[NFC][ARM] Split SIMD identifier away from MVE

Previously, the use of MVE or MVE.FP would be defined
by using the `ARM::AEK_SIMD` identifier. SIMD relates to
the Cortex-A and Cortex-R extension that enables NEON
instructions, which is called MVE for Cortex-M. To enable the
linking of `+simd` and `+nosimd` to `+neon` and `-neon`
when using clang, MVE and MVE.FP can now be defined
using a unique enum identifier, rather than using the existing
identifier for SIMD.

This was originally planned to be merged as part of #130296 but
the changes made `+nosimd` an invalid argument, which, while not
having any functionality, was allowed in previous versions of
LLVM. To avoid regressions being introduced, this has been
combined with the fix for `+nosimd` on AArch32.

Author: Stylie777

llvm/include/llvm/TargetParser/ARMTargetParser.def

@@ -224,8 +224,8 @@ ARM_ARCH_EXT_NAME("dotprod", ARM::AEK_DOTPROD, "+dotprod", "-dotprod")
 ARM_ARCH_EXT_NAME("dsp", ARM::AEK_DSP, "+dsp", "-dsp")
 ARM_ARCH_EXT_NAME("fp", ARM::AEK_FP, {}, {})
 ARM_ARCH_EXT_NAME("fp.dp", ARM::AEK_FP_DP, {}, {})
-ARM_ARCH_EXT_NAME("mve", (ARM::AEK_DSP | ARM::AEK_SIMD), "+mve", "-mve")
-ARM_ARCH_EXT_NAME("mve.fp", (ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP),
+ARM_ARCH_EXT_NAME("mve", (ARM::AEK_DSP | ARM::AEK_MVE), "+mve", "-mve")
+ARM_ARCH_EXT_NAME("mve.fp", (ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP),
                   "+mve.fp", "-mve.fp")
 ARM_ARCH_EXT_NAME("idiv", (ARM::AEK_HWDIVARM | ARM::AEK_HWDIVTHUMB), {}, {})
 ARM_ARCH_EXT_NAME("mp", ARM::AEK_MP, {}, {})
@@ -345,12 +345,12 @@ ARM_CPU_NAME("cortex-m33", ARMV8MMainline, FK_FPV5_SP_D16, false, ARM::AEK_DSP)
 ARM_CPU_NAME("star-mc1", ARMV8MMainline, FK_FPV5_SP_D16, false, ARM::AEK_DSP)
 ARM_CPU_NAME("cortex-m35p", ARMV8MMainline, FK_FPV5_SP_D16, false, ARM::AEK_DSP)
 ARM_CPU_NAME("cortex-m55", ARMV8_1MMainline, FK_FP_ARMV8_FULLFP16_D16, false,
-             (ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP | ARM::AEK_FP16))
+             (ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP | ARM::AEK_FP16))
 ARM_CPU_NAME("cortex-m85", ARMV8_1MMainline, FK_FP_ARMV8_FULLFP16_D16, false,
-             (ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP | ARM::AEK_FP16 |
+             (ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP | ARM::AEK_FP16 |
               ARM::AEK_RAS | ARM::AEK_PACBTI))
 ARM_CPU_NAME("cortex-m52", ARMV8_1MMainline, FK_FP_ARMV8_FULLFP16_D16, false,
-             (ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP | ARM::AEK_FP16 |
+             (ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP | ARM::AEK_FP16 |
               ARM::AEK_RAS | ARM::AEK_PACBTI))
 ARM_CPU_NAME("cortex-a32", ARMV8A, FK_CRYPTO_NEON_FP_ARMV8, false, ARM::AEK_CRC)
 ARM_CPU_NAME("cortex-a35", ARMV8A, FK_CRYPTO_NEON_FP_ARMV8, false, ARM::AEK_CRC)

llvm/include/llvm/TargetParser/ARMTargetParser.h

@@ -61,6 +61,7 @@ enum ArchExtKind : uint64_t {
   AEK_CDECP6 = 1 << 28,
   AEK_CDECP7 = 1 << 29,
   AEK_PACBTI = 1 << 30,
+  AEK_MVE = 1ULL << 31,
   // Unsupported extensions.
   AEK_OS = 1ULL << 59,
   AEK_IWMMXT = 1ULL << 60,

llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp

@@ -12971,7 +12971,7 @@ bool ARMAsmParser::enableArchExtFeature(StringRef Name, SMLoc &ExtLoc) {
       {ARM::AEK_CRYPTO,
        {Feature_HasV8Bit},
        {ARM::FeatureCrypto, ARM::FeatureNEON, ARM::FeatureFPARMv8}},
-      {(ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP),
+      {(ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP),
        {Feature_HasV8_1MMainlineBit},
        {ARM::HasMVEFloatOps}},
       {ARM::AEK_FP,

llvm/lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp

@@ -248,7 +248,7 @@ void ARMTargetStreamer::emitTargetAttributes(const MCSubtargetInfo &STI) {
         emitFPU(STI.hasFeature(ARM::FeatureFP64) ? ARM::FK_FPV5_D16
                                                  : ARM::FK_FPV5_SP_D16);
         if (STI.hasFeature(ARM::HasMVEFloatOps))
-          emitArchExtension(ARM::AEK_SIMD | ARM::AEK_DSP | ARM::AEK_FP);
+          emitArchExtension(ARM::AEK_MVE | ARM::AEK_DSP | ARM::AEK_FP);
       }
     } else if (STI.hasFeature(ARM::FeatureVFP4_D16_SP))
       emitFPU(STI.hasFeature(ARM::FeatureD32)

llvm/unittests/TargetParser/TargetParserTest.cpp

@@ -507,17 +507,17 @@ INSTANTIATE_TEST_SUITE_P(
                                    "8-M.Mainline"),
         ARMCPUTestParams<uint64_t>(
             "cortex-m55", "armv8.1-m.main", "fp-armv8-fullfp16-d16",
-            ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP |
+            ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP |
                 ARM::AEK_RAS | ARM::AEK_LOB | ARM::AEK_FP16,
             "8.1-M.Mainline"),
         ARMCPUTestParams<uint64_t>(
             "cortex-m85", "armv8.1-m.main", "fp-armv8-fullfp16-d16",
-            ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP |
+            ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP |
                 ARM::AEK_RAS | ARM::AEK_LOB | ARM::AEK_FP16 | ARM::AEK_PACBTI,
             "8.1-M.Mainline"),
         ARMCPUTestParams<uint64_t>(
             "cortex-m52", "armv8.1-m.main", "fp-armv8-fullfp16-d16",
-            ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP |
+            ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP | ARM::AEK_MVE | ARM::AEK_FP |
                 ARM::AEK_RAS | ARM::AEK_LOB | ARM::AEK_FP16 | ARM::AEK_PACBTI,
             "8.1-M.Mainline"),
         ARMCPUTestParams<uint64_t>("iwmmxt", "iwmmxt", "none", ARM::AEK_NONE,