[AArch64] Make the use of FP instructions optional, but enabled by default.

This adds a new subtarget feature called FPARMv8 (implied by NEON), and
predicates the support of the FP instructions and registers on this feature.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193739 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/Target/AArch64/AArch64InstrFormats.td b/lib/Target/AArch64/AArch64InstrFormats.td
index d69db31..7a41ce0 100644
--- a/lib/Target/AArch64/AArch64InstrFormats.td
+++ b/lib/Target/AArch64/AArch64InstrFormats.td
@@ -383,6 +383,8 @@ class A64I_extract<bit sf, bits<3> op, bit n,
   // Inherits Rd in 4-0
 }
 
+let Predicates = [HasFPARMv8] in {
+
 // Format for floating-point compare instructions.
 class A64I_fpcmp<bit m, bit s, bits<2> type, bits<2> op, bits<5> opcode2,
                 dag outs, dag ins, string asmstr,
@@ -562,6 +564,8 @@ class A64I_fpimm<bit m, bit s, bits<2> type, bits<5> imm5,
   // Inherit Rd in 4-0
 }
 
+}
+
 // Format for load-register (literal) instructions.
 class A64I_LDRlit<bits<2> opc, bit v,
                   dag outs, dag ins, string asmstr,