Handle ARMv6-J as an alias, instead of fake architecture

Summary:
This follows D14577 to treat ARMv6-J as an alias for ARMv6,
instead of an architecture in its own right.

The functional change is that the default CPU when targeting ARMv6-J
changes from arm1136j-s to arm1136jf-s, which is currently used as
the default CPU for ARMv6; both are, in fact, ARMv6-J CPUs.

The J-bit (Jazelle support) is irrelevant to LLVM, and it doesn't
affect code generation, attributes, optimizations, or anything else,
apart from selecting the default CPU.

Reviewers: rengolin, logan, compnerd

Subscribers: aemerson, llvm-commits, rengolin

Differential Revision: http://reviews.llvm.org/D14755

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253675 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Artyom Skrobov

include/llvm/Support/ARMTargetParser.def

@@ -95,8 +95,6 @@ ARM_ARCH("iwmmxt2", AK_IWMMXT2, "iwmmxt2", "", ARMBuildAttrs::CPUArch::v5TE,
           FK_NONE, AEK_NONE)
 ARM_ARCH("xscale", AK_XSCALE, "xscale", "", ARMBuildAttrs::CPUArch::v5TE,
           FK_NONE, AEK_NONE)
-ARM_ARCH("armv6j", AK_ARMV6J, "6J", "v6", ARMBuildAttrs::CPUArch::v6,
-          FK_NONE, AEK_DSP)
 ARM_ARCH("armv7s", AK_ARMV7S, "7-S", "v7s", ARMBuildAttrs::CPUArch::v7,
           FK_NEON_VFPV4, AEK_DSP)
 ARM_ARCH("armv7k", AK_ARMV7K, "7-K", "v7k", ARMBuildAttrs::CPUArch::v7,
@@ -169,7 +167,9 @@ ARM_CPU_NAME("arm10e", AK_ARMV5TE, FK_NONE, false, AEK_NONE)
 ARM_CPU_NAME("arm1020e", AK_ARMV5TE, FK_NONE, false, AEK_NONE)
 ARM_CPU_NAME("arm1022e", AK_ARMV5TE, FK_NONE, true, AEK_NONE)
 ARM_CPU_NAME("arm926ej-s", AK_ARMV5TEJ, FK_NONE, true, AEK_NONE)
+ARM_CPU_NAME("arm1136j-s", AK_ARMV6, FK_NONE, false, AEK_NONE)
 ARM_CPU_NAME("arm1136jf-s", AK_ARMV6, FK_VFPV2, true, AEK_NONE)
+ARM_CPU_NAME("arm1136jz-s", AK_ARMV6, FK_NONE, false, AEK_NONE)
 ARM_CPU_NAME("arm1176j-s", AK_ARMV6K, FK_NONE, true, AEK_NONE)
 ARM_CPU_NAME("arm1176jz-s", AK_ARMV6KZ, FK_NONE, false, AEK_NONE)
 ARM_CPU_NAME("mpcore", AK_ARMV6K, FK_VFPV2, false, AEK_NONE)
@@ -211,8 +211,6 @@ ARM_CPU_NAME("cyclone", AK_ARMV8A, FK_CRYPTO_NEON_FP_ARMV8, false, AEK_CRC)
 // Non-standard Arch names.
 ARM_CPU_NAME("iwmmxt", AK_IWMMXT, FK_NONE, true, AEK_NONE)
 ARM_CPU_NAME("xscale", AK_XSCALE, FK_NONE, true, AEK_NONE)
-ARM_CPU_NAME("arm1136j-s", AK_ARMV6J, FK_NONE, true, AEK_NONE)
-ARM_CPU_NAME("arm1136jz-s", AK_ARMV6J, FK_NONE, false, AEK_NONE)
 ARM_CPU_NAME("swift", AK_ARMV7S, FK_NEON_VFPV4, true,
              (AEK_HWDIVARM | AEK_HWDIV))
 ARM_CPU_NAME("cortex-a7", AK_ARMV7K, FK_NONE, true, AEK_HWDIVARM | AEK_HWDIV)

lib/Support/TargetParser.cpp

@@ -400,6 +400,7 @@ static StringRef getArchSynonym(StringRef Arch) {
   return StringSwitch<StringRef>(Arch)
       .Case("v5", "v5t")
       .Case("v5e", "v5te")
+      .Case("v6j", "v6")
       .Case("v6hl", "v6k")
       .Cases("v6m", "v6sm", "v6s-m", "v6-m")
       .Cases("v6z", "v6zk", "v6kz")
@@ -579,7 +580,6 @@ unsigned llvm::ARM::parseArchVersion(StringRef Arch) {
   case ARM::AK_ARMV5TEJ:
     return 5;
   case ARM::AK_ARMV6:
-  case ARM::AK_ARMV6J:
   case ARM::AK_ARMV6K:
   case ARM::AK_ARMV6T2:
   case ARM::AK_ARMV6KZ:

lib/Support/Triple.cpp

@@ -496,7 +496,6 @@ static Triple::SubArchType parseSubArch(StringRef SubArchName) {
   case ARM::AK_ARMV5TEJ:
     return Triple::ARMSubArch_v5te;
   case ARM::AK_ARMV6:
-  case ARM::AK_ARMV6J:
     return Triple::ARMSubArch_v6;
   case ARM::AK_ARMV6K:
   case ARM::AK_ARMV6KZ:

lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp

@@ -710,7 +710,6 @@ void ARMTargetELFStreamer::emitArchDefaultAttributes() {
   case ARM::AK_ARMV5T:
   case ARM::AK_ARMV5TE:
   case ARM::AK_ARMV6:
-  case ARM::AK_ARMV6J:
     setAttributeItem(ARM_ISA_use, Allowed, false);
     setAttributeItem(THUMB_ISA_use, Allowed, false);
     break;

test/MC/ARM/directive-arch-armv6j.s

@@ -852,7 +852,7 @@ TEST(TripleTest, getARMCPUForArch) {
   }
   {
     llvm::Triple Triple("armv6j-unknown-eabi");
-    EXPECT_EQ("arm1136j-s", Triple.getARMCPUForArch());
+    EXPECT_EQ("arm1136jf-s", Triple.getARMCPUForArch());
   }
   {
     llvm::Triple Triple("armv6k-unknown-eabi");