* include/opcode/tic6x.h: add tic6x_coding_dreg_(msb|lsb) field coding type in

order to encode separately the msb and lsb of a register pair ; this will be
needed to encode the opcodes the same
way as Ti assembler does.

* gas/config/tc-tic6x.c: handle tic6x_coding_dreg_(msb|lsb)  field coding types
and use it to encode register pair numbers when required.

* opcodes/tic6x-dis.c: decodes opcodes that have individual msb and lsb halves
in src1 & src2 fields ; discard the src1 (lsb) value and only use src2 (msb),
discarding bit 0, to follow what Ti SDK does in that case as any value in the
src1 field yields the same output with SDK disassembler.

* include/opcode/tic6x-opcode-table.h: modify absdp, dpint, dpsp, dptrunc,
rcpdp and rsqrdp opcodes to use the new field coding types.

* gas/testsuite/gas/tic6x/insns-c674x.d, gas/testsuite/gas/tic6x/insns-c674x.s
: add test case for the newly generated opcode but keep the old ones as they
seem legit as per Ti disassembler output.

3 files changed, 36 insertions, 16 deletions

diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index a46900ac1..69d0859e1 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,13 @@
+2013-03-20  Alexis Deruelle  <alexis.deruelle@gmail.com>
+
+	PR gas/15095
+	* tic6x.h (enum tic6x_coding_method): Add
+	tic6x_coding_dreg_(msb|lsb) field coding type in order to encode
+	separately the msb and lsb of a register pair.  This is needed to
+	encode the opcodes in the same way as TI assembler does.
+	* tic6x-opcode-table.h: Modify absdp, dpint, dpsp, dptrunc, rcpdp
+	and rsqrdp opcodes to use the new field coding types.
+
 2013-03-11  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* arm.h (CRC_EXT_ARMV8): New constant.
diff --git a/include/opcode/tic6x-opcode-table.h b/include/opcode/tic6x-opcode-table.h
index 45e26fb87..abebd3c17 100644
--- a/include/opcode/tic6x-opcode-table.h
+++ b/include/opcode/tic6x-opcode-table.h
@@ -1,6 +1,5 @@
 /* TI C6X opcode table.
-   Copyright 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright 2010-2013 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -129,9 +128,10 @@ INSN(abs2, l, unary, 1cycle, C64X, 0,
 	  ENC(dst, reg, 1)))
 
 INSN(absdp, s, 1_or_2_src, 2cycle_dp, C67X, TIC6X_FLAG_NO_CROSS,
-     FIX3(FIX(op, 0x2c), FIX(x, 0), FIX(src1, 0)),
+     FIX2(FIX(op, 0x2c), FIX(x, 0)),
      OP2(ORREGD1, OWREGD12),
-     ENC3(ENC(s, fu, 0), ENC(src2, reg, 0), ENC(dst, reg, 1)))
+     ENC4(ENC(s, fu, 0), ENC(src2, regpair_msb, 0), ENC(src1, regpair_lsb, 0),
+	  ENC(dst, reg, 1)))
 
 INSN(abssp, s, unary, 1cycle, C67X, 0,
      FIX1(FIX(op, 0)),
@@ -916,19 +916,22 @@ INSN(dpackx2, l, 1_or_2_src_noncond, 1cycle, C64XP, 0,
 	  ENC(src2, reg, 1), ENC(dst, reg, 2)))
 
 INSN(dpint, l, 1_or_2_src, 4cycle, C67X, TIC6X_FLAG_NO_CROSS,
-     FIX3(FIX(op, 0x8), FIX(x, 0), FIX(src1, 0)),
+     FIX2(FIX(op, 0x8), FIX(x, 0)),
      OP2(ORREGD1, OWREG4),
-     ENC3(ENC(s, fu, 0), ENC(src2, reg, 0), ENC(dst, reg, 1)))
+     ENC4(ENC(s, fu, 0), ENC(src2, regpair_msb, 0), ENC(src1, regpair_lsb, 0),
+	  ENC(dst, reg, 1)))
 
