nios2.opt (march, mbmx, mcdx): New options.

2015-07-14  Sandra Loosemore  <sandra@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>
	    Chung-Lin Tang  <cltang@codesourcery.com>

	gcc/
	* config/nios2/nios2.opt (march, mbmx, mcdx): New options.
	* config/nios2/nios2-opts.h (enum nios2_arch_type): New enum for
	Nios II architecture level.
	* config/nios2/nios2.h (TARGET_ARCH_R2): New define.
	(TARGET_CPU_CPP_BUILTINS): Add definition of __nios2_arch__ symbol.
	(OPTION_DEFAULT_SPECS): Define.
	(ASM_SPEC): Add -march= spec strings.
	* config/nios2/nios2.c (nios2_option_override): Check for
	conflicts involving new options.
	* config.gcc (nios2*-*-*): Support --with-arch=.
	* doc/invoke.texi (Option Summary, Nios II Options): Document
	-march=, -mbmx,	and -mcdx.


Co-Authored-By: Cesar Philippidis <cesar@codesourcery.com>
Co-Authored-By: Chung-Lin Tang <cltang@codesourcery.com>

From-SVN: r225791

gcc/ChangeLog

+2015-07-14  Sandra Loosemore  <sandra@codesourcery.com>
+	    Cesar Philippidis  <cesar@codesourcery.com>
+	    Chung-Lin Tang  <cltang@codesourcery.com>
+
+	* config/nios2/nios2.opt (march, mbmx, mcdx): New options.
+	* config/nios2/nios2-opts.h (enum nios2_arch_type): New enum for
+	Nios II architecture level.
+	* config/nios2/nios2.h (TARGET_ARCH_R2): New define.
+	(TARGET_CPU_CPP_BUILTINS): Add definition of __nios2_arch__ symbol.
+	(OPTION_DEFAULT_SPECS): Define.
+	(ASM_SPEC): Add -march= spec strings.
+	* config/nios2/nios2.c (nios2_option_override): Check for
+	conflicts involving new options.
+	* config.gcc (nios2*-*-*): Support --with-arch=.
+	* doc/invoke.texi (Option Summary, Nios II Options): Document
+	-march=, -mbmx,	and -mcdx.
+
 2015-07-14  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/66626

gcc/config.gcc

@@ -4052,6 +4052,19 @@ case "${target}" in
 		esac
 		;;
 
+	nios2*-*-*)
+		supported_defaults="arch"
+			case "$with_arch" in
+			"" | r1 | r2)
+				# OK
+				;;
+			*)
+				echo "Unknown arch used in --with-arch=$with_arch" 1>&2
+				exit 1
+				;;
+			esac
+		;;
+
 	powerpc*-*-* | rs6000-*-*)
 		supported_defaults="abi cpu cpu_32 cpu_64 float tune tune_32 tune_64 advance_toolchain"
 

gcc/config/nios2/nios2-opts.h

@@ -77,5 +77,12 @@ enum nios2_ccs_code
   CCS_BUILTIN_CALL
 };
 
+/* Supported Nios II Architectures.  */
+enum nios2_arch_type
+{
+  ARCH_R1=1,
+  ARCH_R2
+};
+
 #endif
 

gcc/config/nios2/nios2.c

@@ -1078,6 +1078,19 @@ nios2_option_override (void)
   if (!TARGET_HAS_MUL && TARGET_HAS_MULX)
     target_flags &= ~MASK_HAS_MULX;
 
+  /* Optional BMX and CDX instructions only make sense for R2.  */
+  if (!TARGET_ARCH_R2)
+    {
+      if (TARGET_HAS_BMX)
+	error ("BMX instructions are only supported with R2 architecture");
+      if (TARGET_HAS_CDX)
+	error ("CDX instructions are only supported with R2 architecture");
+    }
+
+  /* R2 is little-endian only.  */
+  if (TARGET_ARCH_R2 && TARGET_BIG_ENDIAN)
+    error ("R2 architecture is little-endian only");
+
   /* Initialize default FPU configurations.  */
   nios2_init_fpu_configs ();
 

gcc/config/nios2/nios2.h

@@ -23,6 +23,9 @@
 #ifndef GCC_NIOS2_H
 #define GCC_NIOS2_H
 
+/* Indicate R2 ISA level support.  */
+#define TARGET_ARCH_R2 (nios2_arch_option == ARCH_R2)
+
 /* FPU insn codes declared here.  */
 #include "config/nios2/nios2-opts.h"
 
