This patch adds support for a new PowerPC cpu (future). The intention of this patch is to provide a testing platform for features that may be added to future PowerPC server systems. However, these features are not officially part of the PowerPC architecture, and they may be changed before they are incorporated into future platforms.
If the features provided by -mcpu=future are incorporated into an official PowerPC server, this option will be renamed to the official name for that platform. The version 8 patches were here: * https://gcc.gnu.org/pipermail/gcc-patches/2025-November/700537.html In particular, this patch answers questions from Surya Kumari Jangala: * https://gcc.gnu.org/pipermail/gcc-patches/2025-November/701351.html Here are the changes I made to the V8 patch. I added a commit log message in the first patch. I changed macros to macro in the ChangeLog message. I added an entry for the cpu=future entry in rs6000-cpus.def. The entry was actually there but in the wrong place, and I rewrote the message. I simplified the ChangeLog message for PROCESSOR_FUTURE. I added a ChangeLog message for rs6000.cc. In terms of: > @@ -24463,6 +24465,7 @@ static struct rs6000_opt_mask const rs6000_opt_masks[] = > { "float128", OPTION_MASK_FLOAT128_KEYWORD, false, true }, > { "float128-hardware", OPTION_MASK_FLOAT128_HW, false, true }, > { "fprnd", OPTION_MASK_FPRND, false, true }, > + { "future", OPTION_MASK_FUTURE, false, false }, The last entry should be 'true'. And better to have this entry after the entry for Power 11, so that t will be simpler when we replace 'future' with the new future processor's name. Historically the entries were alphabetical, but I moved it to be after power11. However, I kept the last entry (valid_target) to be "false" (just like it is for "power11"). The rs6000_opt_masks table has two functions. The first function is to print out the options that are set with -mdebug=reg. That function does not check valid_target. The section function is whether the target attribute and target pragma support allows the user to change that option. If valid_target is false, it will not allow the user to set this option. I.e. if they want to enable future, they have to use cpu=future. I removed the verbage about what -mcpu=future is for in the texinfo files, but I left the line saying future is a valid -mcpu= option. 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. 2025-11-25 Michael Meissner <[email protected]> gcc/ * config.gcc (powerpc*-*-*): Add support for -mcpu=future. * config/rs6000/aix71.h (ASM_CPU_SPEC): Add support for -mcpu=future. * 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 support for showing -mfuture if the -mdebug=reg debugging option is used. * config/rs6000/rs6000.h (ASM_CPU_SPEC): Add support for -mcpu=future. * 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. --- 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 | 3 +++ gcc/config/rs6000/rs6000.cc | 3 +++ gcc/config/rs6000/rs6000.h | 1 + gcc/config/rs6000/rs6000.opt | 5 +++++ gcc/doc/invoke.texi | 2 +- gcc/testsuite/gcc.target/powerpc/future-1.c | 13 +++++++++++ gcc/testsuite/gcc.target/powerpc/future-2.c | 24 +++++++++++++++++++++ 14 files changed, 65 insertions(+), 3 deletions(-) create mode 100644 gcc/testsuite/gcc.target/powerpc/future-1.c create mode 100644 gcc/testsuite/gcc.target/powerpc/future-2.c diff --git a/gcc/config.gcc b/gcc/config.gcc index 0947d6317de..c83d8126006 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -543,7 +543,7 @@ powerpc*-*-*) extra_headers="${extra_headers} ppu_intrinsics.h spu2vmx.h vec_types.h si2vmx.h" extra_headers="${extra_headers} amo.h" case x$with_cpu in - xpowerpc64|xdefault64|x6[23]0|x970|xG5|xpower[3456789]|xpower1[01]|xpower6x|xrs64a|xcell|xa2|xe500mc64|xe5500|xe6500) + xpowerpc64|xdefault64|x6[23]0|x970|xG5|xpower[3456789]|xpower1[01]|xpower6x|xrs64a|xcell|xa2|xe500mc64|xe5500|xe6500|xfuture) cpu_is_64bit=yes ;; esac @@ -5748,7 +5748,7 @@ case "${target}" in tm_defines="${tm_defines} CONFIG_PPC405CR" eval "with_$which=405" ;; - "" | common | native \ + "" | common | native | future \ | power[3456789] | power1[01] | power5+ | power6x \ | powerpc | powerpc64 | powerpc64le \ | rs64 \ diff --git a/gcc/config/rs6000/aix71.h b/gcc/config/rs6000/aix71.h index 2b21dd7cd1e..77651f5ea30 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 53c0bde5ad4..652f60c7f49 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 c7639368a26..3c66ac1d917 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 d3b0a566821..6757a2477ad 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 4a1037616d7..18547d82811 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 \ @@ -119,6 +123,7 @@ | OPTION_MASK_FLOAT128_HW \ | OPTION_MASK_FLOAT128_KEYWORD \ | OPTION_MASK_FPRND \ + | OPTION_MASK_FUTURE \ | OPTION_MASK_POWER10 \ | OPTION_MASK_POWER11 \ | OPTION_MASK_P10_FUSION \ @@ -255,3 +260,4 @@ RS6000_CPU ("powerpc64", PROCESSOR_POWERPC64, OPTION_MASK_PPC_GFXOPT RS6000_CPU ("powerpc64le", PROCESSOR_POWER8, MASK_POWERPC64 | ISA_2_7_MASKS_SERVER | OPTION_MASK_HTM) RS6000_CPU ("rs64", PROCESSOR_RS64A, OPTION_MASK_PPC_GFXOPT | MASK_POWERPC64) +RS6000_CPU ("future", PROCESSOR_FUTURE, MASK_POWERPC64 | FUTURE_MASKS_SERVER) diff --git a/gcc/config/rs6000/rs6000-opts.h b/gcc/config/rs6000/rs6000-opts.h index c31d2975f04..e13ba2ba527 100644 --- a/gcc/config/rs6000/rs6000-opts.h +++ b/gcc/config/rs6000/rs6000-opts.h @@ -71,6 +71,8 @@ enum processor_type PROCESSOR_TITAN }; +/* For now, just use power11 as the base processor for -mcpu=future. */ +#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 f5bbed5ea74..9e68c5a66e1 100644 --- a/gcc/config/rs6000/rs6000-tables.opt +++ b/gcc/config/rs6000/rs6000-tables.opt @@ -200,3 +200,6 @@ Enum(rs6000_cpu_opt_value) String(powerpc64le) Value(56) EnumValue Enum(rs6000_cpu_opt_value) String(rs64) Value(57) +EnumValue +Enum(rs6000_cpu_opt_value) String(future) Value(58) + diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 1d5cd25c0f0..2cf9a97f497 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 db6112a09e1..76c6cd1ab8e 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 88cf16ca581..b53d480bf54 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 b1e6d703702..b11f3963833 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -32328,7 +32328,7 @@ Supported values for @var{cpu_type} are @samp{401}, @samp{403}, @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{powerpc64le}, @samp{rs64}, @samp{future}, 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 00000000000..7bd8e5ddbd0 --- /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 00000000000..5552cefa3c2 --- /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) +{ +} -- 2.51.1 -- Michael Meissner, IBM PO Box 98, Ayer, Massachusetts, USA, 01432 email: [email protected]
