[ARM] Add command-line options for ARMv8.2-A

[olista01]

Summary

This allows ARMv8.2-A to be targeted either by using "armv8.2a" in the
triple, or by using -march=armv8.2-a (or the alias -march=armv8.2a).

The FP16 extension can be enabled with the "+fp16" suffix to the -march
or -mcpu option. This is consistent with the AArch64 option, rather than
the usual ARM option of -mfpu. We have agreed with the team which will
be upstreaming this to GCC that we want to use this new option format
for new architecture extensions for both ARM and AArch64.

Most of the work for this was done by the TargetParser patch in llvm.

[bsmith]

lib/Driver/Tools.cpp

868–876

Now that -mcpu=generic works correctly and isn't hardcoded to ARMv8.1-A, I don't believe we need this hardcoded logic to add these features.

[olista01]

Removed obsolete logic for setting subtarget features, and fixed up v8.1-A tests to match.

Also added a missing test for predefined macros.

[olista01]

Ping?

[olista01]

Ping?

[olista01]

Ping?

[olista01]

Ping?

[t.p.northover]

Looks reasonable to me now.

Tim.

lib/Basic/Targets.cpp

StringRef getCPUAttr() const {
     case llvm::ARM::AK_ARMV7M:
       return "7M";
     case llvm::ARM::AK_ARMV7EM:
       return "7EM";
     case llvm::ARM::AK_ARMV8A:
       return "8A";
     case llvm::ARM::AK_ARMV8_1A:
       return "8_1A";
+    case llvm::ARM::AK_ARMV8_2A:
+      return "8_2A";
     }
   }
 
   StringRef getCPUProfile() const {
     switch(ArchProfile) {
     case llvm::ARM::PK_A:
       return "A";
     case llvm::ARM::PK_R:

lib/Driver/Tools.cpp

static void getARMTargetFeatures(const ToolChain &TC,
   // En/disable crc code generation.
   if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) {
     if (A->getOption().matches(options::OPT_mcrc))
       Features.push_back("+crc");
     else
       Features.push_back("-crc");
   }
 
-  if (Triple.getSubArch() == llvm::Triple::SubArchType::ARMSubArch_v8_1a) {
-    Features.insert(Features.begin(), "+v8.1a");
-  }
-
   // Look for the last occurrence of -mlong-calls or -mno-long-calls. If
   // neither options are specified, see if we are compiling for kernel/kext and
   // decide whether to pass "+long-calls" based on the OS and its version.
   if (Arg *A = Args.getLastArg(options::OPT_mlong_calls,
                                options::OPT_mno_long_calls)) {
     if (A->getOption().matches(options::OPT_mlong_calls))
       Features.push_back("+long-calls");
   } else if (KernelOrKext && (!Triple.isiOS() || Triple.isOSVersionLT(6)) &&
              !Triple.isWatchOS()) {
       Features.push_back("+long-calls");
   }
 
   // Kernel code has more strict alignment requirements.
   if (KernelOrKext)
     Features.push_back("+strict-align");
   else if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
                                     options::OPT_munaligned_access)) {

test/Driver/arm-cortex-cpus.c

 // RUN: %clang -target arm -mlittle-endian -march=armv8.1-a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target arm -march=armv8.1a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target armv8.1a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target arm -march=armv8.1-a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target arm -march=armv8.1a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target armv8.1a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target arm -march=armv8.1a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
 // RUN: %clang -mcpu=generic -target arm -mlittle-endian -march=armv8.1-a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A %s
-// CHECK-V81A: "-cc1"{{.*}} "-triple" "armv8.1a-{{.*}}" "-target-cpu" "generic" "-target-feature" "+v8.1a"
+// CHECK-V81A: "-cc1"{{.*}} "-triple" "armv8.1a-{{.*}}" "-target-cpu" "generic"
 
