tic4x: sign extension using shifts

[deliverable/binutils-gdb.git] / opcodes / aarch64-dis.c

diff --git a/opcodes/aarch64-dis.c b/opcodes/aarch64-dis.c
index 8b32097a5fa116d728e7e70b15be11534740c843..7bd2c49aee39e724f3cce375cd2fa965f9c06718 100644 (file)
--- a/opcodes/aarch64-dis.c
+++ b/opcodes/aarch64-dis.c
@@ -1,5 +1,5 @@
 /* aarch64-dis.c -- AArch64 disassembler.
 /* aarch64-dis.c -- AArch64 disassembler.

-   Copyright (C) 2009-2019 Free Software Foundation, Inc.
+   Copyright (C) 2009-2020 Free Software Foundation, Inc.

    Contributed by ARM Ltd.
 
    This file is part of the GNU opcodes library.
    Contributed by ARM Ltd.
 
    This file is part of the GNU opcodes library.


@@ -178,18 +178,15 @@ extract_all_fields (const aarch64_operand *self, aarch64_insn code)
 }
 
 /* Sign-extend bit I of VALUE.  */
 }
 
 /* Sign-extend bit I of VALUE.  */

-static inline int32_t
+static inline uint64_t

 sign_extend (aarch64_insn value, unsigned i)
 {
 sign_extend (aarch64_insn value, unsigned i)
 {

-  uint32_t ret = value;
+  uint64_t ret, sign;

 
   assert (i < 32);
 
   assert (i < 32);

-  if ((value >> i) & 0x1)
-    {
-      uint32_t val = (uint32_t)(-1) << i;
-      ret = ret | val;
-    }
-  return (int32_t) ret;
+  ret = value;
+  sign = (uint64_t) 1 << i;
+  return ((ret & (sign + sign - 1)) ^ sign) - sign;

 }
 
 /* N.B. the following inline helpfer functions create a dependency on the
 }
 
 /* N.B. the following inline helpfer functions create a dependency on the


@@ -658,7 +655,7 @@ aarch64_ext_imm (const aarch64_operand *self, aarch64_opnd_info *info,
                 const aarch64_inst *inst ATTRIBUTE_UNUSED,
                 aarch64_operand_error *errors ATTRIBUTE_UNUSED)
 {
                 const aarch64_inst *inst ATTRIBUTE_UNUSED,
                 aarch64_operand_error *errors ATTRIBUTE_UNUSED)
 {

-  int64_t imm;
+  uint64_t imm;

 
   imm = extract_all_fields (self, code);
 
 
   imm = extract_all_fields (self, code);