arm-cores.def (generic-armv7-a): New architecture.

2011-09-09  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/arm/arm-cores.def (generic-armv7-a): New architecture.
	* config/arm/arm-tables.opt: Regenerate.
	* config/arm/arm-tune.md: Regenerate.
	* config/arm/arm.c (arm_file_start): Output .arch directive when
	user passes -mcpu=generic-*.
	(arm_issue_rate): Add genericv7a support.
	* config/arm/arm.h (EXTRA_SPECS): Add asm_cpu_spec.
	(ASM_CPU_SPEC): New define.
	* config/arm/elf.h (ASM_SPEC): Use %(asm_cpu_spec).
	* config/arm/semi.h (ASM_SPEC): Likewise.
	* doc/invoke.texi (ARM Options): Document -mcpu=generic-*
	and -mtune=generic-*.

From-SVN: r178731

9 files changed, 42 insertions, 5 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 87a114a..ce7c22c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,18 @@
+2011-09-09  Andrew Stubbs  <ams@codesourcery.com>
+
+	* config/arm/arm-cores.def (generic-armv7-a): New architecture.
+	* config/arm/arm-tables.opt: Regenerate.
+	* config/arm/arm-tune.md: Regenerate.
+	* config/arm/arm.c (arm_file_start): Output .arch directive when
+	user passes -mcpu=generic-*.
+	(arm_issue_rate): Add genericv7a support.
+	* config/arm/arm.h (EXTRA_SPECS): Add asm_cpu_spec.
+	(ASM_CPU_SPEC): New define.
+	* config/arm/elf.h (ASM_SPEC): Use %(asm_cpu_spec).
+	* config/arm/semi.h (ASM_SPEC): Likewise.
+	* doc/invoke.texi (ARM Options): Document -mcpu=generic-*
+	and -mtune=generic-*.
+
 2011-09-09  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/50328
diff --git a/gcc/config/arm/arm-cores.def b/gcc/config/arm/arm-cores.def
index 11a6ad9..742b5e80 100644
--- a/gcc/config/arm/arm-cores.def
+++ b/gcc/config/arm/arm-cores.def
@@ -124,6 +124,7 @@ ARM_CORE("mpcorenovfp",	  mpcorenovfp,	6K,				 FL_LDSCHED, 9e)
 ARM_CORE("mpcore",	  mpcore,	6K,				 FL_LDSCHED | FL_VFPV2, 9e)
 ARM_CORE("arm1156t2-s",	  arm1156t2s,	6T2,				 FL_LDSCHED, v6t2)
 ARM_CORE("arm1156t2f-s",  arm1156t2fs,  6T2,				 FL_LDSCHED | FL_VFPV2, v6t2)
+ARM_CORE("generic-armv7-a", genericv7a,	7A,				 FL_LDSCHED, cortex)
 ARM_CORE("cortex-a5",	  cortexa5,	7A,				 FL_LDSCHED, cortex_a5)
 ARM_CORE("cortex-a8",	  cortexa8,	7A,				 FL_LDSCHED, cortex)
 ARM_CORE("cortex-a9",	  cortexa9,	7A,				 FL_LDSCHED, cortex_a9)
@@ -135,3 +136,4 @@ ARM_CORE("cortex-m4",	  cortexm4,	7EM,				 FL_LDSCHED, cortex)
 ARM_CORE("cortex-m3",	  cortexm3,	7M,				 FL_LDSCHED, cortex)
 ARM_CORE("cortex-m1",	  cortexm1,	6M,				 FL_LDSCHED, cortex)
 ARM_CORE("cortex-m0",	  cortexm0,	6M,				 FL_LDSCHED, cortex)
+
diff --git a/gcc/config/arm/arm-tables.opt b/gcc/config/arm/arm-tables.opt
index 9b3ced6..d86e376 100644
--- a/gcc/config/arm/arm-tables.opt
+++ b/gcc/config/arm/arm-tables.opt
@@ -232,6 +232,9 @@ EnumValue
 Enum(processor_type) String(arm1156t2f-s) Value(arm1156t2fs)
 
 EnumValue
+Enum(processor_type) String(generic-armv7-a) Value(genericv7a)
+
+EnumValue
 Enum(processor_type) String(cortex-a5) Value(cortexa5)
 
