pprReg :: Format -> Reg -> SDoc
pprReg f r
  = case r of
      RegReal    (RealRegSingle i) ->
          sdocWithPlatform $ \platform ->
          if target32Bit platform then ppr32_reg_no f i
                                  else ppr64_reg_no f i
      RegReal    (RealRegPair _ _) -> panic "X86.Ppr: no reg pairs on this arch"
      RegVirtual (VirtualRegI  u)  -> text "%vI_"   <> pprUniqueAlways u
      RegVirtual (VirtualRegHi u)  -> text "%vHi_"  <> pprUniqueAlways u
      RegVirtual (VirtualRegF  u)  -> text "%vF_"   <> pprUniqueAlways u
      RegVirtual (VirtualRegD  u)  -> text "%vD_"   <> pprUniqueAlways u

  where
    ppr32_reg_no :: Format -> Int -> SDoc
    ppr32_reg_no II8   = ppr32_reg_byte
    ppr32_reg_no II16  = ppr32_reg_word
    ppr32_reg_no _     = ppr32_reg_long

    ppr32_reg_byte i = ptext
      (case i of {
         0 -> sLit "%al";     1 -> sLit "%bl";
         2 -> sLit "%cl";     3 -> sLit "%dl";
        _  -> sLit $ "very naughty I386 byte register: " ++ show i
      })

    ppr32_reg_word i = ptext
      (case i of {
         0 -> sLit "%ax";     1 -> sLit "%bx";
         2 -> sLit "%cx";     3 -> sLit "%dx";
         4 -> sLit "%si";     5 -> sLit "%di";
         6 -> sLit "%bp";     7 -> sLit "%sp";
        _  -> sLit "very naughty I386 word register"
      })

    ppr32_reg_long i = ptext
      (case i of {
         0 -> sLit "%eax";    1 -> sLit "%ebx";
         2 -> sLit "%ecx";    3 -> sLit "%edx";
         4 -> sLit "%esi";    5 -> sLit "%edi";
         6 -> sLit "%ebp";    7 -> sLit "%esp";
         _  -> ppr_reg_float i
      })

    ppr64_reg_no :: Format -> Int -> SDoc
    ppr64_reg_no II8   = ppr64_reg_byte
    ppr64_reg_no II16  = ppr64_reg_word
    ppr64_reg_no II32  = ppr64_reg_long
    ppr64_reg_no _     = ppr64_reg_quad

    ppr64_reg_byte i = ptext
      (case i of {
         0 -> sLit "%al";     1 -> sLit "%bl";
         2 -> sLit "%cl";     3 -> sLit "%dl";
         4 -> sLit "%sil";    5 -> sLit "%dil"; -- new 8-bit regs!
         6 -> sLit "%bpl";    7 -> sLit "%spl";
         8 -> sLit "%r8b";    9  -> sLit "%r9b";
        10 -> sLit "%r10b";   11 -> sLit "%r11b";
        12 -> sLit "%r12b";   13 -> sLit "%r13b";
        14 -> sLit "%r14b";   15 -> sLit "%r15b";
        _  -> sLit $ "very naughty x86_64 byte register: " ++ show i
      })

    ppr64_reg_word i = ptext
      (case i of {
         0 -> sLit "%ax";     1 -> sLit "%bx";
         2 -> sLit "%cx";     3 -> sLit "%dx";
         4 -> sLit "%si";     5 -> sLit "%di";
         6 -> sLit "%bp";     7 -> sLit "%sp";
         8 -> sLit "%r8w";    9  -> sLit "%r9w";
        10 -> sLit "%r10w";   11 -> sLit "%r11w";
        12 -> sLit "%r12w";   13 -> sLit "%r13w";
        14 -> sLit "%r14w";   15 -> sLit "%r15w";
        _  -> sLit "very naughty x86_64 word register"
      })