 // RUN: %clang -target armebv8.1a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A %s
 // RUN: %clang -target armeb -march=armebv8.1a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A %s
 // RUN: %clang -target armeb -march=armebv8.1-a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A %s
 // RUN: %clang -target armv8.1a -mbig-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A %s
 // RUN: %clang -target arm -march=armebv8.1a -mbig-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A %s
 // RUN: %clang -target arm -march=armebv8.1-a -mbig-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A %s
-// CHECK-BE-V81A: "-cc1"{{.*}} "-triple" "armebv8.1a-{{.*}}" "-target-cpu" "generic" "-target-feature" "+v8.1a"
+// CHECK-BE-V81A: "-cc1"{{.*}} "-triple" "armebv8.1a-{{.*}}" "-target-cpu" "generic"
 
 // RUN: %clang -target armv8.1a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A-THUMB %s
 // RUN: %clang -target arm -march=armv8.1a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A-THUMB %s
 // RUN: %clang -target arm -march=armv8.1-a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A-THUMB %s
 // RUN: %clang -target armv8.1a -mlittle-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A-THUMB %s
 // RUN: %clang -target arm -march=armv8.1a -mlittle-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A-THUMB %s
 // RUN: %clang -target arm -march=armv8.1-a -mlittle-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V81A-THUMB %s
-// CHECK-V81A-THUMB: "-cc1"{{.*}} "-triple" "thumbv8.1a-{{.*}}" "-target-cpu" "generic" "-target-feature" "+v8.1a"
+// CHECK-V81A-THUMB: "-cc1"{{.*}} "-triple" "thumbv8.1a-{{.*}}" "-target-cpu" "generic"
 
 // RUN: %clang -target armebv8.1a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A-THUMB %s
 // RUN: %clang -target armeb -march=armebv8.1a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A-THUMB %s
 // RUN: %clang -target armeb -march=armebv8.1-a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A-THUMB %s
 // RUN: %clang -target armv8.1a -mbig-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A-THUMB %s
 // RUN: %clang -target arm -march=armebv8.1a -mbig-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A-THUMB %s
 // RUN: %clang -target arm -march=armebv8.1-a -mbig-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V81A-THUMB %s
-// CHECK-BE-V81A-THUMB: "-cc1"{{.*}} "-triple" "thumbebv8.1a-{{.*}}" "-target-cpu" "generic" "-target-feature" "+v8.1a"
+// CHECK-BE-V81A-THUMB: "-cc1"{{.*}} "-triple" "thumbebv8.1a-{{.*}}" "-target-cpu" "generic"
+
+// RUN: %clang -target armv8.2a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// RUN: %clang -target arm -march=armv8.2a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// RUN: %clang -target arm -march=armv8.2-a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// RUN: %clang -target arm -march=armv8.2a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// RUN: %clang -target armv8.2a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// RUN: %clang -target arm -march=armv8.2a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// RUN: %clang -target arm -mlittle-endian -march=armv8.2-a -mlittle-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A %s
+// CHECK-V82A: "-cc1"{{.*}} "-triple" "armv8.2{{.*}}" "-target-cpu" "generic"
+
+// RUN: %clang -target armebv8.2a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A %s
+// RUN: %clang -target armv8.2a -mbig-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A %s
+// RUN: %clang -target armeb -march=armebv8.2a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A %s
+// RUN: %clang -target armeb -march=armebv8.2-a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A %s
+// RUN: %clang -target arm -march=armebv8.2a -mbig-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A %s
+// RUN: %clang -target arm -march=armebv8.2-a -mbig-endian -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A %s
+// CHECK-BE-V82A: "-cc1"{{.*}} "-triple" "armebv8.2{{.*}}" "-target-cpu" "generic"
+
+// RUN: %clang -target armv8.2a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A-THUMB %s
+// RUN: %clang -target arm -march=armv8.2a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A-THUMB %s
+// RUN: %clang -target arm -march=armv8.2-a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A-THUMB %s
+// RUN: %clang -target armv8.2a -mlittle-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A-THUMB %s
+// RUN: %clang -target arm -march=armv8.2a -mlittle-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A-THUMB %s
+// RUN: %clang -target arm -march=armv8.2-a -mlittle-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-V82A-THUMB %s
+// CHECK-V82A-THUMB: "-cc1"{{.*}} "-triple" "thumbv8.2a-{{.*}}" "-target-cpu" "generic"
+
+// RUN: %clang -target armebv8.2a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A-THUMB %s
+// RUN: %clang -target armeb -march=armebv8.2a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A-THUMB %s
+// RUN: %clang -target armeb -march=armebv8.2-a -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A-THUMB %s
+// RUN: %clang -target armv8.2a -mbig-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A-THUMB %s
+// RUN: %clang -target arm -march=armebv8.2a -mbig-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A-THUMB %s
+// RUN: %clang -target arm -march=armebv8.2-a -mbig-endian -mthumb -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BE-V82A-THUMB %s
+// CHECK-BE-V82A-THUMB: "-cc1"{{.*}} "-triple" "thumbebv8.2a-{{.*}}" "-target-cpu" "generic"
+
+// RUN: %clang -target armv8a -march=armv8.2-a+fp16 -### -c %s 2>&1 | FileCheck --check-prefix CHECK-V82A-FP16 %s
+// CHECK-V82A-FP16: "-cc1"{{.*}} "-triple" "armv8.2{{.*}}" "-target-cpu" "generic" {{.*}}"-target-feature" "+fullfp16"
+
+// Once we have CPUs with optional v8.2-A FP16, we will need a way to turn it
+// on and off. Cortex-A53 is a placeholder for now.
+// RUN: %clang -target armv8a -mcpu=cortex-a53+fp16 -### -c %s 2>&1 | FileCheck --check-prefix CHECK-CORTEX-A53-FP16 %s
+// RUN: %clang -target armv8a -mcpu=cortex-a53+nofp16 -### -c %s 2>&1 | FileCheck --check-prefix CHECK-CORTEX-A53-NOFP16 %s
+// CHECK-CORTEX-A53-FP16: "-cc1" {{.*}}"-target-cpu" "cortex-a53" {{.*}}"-target-feature" "+fullfp16"
+// CHECK-CORTEX-A53-NOFP16: "-cc1" {{.*}}"-target-cpu" "cortex-a53" {{.*}}"-target-feature" "-fullfp16"
 