 EnumValue
diff --git a/gcc/config/arm/arm-tune.md b/gcc/config/arm/arm-tune.md
index bd10833..4b439d0 100644
--- a/gcc/config/arm/arm-tune.md
+++ b/gcc/config/arm/arm-tune.md
@@ -1,5 +1,5 @@
 ;; -*- buffer-read-only: t -*-
 ;; Generated automatically by gentune.sh from arm-cores.def
 (define_attr "tune"
-	"arm2,arm250,arm3,arm6,arm60,arm600,arm610,arm620,arm7,arm7d,arm7di,arm70,arm700,arm700i,arm710,arm720,arm710c,arm7100,arm7500,arm7500fe,arm7m,arm7dm,arm7dmi,arm8,arm810,strongarm,strongarm110,strongarm1100,strongarm1110,fa526,fa626,arm7tdmi,arm7tdmis,arm710t,arm720t,arm740t,arm9,arm9tdmi,arm920,arm920t,arm922t,arm940t,ep9312,arm10tdmi,arm1020t,arm9e,arm946es,arm966es,arm968es,arm10e,arm1020e,arm1022e,xscale,iwmmxt,iwmmxt2,fa606te,fa626te,fmp626,fa726te,arm926ejs,arm1026ejs,arm1136js,arm1136jfs,arm1176jzs,arm1176jzfs,mpcorenovfp,mpcore,arm1156t2s,arm1156t2fs,cortexa5,cortexa8,cortexa9,cortexa15,cortexr4,cortexr4f,cortexr5,cortexm4,cortexm3,cortexm1,cortexm0"
+	"arm2,arm250,arm3,arm6,arm60,arm600,arm610,arm620,arm7,arm7d,arm7di,arm70,arm700,arm700i,arm710,arm720,arm710c,arm7100,arm7500,arm7500fe,arm7m,arm7dm,arm7dmi,arm8,arm810,strongarm,strongarm110,strongarm1100,strongarm1110,fa526,fa626,arm7tdmi,arm7tdmis,arm710t,arm720t,arm740t,arm9,arm9tdmi,arm920,arm920t,arm922t,arm940t,ep9312,arm10tdmi,arm1020t,arm9e,arm946es,arm966es,arm968es,arm10e,arm1020e,arm1022e,xscale,iwmmxt,iwmmxt2,fa606te,fa626te,fmp626,fa726te,arm926ejs,arm1026ejs,arm1136js,arm1136jfs,arm1176jzs,arm1176jzfs,mpcorenovfp,mpcore,arm1156t2s,arm1156t2fs,genericv7a,cortexa5,cortexa8,cortexa9,cortexa15,cortexr4,cortexr4f,cortexr5,cortexm4,cortexm3,cortexm1,cortexm0"
 	(const (symbol_ref "((enum attr_tune) arm_tune)")))
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index aaee3f4..7549562 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -22209,6 +22209,8 @@ arm_file_start (void)
       const char *fpu_name;
       if (arm_selected_arch)
 	asm_fprintf (asm_out_file, "\t.arch %s\n", arm_selected_arch->name);
+      else if (strncmp (arm_selected_cpu->name, "generic", 7) == 0)
+	asm_fprintf (asm_out_file, "\t.arch %s\n", arm_selected_cpu->name + 8);
       else
 	asm_fprintf (asm_out_file, "\t.cpu %s\n", arm_selected_cpu->name);
 
@@ -23733,6 +23735,7 @@ arm_issue_rate (void)
     case cortexr4:
     case cortexr4f:
     case cortexr5:
+    case genericv7a:
     case cortexa5:
     case cortexa8:
     case cortexa9:
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 0a6e6f2..1e8c29a 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -189,6 +189,7 @@ extern void (*arm_lang_output_object_attributes_hook)(void);
    Do not define this macro if it does not need to do anything.  */
 #define EXTRA_SPECS						\
   { "subtarget_cpp_spec",	SUBTARGET_CPP_SPEC },           \
+  { "asm_cpu_spec",		ASM_CPU_SPEC },			\
   SUBTARGET_EXTRA_SPECS
 
 #ifndef SUBTARGET_EXTRA_SPECS
@@ -2223,4 +2224,8 @@ extern int making_const_table;
    instruction.  */
 #define MAX_LDM_STM_OPS 4
 
+#define ASM_CPU_SPEC \
+   " %{mcpu=generic-*:-march=%*;"				\
+   "   :%{mcpu=*:-mcpu=%*} %{march=*:-march=%*}}"
+
 #endif /* ! GCC_ARM_H */
diff --git a/gcc/config/arm/elf.h b/gcc/config/arm/elf.h
index 5ce3e69..e0a0aa0 100644
--- a/gcc/config/arm/elf.h
+++ b/gcc/config/arm/elf.h
@@ -56,8 +56,7 @@
 #define ASM_SPEC "\
 %{mbig-endian:-EB} \
 %{mlittle-endian:-EL} \
-%{mcpu=*:-mcpu=%*} \
-%{march=*:-march=%*} \
+%(asm_cpu_spec) \
 %{mapcs-*:-mapcs-%*} \
 %(subtarget_asm_float_spec) \
 %{mthumb-interwork:-mthumb-interwork} \
diff --git a/gcc/config/arm/semi.h b/gcc/config/arm/semi.h
index ae8ddea..bbecece 100644
--- a/gcc/config/arm/semi.h
+++ b/gcc/config/arm/semi.h
@@ -61,8 +61,7 @@
 #define ASM_SPEC "\
 %{fpic|fpie: -k} %{fPIC|fPIE: -k} \
 %{mbig-endian:-EB} \
-%{mcpu=*:-mcpu=%*} \
-%{march=*:-march=%*} \
+%(arm_cpu_spec) \
 %{mapcs-float:-mfloat} \
 %{mfloat-abi=*} %{mfpu=*} \
 %{mthumb-interwork:-mthumb-interwork} \
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 3aa9611..957d75c 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -10329,6 +10329,10 @@ assembly code.  Permissible names are: @samp{arm2}, @samp{arm250},
 @samp{fa526}, @samp{fa626},
 @samp{fa606te}, @samp{fa626te}, @samp{fmp626}, @samp{fa726te}.
 
+@option{-mcpu=generic-@var{arch}} is also permissible, and is
+equivalent to @option{-march=@var{arch} -mtune=generic-@var{arch}}.
+See @option{-mtune} for more information.
+
 @item -mtune=@var{name}
 @opindex mtune
 This option is very similar to the @option{-mcpu=} option, except that
@@ -10340,6 +10344,13 @@ will generate based on the CPU specified by a @option{-mcpu=} option.
 For some ARM implementations better performance can be obtained by using
 this option.
 
+@option{-mtune=generic-@var{arch}} specifies that GCC should tune the
+performance for a blend of processors within architecture @var{arch}.
+The aim is to generate code that run well on the current most popular
+processors, balancing between optimizations that benefit some CPUs in the
+range, and avoiding performance pitfalls of other CPUs.  The effects of
+this option may change in future GCC versions as CPU models come and go.
+
 @item -march=@var{name}
 @opindex march
 This specifies the name of the target ARM architecture.  GCC uses this