PR target/56529

	* config/sh/sh.c (sh_option_override): Check for TARGET_DYNSHIFT
	instead of TARGET_SH2 for call-table case.  Do not set sh_div_strategy
	to SH_DIV_CALL_TABLE for TARGET_SH2.
	* config.gcc (sh_multilibs): Add m2 and m2a to sh*-*-linux* multilib
	list.
	* doc/invoke.texi (SH options): Document mdiv= call-div1, call-fp,
	call-table options.

	PR target/56529
	* config/sh/lib1funcs.S (udivsi3_i4i, sdivsi3_i4i): Add __SH2A__ to
	inclusion list.



git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@196484 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 32 insertions, 2 deletions

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index a2a40660cfe..11c34d8781b 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -18749,8 +18749,8 @@ Set the cost to assume for a multiply insn.
 
 @item -mdiv=@var{strategy}
 @opindex mdiv=@var{strategy}
-Set the division strategy to use for SHmedia code.  @var{strategy} must be
-one of: 
+Set the division strategy to be used for integer division operations.
+For SHmedia @var{strategy} can be one of: 
 
 @table @samp
 
@@ -18808,6 +18808,36 @@ a small dividend to be unlikely, and @samp{inv20l} assumes it to be likely.
 
 @end table
 
+For targets other than SHmedia @var{strategy} can be one of:
+
+@table @samp
+
+@item call-div1
+Calls a library function that uses the single-step division instruction
+@code{div1} to perform the operation.  Division by zero calculates an
+unspecified result and does not trap.  This is the default except for SH4,
+SH2A and SHcompact.
+
+@item call-fp
+Calls a library function that performs the operation in double precision
+floating point.  Division by zero causes a floating-point exception.  This is
+the default for SHcompact with FPU.  Specifying this for targets that do not
+have a double precision FPU will default to @code{call-div1}.
+
+@item call-table
+Calls a library function that uses a lookup table for small divisors and
+the @code{div1} instruction with case distinction for larger divisors.  Division
+by zero calculates an unspecified result and does not trap.  This is the default
+for SH4.  Specifying this for targets that do not have dynamic shift
+instructions will default to @code{call-div1}.
+
+@end table
+
+When a division strategy has not been specified the default strategy will be
+selected based on the current target.  For SH2A the default strategy is to
+use the @code{divs} and @code{divu} instructions instead of library function
+calls.
+
 @item -maccumulate-outgoing-args
 @opindex maccumulate-outgoing-args
 Reserve space once for outgoing arguments in the function prologue rather