[ARM] Add missing M/R class CPUs

[bsmith]

Summary

This patch adds some of the missing M and R class Cortex CPUs, namely:

Cortex-M0+ (called Cortex-M0plus for GCC compatibility)
Cortex-M1
SC000
SC300
Cortex-R7

[rengolin]

Hi Bradley,

Do these need to be their own cores? Or could they be aliases? This will probably introduce misinformation when someone else changes "m0" but not the others for lack of information if they should...

Or maybe I'm missing the point and those cores will end up with different features in later commits.

cheers,
--renato

[bsmith]

Some of them will end up with the same feature set (the sc* CPUs for example) so maybe aliases would be best. That said, how do you do aliases and still have them targetable in LLVM? (the only way I know of is to do it at the clang side).

Unless you mean map both CPUs to the same single subtarget feature which then maps to the correct feature set? (One issue with this is that the ARM backend is getting very close to the current 64 subtarget feature limit, I'm wary of introducing more not strictly necessary ones until this is fixed).

[rengolin]

The problem is more of duplication in the table-gen file than the end results, which will end up as a very large table anyway.

Could you use a defm instead of def? So, for each model, you add all aliases. Ex. cortex-a8 has r5, r7, etc.

[bsmith]

I've had a play with using defm etc for this, and whilst it does work it ends up being rather messy and unclear (especially when applied to all CPUs). I think in an ideal world the way I would structure this would be to model architectures rather than CPUs. That is, have subtarget features that represent architectures and enable the correct set of features for each, then have the CPUs inherit their architecture + extra bits rather than a full set of features. However as I mentioned, this cannot be done yet due to almost reaching the subtarget feature limit.

I think what I would propose is to commit this as is for now (perhaps with a TODO/FIXME), and once D7065 lands revisit this and restructure the whole thing to remove this kind of duplication and better represent the targets.

[rengolin]

Hi Bradley, I agree. LGTM, thanks!

[bsmith]

Committed as 229660.

lib/Target/ARM/ARM.td

def : Processor<"arm1176jzf-s",     ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
                                                        FeatureHasSlowFPVMLx]>;
 def : Processor<"mpcorenovfp",      ARMV6Itineraries, [HasV6Ops]>;
 def : Processor<"mpcore",           ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
                                                        FeatureHasSlowFPVMLx]>;
 
 // V6M Processors.
 def : Processor<"cortex-m0",        ARMV6Itineraries, [HasV6MOps, FeatureNoARM,
                                                        FeatureDB, FeatureMClass]>;
+def : Processor<"cortex-m0plus",    ARMV6Itineraries, [HasV6MOps, FeatureNoARM,
+                                                       FeatureDB, FeatureMClass]>;
+def : Processor<"cortex-m1",        ARMV6Itineraries, [HasV6MOps, FeatureNoARM,
+                                                       FeatureDB, FeatureMClass]>;
+def : Processor<"sc000",            ARMV6Itineraries, [HasV6MOps, FeatureNoARM,
+                                                       FeatureDB, FeatureMClass]>;
 
 // V6T2 Processors.
 def : Processor<"arm1156t2-s",      ARMV6Itineraries, [HasV6T2Ops,
                                                        FeatureDSPThumb2]>;
 def : Processor<"arm1156t2f-s",     ARMV6Itineraries, [HasV6T2Ops, FeatureVFP2,
                                                        FeatureHasSlowFPVMLx,
                                                        FeatureDSPThumb2]>;
 

 
 // FIXME: R5 has currently the same ProcessorModel as A8.
 def : ProcessorModel<"cortex-r5",   CortexA8Model,
                                     [ProcR5, HasV7Ops, FeatureDB,
                                      FeatureVFP3, FeatureDSPThumb2,
                                      FeatureHasRAS, FeatureVFPOnlySP,
                                      FeatureD16, FeatureRClass]>;
 
