[gcc(refs/vendors/ibm/heads/mmaplus2)] Add -mcpu=future.
Michael Meissner
meissner@gcc.gnu.org
Tue Mar 3 22:13:17 GMT 2026
https://gcc.gnu.org/g:007b2729f1c9f734cd6a5f0fc48ef7a079265d94
commit 007b2729f1c9f734cd6a5f0fc48ef7a079265d94
Author: Michael Meissner <meissner@linux.ibm.com>
Date: Tue Mar 3 17:10:58 2026 -0500
Add -mcpu=future.
This patch adds support for the -mcpu=future option. New processor features,
that may or may not be supported in a future processor, will be supported in gcc
under this option. This option will be renamed to an actual future processor,
whenever such a processor is announced.
This is version 12 of the -mcpu=future patch.
Can I check this patch into the GCC trunk? I have built bootstrap
builds on both a little endian Power10 system and a big endian Power9
system and there were no regressions. On the little endian Power10
system, I built the last run using the --with-cpu=future configuration
option.
2026-03-03 Michael Meissner <meissner@linux.ibm.com>
gcc/
* config.gcc (powerpc*-*-*): Add support for supporting --with-cpu=future.
* config/rs6000/aix71.h (ASM_CPU_SPEC): Pass -mfuture to the assembler
if the user used the -mcpu=future option.
* config/rs6000/aix72.h (ASM_CPU_SPEC): Likewise.
* config/rs6000/aix73.h (ASM_CPU_SPEC): Likewise.
* config/rs6000/rs6000-c.cc (rs6000_target_modify_macros): Define
_ARCH_FUTURE if -mcpu=future.
* config/rs6000/rs6000-cpus.def (FUTURE_MASKS_SERVER): New macro.
(POWERPC_MASKS): Add OPTION_MASK_FUTURE.
(rs6000_cpu_opt_value): New entry for 'future' via the RS6000_CPU macro.
* config/rs6000/rs6000-opts.h (PROCESSOR_FUTURE): New macro.
* config/rs6000/rs6000-tables.opt: Regenerate.
* config/rs6000/rs6000.cc (rs6000_machine_from_flags) If -mcpu=future,
set the .machine directive to "future".
(rs6000_opt_masks): Add entry for -mfuture.
* config/rs6000/rs6000.h (ASM_CPU_SPEC): Pass -mfuture to the assembler
if the user used the -mcpu=future option.
* config/rs6000/rs6000.opt (-mfuture): New option.
* doc/invoke.texi (IBM RS/6000 and PowerPC Options): Document
-mcpu=future.
gcc/testsuite/
* gcc.target/powerpc/future-1.c: New test.
* gcc.target/powerpc/future-2.c: Likewise.
Diff:
---
gcc/config.gcc | 4 ++--
gcc/config/rs6000/aix71.h | 1 +
gcc/config/rs6000/aix72.h | 1 +
gcc/config/rs6000/aix73.h | 1 +
gcc/config/rs6000/rs6000-c.cc | 2 ++
gcc/config/rs6000/rs6000-cpus.def | 6 ++++++
gcc/config/rs6000/rs6000-opts.h | 2 ++
gcc/config/rs6000/rs6000-tables.opt | 11 +++++++----
gcc/config/rs6000/rs6000.cc | 3 +++
gcc/config/rs6000/rs6000.h | 1 +
gcc/config/rs6000/rs6000.opt | 5 +++++
gcc/doc/invoke.texi | 5 +++--
gcc/testsuite/gcc.target/powerpc/future-1.c | 13 +++++++++++++
gcc/testsuite/gcc.target/powerpc/future-2.c | 24 ++++++++++++++++++++++++
14 files changed, 71 insertions(+), 8 deletions(-)
diff --git a/gcc/config.gcc b/gcc/config.gcc
index 35958b17009c..2fe3a49bfbcb 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -553,7 +553,7 @@ powerpc*-*-*)
