* [PATCH] PR 65138, Fix PowerPC little endian -flto bugs
@ 2015-03-02 23:56 Michael Meissner
2015-03-03 0:23 ` David Edelsohn
2015-03-03 21:23 ` [PATCH] PR 65138, Fix PowerPC little endian -flto bugs, GCC 4.9 backport Michael Meissner
0 siblings, 2 replies; 3+ messages in thread
From: Michael Meissner @ 2015-03-02 23:56 UTC (permalink / raw)
To: gcc-patches, dje.gcc
[-- Attachment #1: Type: text/plain, Size: 1326 bytes --]
This patch fixes PR 65138, which shows up when you configure a compiler on a
64-bit PowerPC little endian system without using the --with-cpu=power8
configuration option, and run tests involve -flto.
The following tests now run when I build a configuration without the
--with-cpu=power8 option:
c-c++-common/torture/vector-compare-1.c
gcc.c-torture/execute/20050604-1.c
gcc.c-torture/execute/20060420-1.c
gcc.dg/torture/pr45678-1.c
gcc.dg/torture/pr45678-2.c
gcc.dg/torture/vector-1.c
gcc.dg/torture/vector-2.c
There were no regressions in the run.
Is it ok to install in the trunk and to back port to GCC 4.9 (and GCC 4.8 if it
is still active)?
2015-03-02 Michael Meissner <meissner@linux.vnet.ibm.com>
PR 65138/target
* config/rs6000/rs6000-cpus.def (powerpc64le): Add new generic
processor type for 64-bit little endian PowerPC.
* config/rs6000/rs6000.c (rs6000_option_override_internal): If
-mdebug=reg, print TARGET_DEFAULT. Fix logic to use
TARGET_DEFAULT if there is no default cpu. Fix -mdebug=reg
printing built-in mask so it does not pass NULL pointers.
* doc/invoke.texi (IBM RS/6000 and PowerPC options): Document
-mcpu=powerpc64le.
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797
[-- Attachment #2: pr65138.patch03b --]
[-- Type: text/plain, Size: 4942 bytes --]
Index: gcc/config/rs6000/rs6000-cpus.def
===================================================================
--- gcc/config/rs6000/rs6000-cpus.def (revision 221117)
+++ gcc/config/rs6000/rs6000-cpus.def (working copy)
@@ -193,4 +193,5 @@ RS6000_CPU ("power7", PROCESSOR_POWER7,
RS6000_CPU ("power8", PROCESSOR_POWER8, MASK_POWERPC64 | ISA_2_7_MASKS_SERVER)
RS6000_CPU ("powerpc", PROCESSOR_POWERPC, 0)
RS6000_CPU ("powerpc64", PROCESSOR_POWERPC64, MASK_PPC_GFXOPT | MASK_POWERPC64)
+RS6000_CPU ("powerpc64le", PROCESSOR_POWER8, MASK_POWERPC64 | ISA_2_7_MASKS_SERVER)
RS6000_CPU ("rs64", PROCESSOR_RS64A, MASK_PPC_GFXOPT | MASK_POWERPC64)
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c (revision 221117)
+++ gcc/config/rs6000/rs6000.c (working copy)
@@ -3211,6 +3211,10 @@ rs6000_option_override_internal (bool gl
= ((global_init_p || target_option_default_node == NULL)
? NULL : TREE_TARGET_OPTION (target_option_default_node));
+ /* Print defaults. */
+ if ((TARGET_DEBUG_REG || TARGET_DEBUG_TARGET) && global_init_p)
+ rs6000_print_isa_options (stderr, 0, "TARGET_DEFAULT", TARGET_DEFAULT);
+
/* Remember the explicit arguments. */
if (global_init_p)
rs6000_isa_flags_explicit = global_options_set.x_rs6000_isa_flags;
@@ -3287,7 +3291,13 @@ rs6000_option_override_internal (bool gl
}
else
{
