Thumb2 BFC was insufficiently encoded.

rdar://problem/9292717

llvm-svn: 129619

llvm/lib/Target/ARM/ARMInstrThumb2.td

@@ -2130,10 +2130,12 @@ def t2BFC : T2BitFI<(outs rGPR:$Rd), (ins rGPR:$src, bf_inv_mask_imm:$imm),
                 IIC_iUNAsi, "bfc", "\t$Rd, $imm",
                 [(set rGPR:$Rd, (and rGPR:$src, bf_inv_mask_imm:$imm))]> {
   let Inst{31-27} = 0b11110;
+  let Inst{26} = 0; // should be 0.
   let Inst{25} = 1;
   let Inst{24-20} = 0b10110;
   let Inst{19-16} = 0b1111; // Rn
   let Inst{15} = 0;
+  let Inst{5} = 0; // should be 0.
 
   bits<10> imm;
   let msb{4-0} = imm{9-5};

llvm/lib/Target/ARM/Disassembler/ThumbDisassemblerCore.h

@@ -1616,7 +1616,7 @@ static bool DisassembleThumb2Sat(MCInst &MI, unsigned Opcode, uint32_t insn,
 // o t2ADDri12, t2SUBri12: Rs Rn imm12
 // o t2LEApcrel (ADR): Rs imm12
 // o t2BFC (BFC): Rs Ro(TIED_TO) bf_inv_mask_imm
-// o t2BFI (BFI) (Currently not defined in LLVM as of Jan-07-2010)
+// o t2BFI (BFI): Rs Ro(TIED_TO) Rn bf_inv_mask_imm
 // o t2MOVi16: Rs imm16
 // o t2MOVTi16: Rs imm16
 // o t2SBFX (SBFX): Rs Rn lsb width

llvm/test/MC/Disassembler/ARM/thumb-tests.txt

@@ -12,6 +12,9 @@
 # CHECK:	bgt.w	#-16
 0x3f 0xf7 0xf8 0xaf
 
+# CHECK:	bfc	r0, #10, #10
+0x6f 0xf3 0x93 0x20
+
 # CHECK:	bfi	r2, r10, #0, #1
 0x6a 0xf3 0x00 0x02