@@ -36,7 +39,9 @@
         builtin_define_std ("nios2_big_endian");    \
       else                                          \
         builtin_define_std ("nios2_little_endian"); \
-    }                                               \
+      builtin_define_with_int_value (		    \
+        "__nios2_arch__", (int) nios2_arch_option); \
+    }						    \
   while (0)
 
 /* We're little endian, unless otherwise specified by defining
@@ -50,14 +55,17 @@
 # define TARGET_DEFAULT (MASK_HAS_MUL | TARGET_ENDIAN_DEFAULT)
 #endif
 
+#define OPTION_DEFAULT_SPECS \
+  {"arch", "%{!march=*:%{!mcpu=*:-march=%(VALUE)}}" }
+
 #define CC1_SPEC "%{G*}"
 
 #if TARGET_ENDIAN_DEFAULT == 0
-# define ASM_SPEC "%{!meb:-EL} %{meb:-EB}"
+# define ASM_SPEC "%{!meb:-EL} %{meb:-EB} %{march=*:-march=%*}"
 # define LINK_SPEC_ENDIAN "%{!meb:-EL} %{meb:-EB}"
 # define MULTILIB_DEFAULTS { "EL" }
 #else
-# define ASM_SPEC "%{!mel:-EB} %{mel:-EL}"
+# define ASM_SPEC "%{!mel:-EB} %{mel:-EL} %{march=*:-march=%*}"
 # define LINK_SPEC_ENDIAN "%{!mel:-EB} %{mel:-EL}"
 # define MULTILIB_DEFAULTS { "EB" }
 #endif

gcc/config/nios2/nios2.opt

@@ -565,4 +565,24 @@ mcustom-round=
 Target Report RejectNegative Joined UInteger Var(nios2_custom_round) Init(-1)
 Integer id (N) of round custom instruction
 
+march=
+Target RejectNegative Joined Enum(nios2_arch_type) Var(nios2_arch_option) Init(ARCH_R1)
+Specify the name of the target architecture.
 
+Enum
+Name(nios2_arch_type) Type(enum nios2_arch_type)
+Valid Nios II ISA levels (for -march):
+
+EnumValue
+Enum(nios2_arch_type) String(r1) Value(ARCH_R1)
+
+EnumValue
+Enum(nios2_arch_type) String(r2) Value(ARCH_R2)
+
+mbmx
+Target Report Mask(HAS_BMX)
+Enable generation of R2 BMX instructions
+
+mcdx
+Target Report Mask(HAS_CDX)
+Enable generation of R2 CDX instructions

gcc/doc/invoke.texi

@@ -857,7 +857,8 @@ Objective-C and Objective-C++ Dialects}.
 -mhw-mul -mno-hw-mul -mhw-mulx -mno-hw-mulx -mno-hw-div -mhw-div @gol
 -mcustom-@var{insn}=@var{N} -mno-custom-@var{insn} @gol
 -mcustom-fpu-cfg=@var{name} @gol
--mhal -msmallc -msys-crt0=@var{name} -msys-lib=@var{name}}
+-mhal -msmallc -msys-crt0=@var{name} -msys-lib=@var{name} @gol
+-march=@var{arch} -mbmx -mno-bmx -mcdx -mno-cdx}
 
 @emph{Nvidia PTX Options}
 @gccoptlist{-m32 -m64 -mmainkernel}
@@ -18500,6 +18501,15 @@ small data section.
 Generate little-endian (default) or big-endian (experimental) code,
 respectively.
 
+@item -march=@var{arch}
+@opindex march
+This specifies the name of the target Nios II architecture.  GCC uses this
+name to determine what kind of instructions it can emit when generating
+assembly code.  Permissible names are: @samp{r1}, @samp{r2}.
+
+The preprocessor macro @code{__nios2_arch__} is available to programs,
+with value 1 or 2, indicating the targeted ISA level.
+
 @item -mbypass-cache
 @itemx -mno-bypass-cache
 @opindex mno-bypass-cache
@@ -18538,6 +18548,15 @@ Enable or disable emitting @code{mul}, @code{mulx} and @code{div} family of
 instructions by the compiler. The default is to emit @code{mul}
 and not emit @code{div} and @code{mulx}.
 
+@item -mbmx
+@itemx -mno-bmx
+@itemx -mcdx
+@itemx -mno-cdx
+Enable or disable generation of Nios II R2 BMX (bit manipulation) and
+CDX (code density) instructions.  Enabling these instructions also
+requires @option{-march=r2}.  Since these instructions are optional
+extensions to the R2 architecture, the default is not to emit them.
+
 @item -mcustom-@var{insn}=@var{N}
 @itemx -mno-custom-@var{insn}
 @opindex mcustom-@var{insn}