CRC instructions are enabled by default on ARMv8.
+.. option:: -mgeneral_regs_only
+
+ Generate code which only uses the general purpose registers.
+
+ This option restricts the generated code to use general registers
+ only. This only applies to the AArch64 architecture.
+
Controlling Size of Debug Information
-------------------------------------
def m_x86_Features_Group : OptionGroup<"<m x86 features group>">, Group<m_Group>;
def m_hexagon_Features_Group : OptionGroup<"<m hexagon features group>">, Group<m_Group>;
def m_arm_Features_Group : OptionGroup<"<m arm features group>">, Group<m_Group>;
+def m_aarch64_Features_Group : OptionGroup<"<m aarch64 features group>">, Group<m_Group>;
def m_ppc_Features_Group : OptionGroup<"<m ppc features group>">, Group<m_Group>;
def u_Group : OptionGroup<"<u group>">;
def mnocrc : Flag<["-"], "mnocrc">, Group<m_arm_Features_Group>,
HelpText<"Disallow use of CRC instructions (ARM only)">;
+def mgeneral_regs_only : Flag<["-"], "mgeneral_regs_only">, Group<m_aarch64_Features_Group>,
+ HelpText<"Generate code which only uses the general purpose registers (AArch64 only)">;
+
def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;
Features.push_back("+crypto");
} else if (FPU == "neon") {
Features.push_back("+neon");
- } else if (FPU == "none") {
- Features.push_back("-fp-armv8");
- Features.push_back("-crypto");
- Features.push_back("-neon");
} else
D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
// Honor -mfpu=.
if (const Arg *A = Args.getLastArg(options::OPT_mfpu_EQ))
getAArch64FPUFeatures(D, A, Args, Features);
+
+ if (Args.getLastArg(options::OPT_mgeneral_regs_only)) {
+ Features.push_back("-fp-armv8");
+ Features.push_back("-crypto");
+ Features.push_back("-neon");
+ }
}
static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,
// CHECK-CRYPTO-NEON-FP-ARMV8: "-target-feature" "+neon"
// CHECK-CRYPTO-NEON-FP-ARMV8: "-target-feature" "+crypto"
-// RUN: %clang -target aarch64-linux-eabi -mfpu=none %s -### 2>&1 \
-// RUN: | FileCheck --check-prefix=CHECK-NO-FP %s
-// CHECK-NO-FP: "-target-feature" "-fp-armv8"
-// CHECK-NO-FP: "-target-feature" "-crypto"
-// CHECK-NO-FP: "-target-feature" "-neon"
--- /dev/null
+// Test the -mgeneral_regs_only option
+
+// RUN: %clang -target aarch64-linux-eabi -mgeneral_regs_only %s -### 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NO-FP %s
+// CHECK-NO-FP: "-target-feature" "-fp-armv8"
+// CHECK-NO-FP: "-target-feature" "-crypto"
+// CHECK-NO-FP: "-target-feature" "-neon"