diff options
Diffstat (limited to 'arm/PrintAsm.ml')
| -rw-r--r-- | arm/PrintAsm.ml | 48 |
1 files changed, 4 insertions, 44 deletions
diff --git a/arm/PrintAsm.ml b/arm/PrintAsm.ml index 1bac715..fc7c987 100644 --- a/arm/PrintAsm.ml +++ b/arm/PrintAsm.ml @@ -336,28 +336,16 @@ let print_builtin_vstore_global oc chunk id ofs args = let n = print_builtin_vstore_common oc chunk (IR IR14 :: args) in fprintf oc "%s end builtin __builtin_volatile_write\n" comment; n + 1 -(* Magic sequence for byte-swapping *) - -let print_bswap oc src tmp dst = - (* tmp <> src, tmp <> dst, but can have dst = src *) - (* src = A . B .C . D *) - fprintf oc " eor %a, %a, %a, ror #16\n" ireg tmp ireg src ireg src; - (* tmp = A^C . B^D . C^A . D^B *) - fprintf oc " bic %a, %a, #0x00FF0000\n" ireg tmp ireg tmp; - (* tmp = A^C . 000 . C^A . D^B *) - fprintf oc " mov %a, %a, ror #8\n" ireg dst ireg src; - (* dst = D . A . B . C *) - fprintf oc " eor %a, %a, %a, lsr #8\n" ireg dst ireg dst ireg tmp - (* dst = D . A^A^C . B . C^C^A = D . C . B . A *) - (* Handling of compiler-inlined builtins *) let print_builtin_inline oc name args res = fprintf oc "%s begin %s\n" comment name; let n = match name, args, res with (* Integer arithmetic *) - | "__builtin_bswap", [IR a1], [IR res] -> - print_bswap oc a1 IR14 res; 4 + | ("__builtin_bswap" | "__builtin_bswap32"), [IR a1], [IR res] -> + fprintf oc " rev %a, %a\n" ireg res ireg a1; 1 + | "__builtin_bswap16", [IR a1], [IR res] -> + fprintf oc " rev16 %a, %a\n" ireg res ireg a1; 1 | "__builtin_cntlz", [IR a1], [IR res] -> fprintf oc " clz %a, %a\n" ireg res ireg a1; 1 (* Float arithmetic *) @@ -400,34 +388,6 @@ let print_builtin_inline oc name args res = end else begin fprintf oc " umull %a, %a, %a, %a\n" ireg rl ireg rh ireg a ireg b; 1 end - (* Memory accesses *) - | "__builtin_read16_reversed", [IR a1], [IR res] -> - fprintf oc " ldrh %a, [%a, #0]\n" ireg res ireg a1; - fprintf oc " mov %a, %a, lsl #8\n" ireg IR14 ireg res; - fprintf oc " and %a, %a, #0xFF00\n" ireg IR14 ireg IR14; - fprintf oc " orr %a, %a, %a, lsr #8\n" ireg res ireg IR14 ireg res; 4 - | "__builtin_read32_reversed", [IR a1], [IR res] -> - fprintf oc " ldr %a, [%a, #0]\n" ireg res ireg a1; - print_bswap oc res IR14 res; 5 - | "__builtin_write16_reversed", [IR a1; IR a2], _ -> - fprintf oc " mov %a, %a, lsr #8\n" ireg IR14 ireg a2; - fprintf oc " and %a, %a, #0xFF\n" ireg IR14 ireg IR14; - fprintf oc " orr %a, %a, %a, lsl #8\n" ireg IR14 ireg IR14 ireg a2; - fprintf oc " strh %a, [%a, #0]\n" ireg IR14 ireg a1; 4 - | "__builtin_write32_reversed", [IR a1; IR a2], _ -> - if a1 <> IR12 then begin - print_bswap oc a2 IR14 IR12; - fprintf oc " str %a, [%a, #0]\n" ireg IR12 ireg a1; 5 - end else begin - fprintf oc " mov %a, %a, lsr #24\n" ireg IR14 ireg a2; - fprintf oc " str %a, [%a, #0]\n" ireg IR14 ireg a1; - fprintf oc " mov %a, %a, lsr #16\n" ireg IR14 ireg a2; - fprintf oc " str %a, [%a, #1]\n" ireg IR14 ireg a1; - fprintf oc " mov %a, %a, lsr #8\n" ireg IR14 ireg a2; - fprintf oc " str %a, [%a, #2]\n" ireg IR14 ireg a1; - fprintf oc " str %a, [%a, #3]\n" ireg IR14 ireg a1; - 7 - end (* Catch-all *) | _ -> invalid_arg ("unrecognized builtin " ^ name) |