- const char *default_cpu = (TARGET_POWERPC64 ? "powerpc64" : "powerpc");
+ /* PowerPC 64-bit LE requires at least ISA 2.07. */
+ const char *default_cpu = ((!TARGET_POWERPC64)
+ ? "powerpc"
+ : ((BYTES_BIG_ENDIAN)
+ ? "powerpc64"
+ : "powerpc64le"));
+
rs6000_cpu_index = cpu_index = rs6000_cpu_name_lookup (default_cpu);
have_cpu = false;
}
@@ -3306,15 +3316,18 @@ rs6000_option_override_internal (bool gl
& set_masks);
}
else
- rs6000_isa_flags |= (processor_target_table[cpu_index].target_enable
- & ~rs6000_isa_flags_explicit);
-
- /* If no -mcpu=<xxx>, inherit any default options that were cleared via
- POWERPC_MASKS. Originally, TARGET_DEFAULT was used to initialize
- target_flags via the TARGET_DEFAULT_TARGET_FLAGS hook. When we switched
- to using rs6000_isa_flags, we need to do the initialization here. */
- if (!have_cpu)
- rs6000_isa_flags |= (TARGET_DEFAULT & ~rs6000_isa_flags_explicit);
+ {
+ /* If no -mcpu=<xxx>, inherit any default options that were cleared via
+ POWERPC_MASKS. Originally, TARGET_DEFAULT was used to initialize
+ target_flags via the TARGET_DEFAULT_TARGET_FLAGS hook. When we switched
+ to using rs6000_isa_flags, we need to do the initialization here.
+
+ If there is a TARGET_DEFAULT, use that. Otherwise fall back to using
+ -mcpu=powerpc, -mcpu=powerpc64, or -mcpu=powerpc64le defaults. */
+ HOST_WIDE_INT flags = ((TARGET_DEFAULT) ? TARGET_DEFAULT
+ : processor_target_table[cpu_index].target_enable);
+ rs6000_isa_flags |= (flags & ~rs6000_isa_flags_explicit);
+ }
if (rs6000_tune_index >= 0)
tune_index = rs6000_tune_index;
@@ -4214,12 +4227,8 @@ rs6000_option_override_internal (bool gl
target_flags. */
rs6000_builtin_mask = rs6000_builtin_mask_calculate ();
if (TARGET_DEBUG_BUILTIN || TARGET_DEBUG_TARGET)
- {
- fprintf (stderr,
- "new builtin mask = " HOST_WIDE_INT_PRINT_HEX ", ",
- rs6000_builtin_mask);
- rs6000_print_builtin_options (stderr, 0, NULL, rs6000_builtin_mask);
- }
+ rs6000_print_builtin_options (stderr, 0, "builtin mask",
+ rs6000_builtin_mask);
/* Initialize all of the registers. */
rs6000_init_hard_regno_mode_ok (global_init_p);
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 221117)
+++ gcc/doc/invoke.texi (working copy)
@@ -18628,12 +18628,13 @@ Supported values for @var{cpu_type} are
@samp{e6500}, @samp{ec603e}, @samp{G3}, @samp{G4}, @samp{G5},
@samp{titan}, @samp{power3}, @samp{power4}, @samp{power5}, @samp{power5+},
@samp{power6}, @samp{power6x}, @samp{power7}, @samp{power8}, @samp{powerpc},
-@samp{powerpc64}, and @samp{rs64}.
+@samp{powerpc64}, @samp{powerpc64le}, and @samp{rs64}.
-@option{-mcpu=powerpc}, and @option{-mcpu=powerpc64} specify pure 32-bit
-PowerPC and 64-bit PowerPC architecture machine
-types, with an appropriate, generic processor model assumed for
-scheduling purposes.
+@option{-mcpu=powerpc}, @option{-mcpu=powerpc64}, and
+@option{-mcpu=powerpc64le} specify pure 32-bit PowerPC (either
+endian), 64-bit big endian PowerPC and 64-bit little endian PowerPC
+architecture machine types, with an appropriate, generic processor
+model assumed for scheduling purposes.