+// FIXME: R7 has currently the same ProcessorModel as A8 and is modelled as R5.
+def : ProcessorModel<"cortex-r7",   CortexA8Model,
+                                    [ProcR5, HasV7Ops, FeatureDB,
+                                     FeatureVFP3, FeatureDSPThumb2,
+                                     FeatureHasRAS, FeatureVFPOnlySP,
+                                     FeatureD16, FeatureMP, FeatureRClass]>;
+
 // V7M Processors.
 def : ProcNoItin<"cortex-m3",       [HasV7Ops,
                                      FeatureThumb2, FeatureNoARM, FeatureDB,
                                      FeatureHWDiv, FeatureMClass]>;
+def : ProcNoItin<"sc300",           [HasV7Ops,
+                                     FeatureThumb2, FeatureNoARM, FeatureDB,
+                                     FeatureHWDiv, FeatureMClass]>;
 
 // V7EM Processors.
 def : ProcNoItin<"cortex-m4",       [HasV7Ops,
                                      FeatureThumb2, FeatureNoARM, FeatureDB,
                                      FeatureHWDiv, FeatureDSPThumb2,
                                      FeatureT2XtPk, FeatureVFP4,
                                      FeatureVFPOnlySP, FeatureD16,
                                      FeatureMClass]>;

test/CodeGen/ARM/build-attributes.ll

 ; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a17 | FileCheck %s --check-prefix=CORTEX-A17-DEFAULT
 ; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a17  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-A17-FAST
 ; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a17 -mattr=-vfp2 | FileCheck %s --check-prefix=CORTEX-A17-NOFPU
 ; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a17 -mattr=-vfp2  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-A17-NOFPU-FAST
 ; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a17 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 | FileCheck %s --check-prefix=CORTEX-M0
 ; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M0-FAST
 ; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus | FileCheck %s --check-prefix=CORTEX-M0PLUS
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M0PLUS-FAST
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1 | FileCheck %s --check-prefix=CORTEX-M1
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M1-FAST
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=sc000 | FileCheck %s --check-prefix=SC000
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=sc000  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=SC000-FAST
+; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=sc000 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m3 | FileCheck %s --check-prefix=CORTEX-M3
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m3  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M3-FAST
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m3 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
+; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=sc300 | FileCheck %s --check-prefix=SC300
+; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=sc300  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=SC300-FAST
+; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=sc300 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m4 -float-abi=soft | FileCheck %s --check-prefix=CORTEX-M4-SOFT
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m4 -float-abi=soft  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M4-SOFT-FAST
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m4 -float-abi=hard | FileCheck %s --check-prefix=CORTEX-M4-HARD
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m4 -float-abi=hard  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M4-HARD-FAST
 ; RUN: llc < %s -mtriple=thumbv7m-linux-gnueabi -mcpu=cortex-m4 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -mattr=-vfp2 | FileCheck %s --check-prefix=CORTEX-M7 --check-prefix=CORTEX-M7-SOFT
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -mattr=-vfp2  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M7-NOFPU-FAST
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -mattr=+fp-only-sp | FileCheck %s --check-prefix=CORTEX-M7 --check-prefix=CORTEX-M7-SINGLE
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -mattr=+fp-only-sp  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M7-FAST
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 | FileCheck %s --check-prefix=CORTEX-M7-DOUBLE
 ; RUN: llc < %s -mtriple=thumbv7em-linux-gnueabi -mcpu=cortex-m7 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r5 | FileCheck %s --check-prefix=CORTEX-R5
 ; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r5  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-R5-FAST
 ; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r5 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
+; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r7 | FileCheck %s --check-prefix=CORTEX-R7
+; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r7  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-R7-FAST
+; RUN: llc < %s -mtriple=armv7r-linux-gnueabi -mcpu=cortex-r7 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a53 | FileCheck %s --check-prefix=CORTEX-A53
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a53  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-A53-FAST
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a53 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a57 | FileCheck %s --check-prefix=CORTEX-A57
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a57  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-A57-FAST
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a57 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a72 | FileCheck %s --check-prefix=CORTEX-A72
 ; RUN: llc < %s -mtriple=armv8-linux-gnueabi -mcpu=cortex-a72  -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-A72-FAST

