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From: "gnugcc at emblocks dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/56441] [ARM Thumb] generated asm code produces "branch out of range" error in gas with -O1 -mcpu=cortex-m3
Date: Mon, 25 Feb 2013 13:15:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56441

--- Comment #5 from gnugcc at emblocks dot org 2013-02-25 13:14:46 UTC ---
Could it be that in the file arm.md concerning the following snippet:

(define_insn "*arm_jump"
  [(set (pc)
    (label_ref (match_operand 0 "" "")))]
  "TARGET_32BIT"
  "*
  {
    if (arm_ccfsm_state == 1 || arm_ccfsm_state == 2)
      {
        arm_ccfsm_state += 2;
        return \"\";
      }
    return \"b%?\\t%l0\";
  }
  "
  [(set_attr "predicable" "yes")
   (set (attr "length")
    (if_then_else
       (and (match_test "TARGET_THUMB2")
        (and (ge (minus (match_dup 0) (pc)) (const_int -2044))
             (le (minus (match_dup 0) (pc)) (const_int 2048))))
       (const_int 2)
       (const_int 4)))]
)


the (match_test "TARGET_THUMB2")  must be replaced by

(and (not(match_test "TARGET_THUMB2"))


same for
- "*arm_cond_branch"
- "*arm_cond_branch_reversed"


the assembler always uses b.w even if the branch is only 10 bytes away.

Regards