The other options specify a specific processor. Code generated under
those options runs best on that processor, and may not run at all on
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] PR 65138, Fix PowerPC little endian -flto bugs
2015-03-02 23:56 [PATCH] PR 65138, Fix PowerPC little endian -flto bugs Michael Meissner
@ 2015-03-03 0:23 ` David Edelsohn
2015-03-03 21:23 ` [PATCH] PR 65138, Fix PowerPC little endian -flto bugs, GCC 4.9 backport Michael Meissner
1 sibling, 0 replies; 3+ messages in thread
From: David Edelsohn @ 2015-03-03 0:23 UTC (permalink / raw)
To: Michael Meissner, GCC Patches
On Mon, Mar 2, 2015 at 6:55 PM, Michael Meissner
<meissner@linux.vnet.ibm.com> wrote:
> This patch fixes PR 65138, which shows up when you configure a compiler on a
> 64-bit PowerPC little endian system without using the --with-cpu=power8
> configuration option, and run tests involve -flto.
>
> The following tests now run when I build a configuration without the
> --with-cpu=power8 option:
>
> c-c++-common/torture/vector-compare-1.c
> gcc.c-torture/execute/20050604-1.c
> gcc.c-torture/execute/20060420-1.c
> gcc.dg/torture/pr45678-1.c
> gcc.dg/torture/pr45678-2.c
> gcc.dg/torture/vector-1.c
> gcc.dg/torture/vector-2.c
>
> There were no regressions in the run.
>
> Is it ok to install in the trunk and to back port to GCC 4.9 (and GCC 4.8 if it
> is still active)?
>
> 2015-03-02 Michael Meissner <meissner@linux.vnet.ibm.com>
>
> PR 65138/target
> * config/rs6000/rs6000-cpus.def (powerpc64le): Add new generic
> processor type for 64-bit little endian PowerPC.
>
> * config/rs6000/rs6000.c (rs6000_option_override_internal): If
> -mdebug=reg, print TARGET_DEFAULT. Fix logic to use
> TARGET_DEFAULT if there is no default cpu. Fix -mdebug=reg
> printing built-in mask so it does not pass NULL pointers.
>
> * doc/invoke.texi (IBM RS/6000 and PowerPC options): Document
> -mcpu=powerpc64le.
Okay in trunk, 4.9 and 4.8.
Thanks, David
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] PR 65138, Fix PowerPC little endian -flto bugs, GCC 4.9 backport
2015-03-02 23:56 [PATCH] PR 65138, Fix PowerPC little endian -flto bugs Michael Meissner
2015-03-03 0:23 ` David Edelsohn
@ 2015-03-03 21:23 ` Michael Meissner
1 sibling, 0 replies; 3+ messages in thread
From: Michael Meissner @ 2015-03-03 21:23 UTC (permalink / raw)
To: gcc-patches, dje.gcc
[-- Attachment #1: Type: text/plain, Size: 1811 bytes --]
This is the backport of the fixes for PR 65138/target (not using --with-cpu
during configuration means that several lto tests fail on little endian 64-bit
PowerPC systems). I found in doing the patches, I also needed to apply the
changes on January 19th to properly set the TARGET_DEFAULT on 64-bit Linux
systems.
These patches passed bootstrap (for C/C++) and there were no tests that failed
due to the use of -flto. I'll check these patches in on January 4th, unless
there is an objection.
[branches/gcc-4_9-patch/gcc]
2015-03-03 Michael Meissner <meissner@linux.vnet.ibm.com>
Backport from trunk
2015-03-03 Michael Meissner <meissner@linux.vnet.ibm.com>
PR 65138/target
* config/rs6000/rs6000-cpus.def (powerpc64le): Add new generic
processor type for 64-bit little endian PowerPC.
* config/rs6000/rs6000.c (rs6000_option_override_internal): If
-mdebug=reg, print TARGET_DEFAULT. Fix logic to use
TARGET_DEFAULT if there is no default cpu. Fix -mdebug=reg
printing built-in mask so it does not pass NULL pointers.
* config/rs6000/rs6000-tables.opt: Regenerate.
* doc/invoke.texi (IBM RS/6000 and PowerPC options): Document
-mcpu=powerpc64le.
Backport from trunk
2015-01-19 David Edelsohn <dje.gcc@gmail.com>
* config/rs6000/default64.h: Include rs6000-cpus.def.
(TARGET_DEFAULT) [LITTLE_ENDIAN]: Use ISA 2.7 (POWER8).
(TARGET_DEFAULT) [BIG_ENDIAN]: Use POWER4.