 ;; this, but the fast maths software library might and such behaviour
 ;; would match hardware support on this architecture revision if it
 ;; existed.
 ; CORTEX-M0-FAST-NOT:  .eabi_attribute 20
 ; CORTEX-M0-FAST-NOT:  .eabi_attribute 21
 ; CORTEX-M0-FAST-NOT:  .eabi_attribute 22
 ; CORTEX-M0-FAST:  .eabi_attribute 23, 1
 
+; CORTEX-M0PLUS:  .cpu cortex-m0plus
+; CORTEX-M0PLUS:  .eabi_attribute 6, 12
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 7
+; CORTEX-M0PLUS:  .eabi_attribute 8, 0
+; CORTEX-M0PLUS:  .eabi_attribute 9, 1
+; CORTEX-M0PLUS-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; CORTEX-M0PLUS:  .eabi_attribute 20, 1
+; CORTEX-M0PLUS:  .eabi_attribute 21, 1
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 22
+; CORTEX-M0PLUS:  .eabi_attribute 23, 3
+; CORTEX-M0PLUS:  .eabi_attribute 24, 1
+; CORTEX-M0PLUS:  .eabi_attribute 25, 1
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 27
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 28
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 36
+; CORTEX-M0PLUS:  .eabi_attribute 38, 1
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 42
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 44
+; CORTEX-M0PLUS-NOT:  .eabi_attribute 68
+
+; CORTEX-M0PLUS-FAST-NOT:   .eabi_attribute 19
+;; Despite the M0+ CPU having no FPU in this scenario, we chose to
+;; flush to positive zero here. There's no hardware support doing
+;; this, but the fast maths software library might and such behaviour
+;; would match hardware support on this architecture revision if it
+;; existed.
+; CORTEX-M0PLUS-FAST-NOT:  .eabi_attribute 20
+; CORTEX-M0PLUS-FAST-NOT:  .eabi_attribute 21
+; CORTEX-M0PLUS-FAST-NOT:  .eabi_attribute 22
+; CORTEX-M0PLUS-FAST:  .eabi_attribute 23, 1
+
+; CORTEX-M1:  .cpu cortex-m1
+; CORTEX-M1:  .eabi_attribute 6, 12
+; CORTEX-M1-NOT:  .eabi_attribute 7
+; CORTEX-M1:  .eabi_attribute 8, 0
+; CORTEX-M1:  .eabi_attribute 9, 1
+; CORTEX-M1-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; CORTEX-M1:  .eabi_attribute 20, 1
+; CORTEX-M1:  .eabi_attribute 21, 1
+; CORTEX-M1-NOT:  .eabi_attribute 22
+; CORTEX-M1:  .eabi_attribute 23, 3
+; CORTEX-M1:  .eabi_attribute 24, 1
+; CORTEX-M1:  .eabi_attribute 25, 1