    ppr64_reg_long i = ptext
      (case i of {
         0 -> sLit "%eax";    1  -> sLit "%ebx";
         2 -> sLit "%ecx";    3  -> sLit "%edx";
         4 -> sLit "%esi";    5  -> sLit "%edi";
         6 -> sLit "%ebp";    7  -> sLit "%esp";
         8 -> sLit "%r8d";    9  -> sLit "%r9d";
        10 -> sLit "%r10d";   11 -> sLit "%r11d";
        12 -> sLit "%r12d";   13 -> sLit "%r13d";
        14 -> sLit "%r14d";   15 -> sLit "%r15d";
        _  -> sLit "very naughty x86_64 register"
      })

    ppr64_reg_quad i = ptext
      (case i of {
         0 -> sLit "%rax";      1 -> sLit "%rbx";
         2 -> sLit "%rcx";      3 -> sLit "%rdx";
         4 -> sLit "%rsi";      5 -> sLit "%rdi";
         6 -> sLit "%rbp";      7 -> sLit "%rsp";
         8 -> sLit "%r8";       9 -> sLit "%r9";
        10 -> sLit "%r10";    11 -> sLit "%r11";
        12 -> sLit "%r12";    13 -> sLit "%r13";
        14 -> sLit "%r14";    15 -> sLit "%r15";
        _  -> ppr_reg_float i
      })
pprReg :: Format -> Reg -> SDoc
pprReg f r
  = case r of
      RegReal    (RealRegSingle i) ->
          sdocWithPlatform $ \platform ->
          if target32Bit platform then ppr32_reg_no f i
                                  else ppr64_reg_no f i
      RegReal    (RealRegPair _ _) -> panic "X86.Ppr: no reg pairs on this arch"
      RegVirtual (VirtualRegI  u)  -> text "%vI_"   <> pprUniqueAlways u
      RegVirtual (VirtualRegHi u)  -> text "%vHi_"  <> pprUniqueAlways u
      RegVirtual (VirtualRegF  u)  -> text "%vF_"   <> pprUniqueAlways u
      RegVirtual (VirtualRegD  u)  -> text "%vD_"   <> pprUniqueAlways u

  where
    ppr32_reg_no :: Format -> Int -> SDoc
    ppr32_reg_no II8   = ppr32_reg_byte
    ppr32_reg_no II16  = ppr32_reg_word
    ppr32_reg_no _     = ppr32_reg_long

    ppr32_reg_byte i = ptext
      (case i of {
         0 -> sLit "%al";     1 -> sLit "%bl";
         2 -> sLit "%cl";     3 -> sLit "%dl";
        _  -> sLit $ "very naughty I386 byte register: " ++ show i
      })

    ppr32_reg_word i = ptext
      (case i of {
         0 -> sLit "%ax";     1 -> sLit "%bx";
         2 -> sLit "%cx";     3 -> sLit "%dx";
         4 -> sLit "%si";     5 -> sLit "%di";
         6 -> sLit "%bp";     7 -> sLit "%sp";
        _  -> sLit "very naughty I386 word register"
      })

    ppr32_reg_long i = ptext
      (case i of {
         0 -> sLit "%eax";    1 -> sLit "%ebx";
         2 -> sLit "%ecx";    3 -> sLit "%edx";
         4 -> sLit "%esi";    5 -> sLit "%edi";
         6 -> sLit "%ebp";    7 -> sLit "%esp";
         _  -> ppr_reg_float i
      })

    ppr64_reg_no :: Format -> Int -> SDoc
    ppr64_reg_no II8   = ppr64_reg_byte
    ppr64_reg_no II16  = ppr64_reg_word
    ppr64_reg_no II32  = ppr64_reg_long
    ppr64_reg_no _     = ppr64_reg_quad