* config/rs6000/driver-rs6000.c (detect_processor_aix): Add POWER7
and POWER8.
* config/rs6000/linux64.h (PROCESSOR_DEFAULT64): Always default to
POWER8.
* config/rs6000/rs6000.c (rs6000_file_start): Emit .machine
pseudo-op to specify assembler dialect.
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797
[-- Attachment #2: pr65138.patch04b --]
[-- Type: text/plain, Size: 9865 bytes --]
Index: gcc/config/rs6000/rs6000-tables.opt
===================================================================
--- gcc/config/rs6000/rs6000-tables.opt (revision 221158)
+++ gcc/config/rs6000/rs6000-tables.opt (working copy)
@@ -186,5 +186,8 @@ EnumValue
Enum(rs6000_cpu_opt_value) String(powerpc64) Value(52)
EnumValue
-Enum(rs6000_cpu_opt_value) String(rs64) Value(53)
+Enum(rs6000_cpu_opt_value) String(powerpc64le) Value(53)
+
+EnumValue
+Enum(rs6000_cpu_opt_value) String(rs64) Value(54)
Index: gcc/config/rs6000/rs6000-cpus.def
===================================================================
--- gcc/config/rs6000/rs6000-cpus.def (revision 221158)
+++ gcc/config/rs6000/rs6000-cpus.def (working copy)
@@ -1,5 +1,5 @@
/* IBM RS/6000 CPU names..
- Copyright (C) 1991-2014 Free Software Foundation, Inc.
+ Copyright (C) 1991-2015 Free Software Foundation, Inc.
Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
This file is part of GCC.
@@ -189,4 +189,5 @@ RS6000_CPU ("power7", PROCESSOR_POWER7,
RS6000_CPU ("power8", PROCESSOR_POWER8, MASK_POWERPC64 | ISA_2_7_MASKS_SERVER)
RS6000_CPU ("powerpc", PROCESSOR_POWERPC, 0)
RS6000_CPU ("powerpc64", PROCESSOR_POWERPC64, MASK_PPC_GFXOPT | MASK_POWERPC64)
+RS6000_CPU ("powerpc64le", PROCESSOR_POWER8, MASK_POWERPC64 | ISA_2_7_MASKS_SERVER)
RS6000_CPU ("rs64", PROCESSOR_RS64A, MASK_PPC_GFXOPT | MASK_POWERPC64)
Index: gcc/config/rs6000/default64.h
===================================================================
--- gcc/config/rs6000/default64.h (revision 221158)
+++ gcc/config/rs6000/default64.h (working copy)
@@ -1,6 +1,6 @@
/* Definitions of target machine for GNU compiler,
for 64 bit powerpc linux defaulting to -m64.
- Copyright (C) 2003-2014 Free Software Foundation, Inc.
+ Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of GCC.
@@ -18,10 +18,14 @@ You should have received a copy of the G
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
+#define RS6000_CPU(NAME, CPU, FLAGS)
+#include "rs6000-cpus.def"
+#undef RS6000_CPU
+
#if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
#undef TARGET_DEFAULT
-#define TARGET_DEFAULT (MASK_PPC_GFXOPT | MASK_POWERPC64 | MASK_64BIT | MASK_LITTLE_ENDIAN)
+#define TARGET_DEFAULT (ISA_2_7_MASKS_SERVER | MASK_POWERPC64 | MASK_64BIT | MASK_LITTLE_ENDIAN)
#else
#undef TARGET_DEFAULT
-#define TARGET_DEFAULT (MASK_PPC_GFXOPT | MASK_POWERPC64 | MASK_64BIT)
+#define TARGET_DEFAULT (MASK_PPC_GFXOPT | MASK_PPC_GPOPT | MASK_MFCRF | MASK_POWERPC64 | MASK_64BIT)
#endif
Index: gcc/config/rs6000/linux64.h
===================================================================
--- gcc/config/rs6000/linux64.h (revision 221158)
+++ gcc/config/rs6000/linux64.h (working copy)
@@ -1,6 +1,6 @@
/* Definitions of target machine for GNU compiler,
for 64 bit PowerPC linux.
- Copyright (C) 2000-2014 Free Software Foundation, Inc.
+ Copyright (C) 2000-2015 Free Software Foundation, Inc.