 INSN(dpsp, l, 1_or_2_src, 4cycle, C67X, TIC6X_FLAG_NO_CROSS,
-     FIX3(FIX(op, 0x9), FIX(x, 0), FIX(src1, 0)),
+     FIX2(FIX(op, 0x9), FIX(x, 0)),
      OP2(ORREGD1, OWREG4),
-     ENC3(ENC(s, fu, 0), ENC(src2, reg, 0), ENC(dst, reg, 1)))
+     ENC4(ENC(s, fu, 0), ENC(src2, regpair_msb, 0), ENC(src1, regpair_lsb, 0),
+	  ENC(dst, reg, 1)))
 
 INSN(dptrunc, l, 1_or_2_src, 4cycle, C67X, TIC6X_FLAG_NO_CROSS,
-     FIX3(FIX(op, 0x1), FIX(x, 0), FIX(src1, 0)),
+     FIX2(FIX(op, 0x1), FIX(x, 0)),
      OP2(ORREGD1, OWREG4),
-     ENC3(ENC(s, fu, 0), ENC(src2, reg, 0), ENC(dst, reg, 1)))
+     ENC4(ENC(s, fu, 0), ENC(src2, regpair_msb, 0), ENC(src1, regpair_lsb, 0),
+	  ENC(dst, reg, 1)))
 
 INSN(ext, s, field, 1cycle, C62X, TIC6X_FLAG_NO_CROSS,
      FIX1(FIX(op, 0x1)),
@@ -1617,9 +1620,10 @@ INSN(packl4, l, 1_or_2_src, 1cycle, C64X, 0,
 	  ENC(src2, reg, 1), ENC(dst, reg, 2)))
 
 INSN(rcpdp, s, 1_or_2_src, 2cycle_dp, C67X, TIC6X_FLAG_NO_CROSS,
-     FIX3(FIX(op, 0x2d), FIX(x, 0), FIX(src1, 0)),
+     FIX2(FIX(op, 0x2d), FIX(x, 0)),
      OP2(ORREGD1, OWREGD12),
-     ENC3(ENC(s, fu, 0), ENC(src2, reg, 0), ENC(dst, reg, 1)))
+     ENC4(ENC(s, fu, 0), ENC(src2, regpair_msb, 0), ENC(src1, regpair_lsb, 0),
+	  ENC(dst, reg, 1)))
 
 INSN(rcpsp, s, 1_or_2_src, 1cycle, C67X, 0,
      FIX2(FIX(op, 0x3d), FIX(src1, 0)),
@@ -1677,9 +1681,10 @@ INSN(rpack2, s, ext_1_or_2_src_noncond, 1cycle, C64XP, 0,
 	  ENC(src2, reg, 1), ENC(dst, reg, 2)))
 
 INSN(rsqrdp, s, 1_or_2_src, 2cycle_dp, C67X, TIC6X_FLAG_NO_CROSS,
-     FIX3(FIX(op, 0x2e), FIX(x, 0), FIX(src1, 0)),
+     FIX2(FIX(op, 0x2e), FIX(x, 0)),
      OP2(ORREGD1, OWREGD12),
-     ENC3(ENC(s, fu, 0), ENC(src2, reg, 0), ENC(dst, reg, 1)))
+     ENC4(ENC(s, fu, 0), ENC(src2, regpair_msb, 0), ENC(src1, regpair_lsb, 0),
+	  ENC(dst, reg, 1)))
 
 INSN(rsqrsp, s, 1_or_2_src, 1cycle, C67X, 0,
      FIX2(FIX(op, 0x3e), FIX(src1, 0)),
diff --git a/include/opcode/tic6x.h b/include/opcode/tic6x.h
index 2a7a2463d..168f66023 100644
--- a/include/opcode/tic6x.h
+++ b/include/opcode/tic6x.h
@@ -1,6 +1,5 @@
 /* TI C6X opcode information.
-   Copyright 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright 2010-2013 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -380,6 +379,12 @@ typedef enum
        the field.  When applied to a memory reference, encode the base
        register.  */
     tic6x_coding_reg,
+    /* Encode the register-pair's lsb (even register) for instructions
+       that use src1 as port for loading lsb of double-precision
+       operand value (absdp, dpint, dpsp, dptrunc, rcpdp, rsqrdp).  */
+    tic6x_coding_regpair_lsb,
+    /* Encode the register-pair's msb (odd register), see above.  */ 
+    tic6x_coding_regpair_msb,
     /* Store 0 for register B14, 1 for register B15.  When applied to
        a memory reference, encode the base register.  */
     tic6x_coding_areg,