 // ================== Check that a bogus architecture gives an error
 // RUN: %clang -target arm -march=armbogusv6 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BOGUS %s
 // CHECK-BOGUS: error: {{.*}} does not support '-march=armbogusv6' 
 // RUN: %clang -target arm---eabihf -march=armbogusv7 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BOGUS-HF %s
 // CHECK-BOGUS-HF: error: {{.*}} does not support '-march=armbogusv7' 
 // RUN: %clang -target arm -march=armv6bogus -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-BOGUS2 %s
 // CHECK-BOGUS2: error: {{.*}} does not support '-march=armv6bogus'

test/Preprocessor/arm-target-features.c

 // KRAIT-THUMB:#define __ARM_FEATURE_DSP
 // KRAIT-THUMB:#define  __ARM_VFPV4__ 1
 
 // RUN: %clang -target armv8.1a-none-none-eabi -x c -E -dM %s -o - | FileCheck --check-prefix=CHECK-V81A %s
 // CHECK-V81A: __ARM_ARCH 8
 // CHECK-V81A: __ARM_ARCH_8_1A__ 1
 // CHECK-V81A: #define __ARM_ARCH_PROFILE 'A'
 // CHECK-V81A: #define __ARM_FP 0xE
+
+// RUN: %clang -target armv8.2a-none-none-eabi -x c -E -dM %s -o - | FileCheck --check-prefix=CHECK-V82A %s
+// CHECK-V82A: __ARM_ARCH 8
+// CHECK-V82A: __ARM_ARCH_8_2A__ 1
+// CHECK-V82A: #define __ARM_ARCH_PROFILE 'A'
+// CHECK-V82A: #define __ARM_FP 0xE