This file is part of GCC.
@@ -71,11 +71,7 @@ extern int dot_symbols;
#undef PROCESSOR_DEFAULT
#define PROCESSOR_DEFAULT PROCESSOR_POWER7
#undef PROCESSOR_DEFAULT64
-#ifdef LINUX64_DEFAULT_ABI_ELFv2
#define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
-#else
-#define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
-#endif
/* We don't need to generate entries in .fixup, except when
-mrelocatable or -mrelocatable-lib is given. */
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c (revision 221158)
+++ gcc/config/rs6000/rs6000.c (working copy)
@@ -1,5 +1,5 @@
/* Subroutines used for code generation on IBM RS/6000.
- Copyright (C) 1991-2014 Free Software Foundation, Inc.
+ Copyright (C) 1991-2015 Free Software Foundation, Inc.
Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
This file is part of GCC.
@@ -3100,6 +3100,10 @@ rs6000_option_override_internal (bool gl
= ((global_init_p || target_option_default_node == NULL)
? NULL : TREE_TARGET_OPTION (target_option_default_node));
+ /* Print defaults. */
+ if ((TARGET_DEBUG_REG || TARGET_DEBUG_TARGET) && global_init_p)
+ rs6000_print_isa_options (stderr, 0, "TARGET_DEFAULT", TARGET_DEFAULT);
+
/* Remember the explicit arguments. */
if (global_init_p)
rs6000_isa_flags_explicit = global_options_set.x_rs6000_isa_flags;
@@ -3176,7 +3180,13 @@ rs6000_option_override_internal (bool gl
}
else
{
- const char *default_cpu = (TARGET_POWERPC64 ? "powerpc64" : "powerpc");
+ /* PowerPC 64-bit LE requires at least ISA 2.07. */
+ const char *default_cpu = ((!TARGET_POWERPC64)
+ ? "powerpc"
+ : ((BYTES_BIG_ENDIAN)
+ ? "powerpc64"
+ : "powerpc64le"));
+
rs6000_cpu_index = cpu_index = rs6000_cpu_name_lookup (default_cpu);
have_cpu = false;
}
@@ -3195,15 +3205,18 @@ rs6000_option_override_internal (bool gl
& set_masks);
}
else
- rs6000_isa_flags |= (processor_target_table[cpu_index].target_enable
- & ~rs6000_isa_flags_explicit);
-
- /* If no -mcpu=<xxx>, inherit any default options that were cleared via
- POWERPC_MASKS. Originally, TARGET_DEFAULT was used to initialize
- target_flags via the TARGET_DEFAULT_TARGET_FLAGS hook. When we switched
- to using rs6000_isa_flags, we need to do the initialization here. */
- if (!have_cpu)
- rs6000_isa_flags |= (TARGET_DEFAULT & ~rs6000_isa_flags_explicit);
+ {
+ /* If no -mcpu=<xxx>, inherit any default options that were cleared via
+ POWERPC_MASKS. Originally, TARGET_DEFAULT was used to initialize
+ target_flags via the TARGET_DEFAULT_TARGET_FLAGS hook. When we switched
+ to using rs6000_isa_flags, we need to do the initialization here.