extra_headers="${extra_headers} ppu_intrinsics.h spu2vmx.h vec_types.h si2vmx.h"
extra_headers="${extra_headers} amo.h"
case x$with_cpu in
- xpowerpc64|xdefault64|x6[23]0|x970|xG5|xpower[3456789]|xpower1[01]|xpower6x|xrs64a|xcell|xa2|xe500mc64|xe5500|xe6500)
+ xpowerpc64|xdefault64|x6[23]0|x970|xG5|xpower[3456789]|xpower1[01]|xfuture|xpower6x|xrs64a|xcell|xa2|xe500mc64|xe5500|xe6500)
cpu_is_64bit=yes
;;
esac
@@ -5844,7 +5844,7 @@ case "${target}" in
eval "with_$which=405"
;;
"" | common | native \
- | power[3456789] | power1[01] | power5+ | power6x \
+ | power[3456789] | power1[01] | future | power5+ | power6x \
| powerpc | powerpc64 | powerpc64le \
| rs64 \
| 401 | 403 | 405 | 405fp | 440 | 440fp | 464 | 464fp \
diff --git a/gcc/config/rs6000/aix71.h b/gcc/config/rs6000/aix71.h
index 3093de62088d..2331004344f9 100644
--- a/gcc/config/rs6000/aix71.h
+++ b/gcc/config/rs6000/aix71.h
@@ -79,6 +79,7 @@ do { \
#undef ASM_CPU_SPEC
#define ASM_CPU_SPEC \
"%{mcpu=native: %(asm_cpu_native); \
+ mcpu=future: -mfuture; \
mcpu=power11: -mpwr11; \
mcpu=power10: -mpwr10; \
mcpu=power9: -mpwr9; \
diff --git a/gcc/config/rs6000/aix72.h b/gcc/config/rs6000/aix72.h
index 515eeebe5aaa..9105f4254d0e 100644
--- a/gcc/config/rs6000/aix72.h
+++ b/gcc/config/rs6000/aix72.h
@@ -79,6 +79,7 @@ do { \
#undef ASM_CPU_SPEC
#define ASM_CPU_SPEC \
"%{mcpu=native: %(asm_cpu_native); \
+ mcpu=future: -mfuture; \
mcpu=power11: -mpwr11; \
mcpu=power10: -mpwr10; \
mcpu=power9: -mpwr9; \
diff --git a/gcc/config/rs6000/aix73.h b/gcc/config/rs6000/aix73.h
index d89a4a197b37..8316decceae5 100644
--- a/gcc/config/rs6000/aix73.h
+++ b/gcc/config/rs6000/aix73.h
@@ -79,6 +79,7 @@ do { \
#undef ASM_CPU_SPEC
#define ASM_CPU_SPEC \
"%{mcpu=native: %(asm_cpu_native); \
+ mcpu=future: -mfuture; \
mcpu=power11: -mpwr11; \
mcpu=power10: -mpwr10; \
mcpu=power9: -mpwr9; \
diff --git a/gcc/config/rs6000/rs6000-c.cc b/gcc/config/rs6000/rs6000-c.cc
index 8c221b71b8d3..eb6a881aa9bd 100644
--- a/gcc/config/rs6000/rs6000-c.cc
+++ b/gcc/config/rs6000/rs6000-c.cc
@@ -437,6 +437,8 @@ rs6000_target_modify_macros (bool define_p, HOST_WIDE_INT flags)
rs6000_define_or_undefine_macro (define_p, "_ARCH_PWR10");
if ((flags & OPTION_MASK_POWER11) != 0)
rs6000_define_or_undefine_macro (define_p, "_ARCH_PWR11");
+ if ((flags & OPTION_MASK_FUTURE) != 0)
+ rs6000_define_or_undefine_macro (define_p, "_ARCH_FUTURE");
if ((flags & OPTION_MASK_SOFT_FLOAT) != 0)
rs6000_define_or_undefine_macro (define_p, "_SOFT_FLOAT");
if ((flags & OPTION_MASK_RECIP_PRECISION) != 0)
diff --git a/gcc/config/rs6000/rs6000-cpus.def b/gcc/config/rs6000/rs6000-cpus.def
index 36be338493eb..a110860acce6 100644
--- a/gcc/config/rs6000/rs6000-cpus.def
+++ b/gcc/config/rs6000/rs6000-cpus.def
@@ -83,6 +83,10 @@
#define POWER11_MASKS_SERVER (ISA_3_1_MASKS_SERVER \
| OPTION_MASK_POWER11)
+/* -mcpu=future flags. */
+#define FUTURE_MASKS_SERVER (POWER11_MASKS_SERVER \
+ | OPTION_MASK_FUTURE)
+
