[glibc] m68k: Use M68K_SCALE_AVAILABLE on __mpn_lshift and __mpn_rshift

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=87ced255bdf2681f5bf6c89d7121e59f6f342161

commit 87ced255bdf2681f5bf6c89d7121e59f6f342161
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Aug 18 14:49:31 2023 -0300

    m68k: Use M68K_SCALE_AVAILABLE on __mpn_lshift and __mpn_rshift
    
    This patch adds a new macro, M68K_SCALE_AVAILABLE, similar to gmp
    scale_available_p (mpn/m68k/m68k-defs.m4) that expand to 1 if a
    scale factor can be used in addressing modes.  This is used
    instead of __mc68020__ for some optimization decisions.
    
    Checked on a build for m68k-linux-gnu target mc68020 and mc68040.

Diff:
---
 sysdeps/m68k/m680x0/lshift.S | 6 +++---
 sysdeps/m68k/m680x0/rshift.S | 8 ++++----
 sysdeps/m68k/m680x0/sysdep.h | 7 +++++++
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/sysdeps/m68k/m680x0/lshift.S b/sysdeps/m68k/m680x0/lshift.S
index 4240738959..74de90380b 100644
--- a/sysdeps/m68k/m680x0/lshift.S
+++ b/sysdeps/m68k/m680x0/lshift.S
@@ -57,9 +57,9 @@ ENTRY(__mpn_lshift)
 	bne	L(Lnormal)
 	cmpl	R(s_ptr),R(res_ptr)
 	bls	L(Lspecial)		/* jump if s_ptr >= res_ptr */
-#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
+#if M68K_SCALE_AVAILABLE
 	lea	MEM_INDX1(s_ptr,s_size,l,4),R(a2)
-#else /* not mc68020 */
+#else
 	movel	R(s_size),R(d0)
 	asll	#2,R(d0)
 	lea	MEM_INDX(s_ptr,d0,l),R(a2)
@@ -71,7 +71,7 @@ L(Lnormal:)
 	moveql	#32,R(d5)
 	subl	R(cnt),R(d5)
 
-#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
+#if M68K_SCALE_AVAILABLE
 	lea	MEM_INDX1(s_ptr,s_size,l,4),R(s_ptr)
 	lea	MEM_INDX1(res_ptr,s_size,l,4),R(res_ptr)
 #else /* not mc68000 */
diff --git a/sysdeps/m68k/m680x0/rshift.S b/sysdeps/m68k/m680x0/rshift.S
index d56a2b4a44..d398d0287e 100644
--- a/sysdeps/m68k/m680x0/rshift.S
+++ b/sysdeps/m68k/m680x0/rshift.S
@@ -56,9 +56,9 @@ ENTRY(__mpn_rshift)
 	bne	L(Lnormal)
 	cmpl	R(res_ptr),R(s_ptr)
 	bls	L(Lspecial)		/* jump if res_ptr >= s_ptr */
-#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
+#if M68K_SCALE_AVAILABLE
 	lea	MEM_INDX1(res_ptr,s_size,l,4),R(a2)
-#else /* not mc68020 */
+#else
 	movel	R(s_size),R(d0)
 	asll	#2,R(d0)
 	lea	MEM_INDX(res_ptr,d0,l),R(a2)
@@ -121,10 +121,10 @@ L(Lend:)
 
 	cfi_restore_state
 L(Lspecial:)
-#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
+#if M68K_SCALE_AVAILABLE
 	lea	MEM_INDX1(s_ptr,s_size,l,4),R(s_ptr)
 	lea	MEM_INDX1(res_ptr,s_size,l,4),R(res_ptr)
-#else /* not mc68000 */
+#else
 	movel	R(s_size),R(d0)
 	asll	#2,R(d0)
 	addl	R(d0),R(s_ptr)
diff --git a/sysdeps/m68k/m680x0/sysdep.h b/sysdeps/m68k/m680x0/sysdep.h
index b31e101273..bee5b3391c 100644
--- a/sysdeps/m68k/m680x0/sysdep.h
+++ b/sysdeps/m68k/m680x0/sysdep.h
@@ -37,3 +37,10 @@
   OP " " SRC "(" PC "), " DST
 
 #endif	/* __ASSEMBLER__ */
+
+# if defined __mc68020__ || defined __mc68030__ || defined __mc68040__	      \
+     || defined __mc68060__
+#  define M68K_SCALE_AVAILABLE 1
+# else
+#  define M68K_SCALE_AVAILABLE 0
+# endif