+
+ If there is a TARGET_DEFAULT, use that. Otherwise fall back to using
+ -mcpu=powerpc, -mcpu=powerpc64, or -mcpu=powerpc64le defaults. */
+ HOST_WIDE_INT flags = ((TARGET_DEFAULT) ? TARGET_DEFAULT
+ : processor_target_table[cpu_index].target_enable);
+ rs6000_isa_flags |= (flags & ~rs6000_isa_flags_explicit);
+ }
if (rs6000_tune_index >= 0)
tune_index = rs6000_tune_index;
@@ -4055,12 +4068,8 @@ rs6000_option_override_internal (bool gl
target_flags. */
rs6000_builtin_mask = rs6000_builtin_mask_calculate ();
if (TARGET_DEBUG_BUILTIN || TARGET_DEBUG_TARGET)
- {
- fprintf (stderr,
- "new builtin mask = " HOST_WIDE_INT_PRINT_HEX ", ",
- rs6000_builtin_mask);
- rs6000_print_builtin_options (stderr, 0, NULL, rs6000_builtin_mask);
- }
+ rs6000_print_builtin_options (stderr, 0, "builtin mask",
+ rs6000_builtin_mask);
/* Initialize all of the registers. */
rs6000_init_hard_regno_mode_ok (global_init_p);
@@ -4930,6 +4939,28 @@ rs6000_file_start (void)
switch_to_section (toc_section);
switch_to_section (text_section);
}
+
+#ifdef USING_ELFOS_H
+ if (rs6000_default_cpu == 0 || rs6000_default_cpu[0] == '\0'
+ || !global_options_set.x_rs6000_cpu_index)
+ {
+ fputs ("\t.machine ", asm_out_file);
+ if ((rs6000_isa_flags & OPTION_MASK_DIRECT_MOVE) != 0)
+ fputs ("power8\n", asm_out_file);
+ else if ((rs6000_isa_flags & OPTION_MASK_POPCNTD) != 0)
+ fputs ("power7\n", asm_out_file);
+ else if ((rs6000_isa_flags & OPTION_MASK_CMPB) != 0)
+ fputs ("power6\n", asm_out_file);
+ else if ((rs6000_isa_flags & OPTION_MASK_POPCNTB) != 0)
+ fputs ("power5\n", asm_out_file);
+ else if ((rs6000_isa_flags & OPTION_MASK_MFCRF) != 0)
+ fputs ("power4\n", asm_out_file);
+ else if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) != 0)
+ fputs ("ppc64\n", asm_out_file);
+ else
+ fputs ("ppc\n", asm_out_file);
+ }
+#endif
}
\f
Index: gcc/config/rs6000/driver-rs6000.c
===================================================================
--- gcc/config/rs6000/driver-rs6000.c (revision 221158)
+++ gcc/config/rs6000/driver-rs6000.c (working copy)
@@ -1,5 +1,5 @@
/* Subroutines for the gcc driver.
- Copyright (C) 2007-2014 Free Software Foundation, Inc.
+ Copyright (C) 2007-2015 Free Software Foundation, Inc.
This file is part of GCC.
@@ -327,6 +327,12 @@ detect_processor_aix (void)
case 0x4000:
return "power6";
+ case 0x8000:
+ return "power7";
+
+ case 0x10000:
+ return "power8";
+
default:
return "powerpc";
}
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 221158)
+++ gcc/doc/invoke.texi (working copy)
@@ -1,4 +1,4 @@
-@c Copyright (C) 1988-2014 Free Software Foundation, Inc.
+@c Copyright (C) 1988-2015 Free Software Foundation, Inc.
@c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi.
@@ -18961,12 +18961,13 @@ Supported values for @var{cpu_type} are
@samp{e6500}, @samp{ec603e}, @samp{G3}, @samp{G4}, @samp{G5},
@samp{titan}, @samp{power3}, @samp{power4}, @samp{power5}, @samp{power5+},
@samp{power6}, @samp{power6x}, @samp{power7}, @samp{power8}, @samp{powerpc},
-@samp{powerpc64}, and @samp{rs64}.
+@samp{powerpc64}, @samp{powerpc64le}, and @samp{rs64}.
-@option{-mcpu=powerpc}, and @option{-mcpu=powerpc64} specify pure 32-bit
-PowerPC and 64-bit PowerPC architecture machine
-types, with an appropriate, generic processor model assumed for
-scheduling purposes.
+@option{-mcpu=powerpc}, @option{-mcpu=powerpc64}, and
+@option{-mcpu=powerpc64le} specify pure 32-bit PowerPC (either
+endian), 64-bit big endian PowerPC and 64-bit little endian PowerPC
+architecture machine types, with an appropriate, generic processor
+model assumed for scheduling purposes.
The other options specify a specific processor. Code generated under
those options runs best on that processor, and may not run at all on
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-03-03 21:23 UTC | newest]
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2015-03-02 23:56 [PATCH] PR 65138, Fix PowerPC little endian -flto bugs Michael Meissner
2015-03-03 0:23 ` David Edelsohn
2015-03-03 21:23 ` [PATCH] PR 65138, Fix PowerPC little endian -flto bugs, GCC 4.9 backport Michael Meissner
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