/* Flags that need to be turned off if -mno-vsx. */
#define OTHER_VSX_VECTOR_MASKS (OPTION_MASK_EFFICIENT_UNALIGNED_VSX \
| OPTION_MASK_FLOAT128_KEYWORD \
@@ -121,6 +125,7 @@
| OPTION_MASK_FPRND \
| OPTION_MASK_POWER10 \
| OPTION_MASK_POWER11 \
+ | OPTION_MASK_FUTURE \
| OPTION_MASK_P10_FUSION \
| OPTION_MASK_HTM \
| OPTION_MASK_ISEL \
@@ -249,6 +254,7 @@ RS6000_CPU ("power9", PROCESSOR_POWER9, MASK_POWERPC64 | ISA_3_0_MASKS_SERVER
| OPTION_MASK_HTM)
RS6000_CPU ("power10", PROCESSOR_POWER10, MASK_POWERPC64 | ISA_3_1_MASKS_SERVER)
RS6000_CPU ("power11", PROCESSOR_POWER11, MASK_POWERPC64 | POWER11_MASKS_SERVER)
+RS6000_CPU ("future", PROCESSOR_FUTURE, MASK_POWERPC64 | FUTURE_MASKS_SERVER)
RS6000_CPU ("powerpc", PROCESSOR_POWERPC, 0)
RS6000_CPU ("powerpc64", PROCESSOR_POWERPC64, OPTION_MASK_PPC_GFXOPT
| MASK_POWERPC64)
diff --git a/gcc/config/rs6000/rs6000-opts.h b/gcc/config/rs6000/rs6000-opts.h
index db308065a435..c98cdc7d5c8c 100644
--- a/gcc/config/rs6000/rs6000-opts.h
+++ b/gcc/config/rs6000/rs6000-opts.h
@@ -71,6 +71,8 @@ enum processor_type
PROCESSOR_TITAN
};
+/* Make -mtune=future use the same tuning decisions as -mtune=power11. */
+#define PROCESSOR_FUTURE PROCESSOR_POWER11
/* Types of costly dependences. */
enum rs6000_dependence_cost
diff --git a/gcc/config/rs6000/rs6000-tables.opt b/gcc/config/rs6000/rs6000-tables.opt
index 040c246c2f66..efc55260b2ae 100644
--- a/gcc/config/rs6000/rs6000-tables.opt
+++ b/gcc/config/rs6000/rs6000-tables.opt
@@ -189,14 +189,17 @@ EnumValue
Enum(rs6000_cpu_opt_value) String(power11) Value(53)
EnumValue
-Enum(rs6000_cpu_opt_value) String(powerpc) Value(54)
+Enum(rs6000_cpu_opt_value) String(future) Value(54)
EnumValue
-Enum(rs6000_cpu_opt_value) String(powerpc64) Value(55)
+Enum(rs6000_cpu_opt_value) String(powerpc) Value(55)
EnumValue
-Enum(rs6000_cpu_opt_value) String(powerpc64le) Value(56)
+Enum(rs6000_cpu_opt_value) String(powerpc64) Value(56)
EnumValue
-Enum(rs6000_cpu_opt_value) String(rs64) Value(57)
+Enum(rs6000_cpu_opt_value) String(powerpc64le) Value(57)
+
+EnumValue
+Enum(rs6000_cpu_opt_value) String(rs64) Value(58)
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index a4f60ecb58a8..a499912f7f5b 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -5913,6 +5913,8 @@ rs6000_machine_from_flags (void)
flags &= ~(OPTION_MASK_PPC_GFXOPT | OPTION_MASK_PPC_GPOPT | OPTION_MASK_ISEL
| OPTION_MASK_ALTIVEC);
+ if ((flags & (FUTURE_MASKS_SERVER & ~POWER11_MASKS_SERVER)) != 0)
+ return "future";
if ((flags & (POWER11_MASKS_SERVER & ~ISA_3_1_MASKS_SERVER)) != 0)
return "power11";
if ((flags & (ISA_3_1_MASKS_SERVER & ~ISA_3_0_MASKS_SERVER)) != 0)
@@ -24465,6 +24467,7 @@ static struct rs6000_opt_mask const rs6000_opt_masks[] =
{ "fprnd", OPTION_MASK_FPRND, false, true },
{ "power10", OPTION_MASK_POWER10, false, true },
{ "power11", OPTION_MASK_POWER11, false, false },
+ { "future", OPTION_MASK_FUTURE, false, false },
{ "hard-dfp", OPTION_MASK_DFP, false, true },