    ppr64_reg_byte i = ptext
      (case i of {
         0 -> sLit "%al";     1 -> sLit "%bl";
         2 -> sLit "%cl";     3 -> sLit "%dl";
         4 -> sLit "%sil";    5 -> sLit "%dil"; -- new 8-bit regs!
         6 -> sLit "%bpl";    7 -> sLit "%spl";
         8 -> sLit "%r8b";    9  -> sLit "%r9b";
        10 -> sLit "%r10b";   11 -> sLit "%r11b";
        12 -> sLit "%r12b";   13 -> sLit "%r13b";
        14 -> sLit "%r14b";   15 -> sLit "%r15b";
        _  -> sLit $ "very naughty x86_64 byte register: " ++ show i
      })

    ppr64_reg_word i = ptext
      (case i of {
         0 -> sLit "%ax";     1 -> sLit "%bx";
         2 -> sLit "%cx";     3 -> sLit "%dx";
         4 -> sLit "%si";     5 -> sLit "%di";
         6 -> sLit "%bp";     7 -> sLit "%sp";
         8 -> sLit "%r8w";    9  -> sLit "%r9w";
        10 -> sLit "%r10w";   11 -> sLit "%r11w";
        12 -> sLit "%r12w";   13 -> sLit "%r13w";
        14 -> sLit "%r14w";   15 -> sLit "%r15w";
        _  -> sLit "very naughty x86_64 word register"
      })

    ppr64_reg_long i = ptext
      (case i of {
         0 -> sLit "%eax";    1  -> sLit "%ebx";
         2 -> sLit "%ecx";    3  -> sLit "%edx";
         4 -> sLit "%esi";    5  -> sLit "%edi";
         6 -> sLit "%ebp";    7  -> sLit "%esp";
         8 -> sLit "%r8d";    9  -> sLit "%r9d";
        10 -> sLit "%r10d";   11 -> sLit "%r11d";
        12 -> sLit "%r12d";   13 -> sLit "%r13d";
        14 -> sLit "%r14d";   15 -> sLit "%r15d";
        _  -> sLit "very naughty x86_64 register"
      })

    ppr64_reg_quad i = ptext
      (case i of {
         0 -> sLit "%rax";      1 -> sLit "%rbx";
         2 -> sLit "%rcx";      3 -> sLit "%rdx";
         4 -> sLit "%rsi";      5 -> sLit "%rdi";
         6 -> sLit "%rbp";      7 -> sLit "%rsp";
         8 -> sLit "%r8";       9 -> sLit "%r9";
        10 -> sLit "%r10";    11 -> sLit "%r11";
        12 -> sLit "%r12";    13 -> sLit "%r13";
        14 -> sLit "%r14";    15 -> sLit "%r15";
        _  -> ppr_reg_float i
      })
pprReg f r
  = case r of
      RegReal    (RealRegSingle i) ->
          sdocWithPlatform $ \platform ->
          if target32Bit platform then ppr32_reg_no f i
                                  else ppr64_reg_no f i
      RegReal    (RealRegPair _ _) -> panic "X86.Ppr: no reg pairs on this arch"
      RegVirtual (VirtualRegI  u)  -> text "%vI_"   <> pprUniqueAlways u
      RegVirtual (VirtualRegHi u)  -> text "%vHi_"  <> pprUniqueAlways u
      RegVirtual (VirtualRegF  u)  -> text "%vF_"   <> pprUniqueAlways u
      RegVirtual (VirtualRegD  u)  -> text "%vD_"   <> pprUniqueAlways u

  where
    ppr32_reg_no :: Format -> Int -> SDoc
    ppr32_reg_no II8   = ppr32_reg_byte
    ppr32_reg_no II16  = ppr32_reg_word
    ppr32_reg_no _     = ppr32_reg_long

    ppr32_reg_byte i = ptext
      (case i of {
         0 -> sLit "%al";     1 -> sLit "%bl";
         2 -> sLit "%cl";     3 -> sLit "%dl";
        _  -> sLit $ "very naughty I386 byte register: " ++ show i
      })