+; CORTEX-M1-NOT:  .eabi_attribute 27
+; CORTEX-M1-NOT:  .eabi_attribute 28
+; CORTEX-M1-NOT:  .eabi_attribute 36
+; CORTEX-M1:  .eabi_attribute 38, 1
+; CORTEX-M1-NOT:  .eabi_attribute 42
+; CORTEX-M1-NOT:  .eabi_attribute 44
+; CORTEX-M1-NOT:  .eabi_attribute 68
+
+; CORTEX-M1-FAST-NOT:   .eabi_attribute 19
+;; Despite the M1 CPU having no FPU in this scenario, we chose to
+;; flush to positive zero here. There's no hardware support doing
+;; this, but the fast maths software library might and such behaviour
+;; would match hardware support on this architecture revision if it
+;; existed.
+; CORTEX-M1-FAST-NOT:  .eabi_attribute 20
+; CORTEX-M1-FAST-NOT:  .eabi_attribute 21
+; CORTEX-M1-FAST-NOT:  .eabi_attribute 22
+; CORTEX-M1-FAST:  .eabi_attribute 23, 1
+
+; SC000:  .cpu sc000
+; SC000:  .eabi_attribute 6, 12
+; SC000-NOT:  .eabi_attribute 7
+; SC000:  .eabi_attribute 8, 0
+; SC000:  .eabi_attribute 9, 1
+; SC000-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; SC000:  .eabi_attribute 20, 1
+; SC000:  .eabi_attribute 21, 1
+; SC000-NOT:  .eabi_attribute 22
+; SC000:  .eabi_attribute 23, 3
+; SC000:  .eabi_attribute 24, 1
+; SC000:  .eabi_attribute 25, 1
+; SC000-NOT:  .eabi_attribute 27
+; SC000-NOT:  .eabi_attribute 28
+; SC000-NOT:  .eabi_attribute 36
+; SC000:  .eabi_attribute 38, 1
+; SC000-NOT:  .eabi_attribute 42
+; SC000-NOT:  .eabi_attribute 44
+; SC000-NOT:  .eabi_attribute 68
+
+; SC000-FAST-NOT:   .eabi_attribute 19
+;; Despite the SC000 CPU having no FPU in this scenario, we chose to
+;; flush to positive zero here. There's no hardware support doing
+;; this, but the fast maths software library might and such behaviour
+;; would match hardware support on this architecture revision if it
+;; existed.
+; SC000-FAST-NOT:  .eabi_attribute 20
+; SC000-FAST-NOT:  .eabi_attribute 21
+; SC000-FAST-NOT:  .eabi_attribute 22
+; SC000-FAST:  .eabi_attribute 23, 1
+
 ; CORTEX-M3:  .cpu cortex-m3
 ; CORTEX-M3:  .eabi_attribute 6, 10
 ; CORTEX-M3:  .eabi_attribute 7, 77
 ; CORTEX-M3:  .eabi_attribute 8, 0
 ; CORTEX-M3:  .eabi_attribute 9, 2
 ; CORTEX-M3-NOT:   .eabi_attribute 19
 ;; We default to IEEE 754 compliance
 ; CORTEX-M3:  .eabi_attribute 20, 1