{ "htm", OPTION_MASK_HTM, false, true },
{ "isel", OPTION_MASK_ISEL, false, true },
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 2b90694cef16..2d3016db5135 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -101,6 +101,7 @@
you make changes here, make them also there. */
#define ASM_CPU_SPEC \
"%{mcpu=native: %(asm_cpu_native); \
+ mcpu=future: -mfuture; \
mcpu=power11: -mpower11; \
mcpu=power10: -mpower10; \
mcpu=power9: -mpower9; \
diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
index 2eeb45a4b71e..9f3519da77b2 100644
--- a/gcc/config/rs6000/rs6000.opt
+++ b/gcc/config/rs6000/rs6000.opt
@@ -595,6 +595,11 @@ Target Undocumented Mask(POWER10) Var(rs6000_isa_flags) WarnRemoved
mpower11
Target Undocumented Mask(POWER11) Var(rs6000_isa_flags) WarnRemoved
+;; Potential future machine
+mfuture
+Target Undocumented Mask(FUTURE) Var(rs6000_isa_flags) Warn(Do not use %<-mfuture>, use %<-mcpu=future>)
+Generate (do not generate) potential future instructions.
+
mprefixed
Target Mask(PREFIXED) Var(rs6000_isa_flags)
Generate (do not generate) prefixed memory instructions.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index fe20ae66c00b..4c5c9db763cc 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -31497,8 +31497,9 @@ Supported values for @var{cpu_type} are @samp{401}, @samp{403},
@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{power9}, @samp{power10}, @samp{power11}, @samp{powerpc}, @samp{powerpc64},
-@samp{powerpc64le}, @samp{rs64}, and @samp{native}.
+@samp{power9}, @samp{power10}, @samp{power11}, @samp{future},
+@samp{powerpc}, @samp{powerpc64}, @samp{powerpc64le}, @samp{rs64},
+and @samp{native}.
@option{-mcpu=powerpc}, @option{-mcpu=powerpc64}, and
@option{-mcpu=powerpc64le} specify pure 32-bit PowerPC (either
diff --git a/gcc/testsuite/gcc.target/powerpc/future-1.c b/gcc/testsuite/gcc.target/powerpc/future-1.c
new file mode 100644
index 000000000000..7bd8e5ddbd00
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/future-1.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-mdejagnu-cpu=future -O2" } */
+
+/* Basic check to see if the compiler supports -mcpu=future and if it defines
+ _ARCH_FUTURE. */
+
+#ifndef _ARCH_FUTURE
+#error "-mcpu=future is not supported"
+#endif
+
+void foo (void)
+{
+}
diff --git a/gcc/testsuite/gcc.target/powerpc/future-2.c b/gcc/testsuite/gcc.target/powerpc/future-2.c
new file mode 100644
index 000000000000..5552cefa3c2e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/future-2.c
@@ -0,0 +1,24 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+/* Check if we can set the future target via a target attribute. */
+
+__attribute__((__target__("cpu=power9")))
+void foo_p9 (void)
+{
+}
+
+__attribute__((__target__("cpu=power10")))
+void foo_p10 (void)
+{
+}
+
+__attribute__((__target__("cpu=power11")))
+void foo_p11 (void)
+{
+}
+
+__attribute__((__target__("cpu=future")))
+void foo_future (void)
+{
+}
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