISA_MIPS2 && !TARGET_MIPS5900 && !TARGET_MIPS16)
+#define ISA_HAS_LL_SC (mips_isa >= MIPS_ISA_MIPS2 && !TARGET_MIPS5900	\
+		       && (!TARGET_MIPS16 || ISA_HAS_MIPS16E2))
 #define GENERATE_LL_SC			\
   (target_flags_explicit & MASK_LLSC	\
    ? TARGET_LLSC && !TARGET_MIPS16	\