 ;; Despite there being no FPU, we chose to flush to zero preserving
 ;; sign. This matches what the hardware would do for this architecture
 ;; revision.
 ; CORTEX-M3-FAST:  .eabi_attribute 20, 2
 ; CORTEX-M3-FAST-NOT:  .eabi_attribute 21
 ; CORTEX-M3-FAST-NOT:  .eabi_attribute 22
 ; CORTEX-M3-FAST:  .eabi_attribute 23, 1
 
+; SC300:  .cpu sc300
+; SC300:  .eabi_attribute 6, 10
+; SC300:  .eabi_attribute 7, 77
+; SC300:  .eabi_attribute 8, 0
+; SC300:  .eabi_attribute 9, 2
+; SC300-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; SC300:  .eabi_attribute 20, 1
+; SC300:  .eabi_attribute 21, 1
+; SC300-NOT:  .eabi_attribute 22
+; SC300:  .eabi_attribute 23, 3
+; SC300:  .eabi_attribute 24, 1
+; SC300:  .eabi_attribute 25, 1
+; SC300-NOT:  .eabi_attribute 27
+; SC300-NOT:  .eabi_attribute 28
+; SC300-NOT:  .eabi_attribute 36
+; SC300:  .eabi_attribute 38, 1
+; SC300-NOT:  .eabi_attribute 42
+; SC300-NOT:  .eabi_attribute 44
+; SC300-NOT:  .eabi_attribute 68
+
+; SC300-FAST-NOT:   .eabi_attribute 19
+;; Despite there being no FPU, we chose to flush to zero preserving
+;; sign. This matches what the hardware would do for this architecture
+;; revision.
+; SC300-FAST:  .eabi_attribute 20, 2
+; SC300-FAST-NOT:  .eabi_attribute 21
+; SC300-FAST-NOT:  .eabi_attribute 22
+; SC300-FAST:  .eabi_attribute 23, 1
+
 ; CORTEX-M4-SOFT:  .cpu cortex-m4
 ; CORTEX-M4-SOFT:  .eabi_attribute 6, 13
 ; CORTEX-M4-SOFT:  .eabi_attribute 7, 77
 ; CORTEX-M4-SOFT:  .eabi_attribute 8, 0
 ; CORTEX-M4-SOFT:  .eabi_attribute 9, 2
 ; CORTEX-M4-SOFT:  .fpu vfpv4-d16
 ; CORTEX-M4-SOFT-NOT:   .eabi_attribute 19
 ;; We default to IEEE 754 compliance

 
 ; CORTEX-R5-FAST-NOT:   .eabi_attribute 19
 ;; The R5 has the VFPv3 FP unit, which always flushes preserving sign.
 ; CORTEX-R5-FAST:  .eabi_attribute 20, 2
 ; CORTEX-R5-FAST-NOT:  .eabi_attribute 21
 ; CORTEX-R5-FAST-NOT:  .eabi_attribute 22
 ; CORTEX-R5-FAST:  .eabi_attribute 23, 1
 
+; CORTEX-R7:  .cpu cortex-r7
+; CORTEX-R7:  .eabi_attribute 6, 10
+; CORTEX-R7:  .eabi_attribute 7, 82
+; CORTEX-R7:  .eabi_attribute 8, 1
+; CORTEX-R7:  .eabi_attribute 9, 2
+; CORTEX-R7:  .fpu vfpv3-d16
+; CORTEX-R7-NOT:   .eabi_attribute 19
+;; We default to IEEE 754 compliance
+; CORTEX-R7:  .eabi_attribute 20, 1
+; CORTEX-R7:  .eabi_attribute 21, 1
+; CORTEX-R7-NOT:  .eabi_attribute 22
+; CORTEX-R7:  .eabi_attribute 23, 3
+; CORTEX-R7:  .eabi_attribute 24, 1
+; CORTEX-R7:  .eabi_attribute 25, 1
+; CORTEX-R7:  .eabi_attribute 27, 1
+; CORTEX-R7-NOT:  .eabi_attribute 28
+; CORTEX-R7-NOT:  .eabi_attribute 36
+; CORTEX-R7:  .eabi_attribute 38, 1
+; CORTEX-R7:  .eabi_attribute 42, 1
+; CORTEX-R7:  .eabi_attribute 44, 2
+; CORTEX-R7-NOT:  .eabi_attribute 68
+
+; CORTEX-R7-FAST-NOT:   .eabi_attribute 19
+;; The R7 has the VFPv3 FP unit, which always flushes preserving sign.
+; CORTEX-R7-FAST:  .eabi_attribute 20, 2
+; CORTEX-R7-FAST-NOT:  .eabi_attribute 21
+; CORTEX-R7-FAST-NOT:  .eabi_attribute 22
+; CORTEX-R7-FAST:  .eabi_attribute 23, 1
+
 ; CORTEX-A53:  .cpu cortex-a53
 ; CORTEX-A53:  .eabi_attribute 6, 14
 ; CORTEX-A53:  .eabi_attribute 7, 65
 ; CORTEX-A53:  .eabi_attribute 8, 1
 ; CORTEX-A53:  .eabi_attribute 9, 2
 ; CORTEX-A53:  .fpu crypto-neon-fp-armv8
 ; CORTEX-A53:  .eabi_attribute 12, 3
 ; CORTEX-A53-NOT:   .eabi_attribute 19