    ppr32_reg_word i = ptext
      (case i of {
         0 -> sLit "%ax";     1 -> sLit "%bx";
         2 -> sLit "%cx";     3 -> sLit "%dx";
         4 -> sLit "%si";     5 -> sLit "%di";
         6 -> sLit "%bp";     7 -> sLit "%sp";
        _  -> sLit "very naughty I386 word register"
      })

    ppr32_reg_long i = ptext
      (case i of {
         0 -> sLit "%eax";    1 -> sLit "%ebx";
         2 -> sLit "%ecx";    3 -> sLit "%edx";
         4 -> sLit "%esi";    5 -> sLit "%edi";
         6 -> sLit "%ebp";    7 -> sLit "%esp";
         _  -> ppr_reg_float i
      })

    ppr64_reg_no :: Format -> Int -> SDoc
    ppr64_reg_no II8   = ppr64_reg_byte
    ppr64_reg_no II16  = ppr64_reg_word
    ppr64_reg_no II32  = ppr64_reg_long
    ppr64_reg_no _     = ppr64_reg_quad

    ppr64_reg_byte i = ptext
      (case i of {
         0 -> sLit "%al";     1 -> sLit "%bl";
         2 -> sLit "%cl";     3 -> sLit "%dl";
         4 -> sLit "%sil";    5 -> sLit "%dil"; -- new 8-bit regs!
         6 -> sLit "%bpl";    7 -> sLit "%spl";
         8 -> sLit "%r8b";    9  -> sLit "%r9b";
        10 -> sLit "%r10b";   11 -> sLit "%r11b";
        12 -> sLit "%r12b";   13 -> sLit "%r13b";
        14 -> sLit "%r14b";   15 -> sLit "%r15b";
        _  -> sLit $ "very naughty x86_64 byte register: " ++ show i
      })

    ppr64_reg_word i = ptext
      (case i of {
         0 -> sLit "%ax";     1 -> sLit "%bx";
         2 -> sLit "%cx";     3 -> sLit "%dx";
         4 -> sLit "%si";     5 -> sLit "%di";
         6 -> sLit "%bp";     7 -> sLit "%sp";
         8 -> sLit "%r8w";    9  -> sLit "%r9w";
        10 -> sLit "%r10w";   11 -> sLit "%r11w";
        12 -> sLit "%r12w";   13 -> sLit "%r13w";
        14 -> sLit "%r14w";   15 -> sLit "%r15w";
        _  -> sLit "very naughty x86_64 word register"
      })

    ppr64_reg_long i = ptext
      (case i of {
         0 -> sLit "%eax";    1  -> sLit "%ebx";
         2 -> sLit "%ecx";    3  -> sLit "%edx";
         4 -> sLit "%esi";    5  -> sLit "%edi";
         6 -> sLit "%ebp";    7  -> sLit "%esp";
         8 -> sLit "%r8d";    9  -> sLit "%r9d";
        10 -> sLit "%r10d";   11 -> sLit "%r11d";
        12 -> sLit "%r12d";   13 -> sLit "%r13d";
        14 -> sLit "%r14d";   15 -> sLit "%r15d";
        _  -> sLit "very naughty x86_64 register"
      })

    ppr64_reg_quad i = ptext
      (case i of {
         0 -> sLit "%rax";      1 -> sLit "%rbx";
         2 -> sLit "%rcx";      3 -> sLit "%rdx";
         4 -> sLit "%rsi";      5 -> sLit "%rdi";
         6 -> sLit "%rbp";      7 -> sLit "%rsp";
         8 -> sLit "%r8";       9 -> sLit "%r9";
        10 -> sLit "%r10";    11 -> sLit "%r11";
        12 -> sLit "%r12";    13 -> sLit "%r13";
        14 -> sLit "%r14";    15 -> sLit "%r15";
        _  -> ppr_reg_float i
      })