bugGNU Development Chain for 68HC11/68HC12 - Bugs: bug #15822, Erroneous code generation of...


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bug #15822: Erroneous code generation of increment.

Submitter:  Frances Cohen <fcohen>
Submitted:  Mon 20 Feb 2006 09:28:31 PM UTC
Category:  gcc Severity:  3 - Normal
Item Group:  sw-bug Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Mon 20 Feb 2006 09:28:31 PM UTC, original submission:  

The following line:
 _io_ports[MC6812_SCIDRL + m_Port]= m_TXBuffer[m_TxHead++];

Is generating a bad increment of m_TxHead.  The increment of the above line is being compiled as:
  LDX  _Frame (1292)
  INC  1A, X

when it should read
  LDX  _Frame (1292)
  LDX  0, X
  LDX  1A, X

In short, it is losing a layer of indirection, and updating offset the stack frame instead of offset my "this" pointer. It worked when my "m_Port" was 8 bit, but failed when I changed it to 16 bit (if that is any help). 
I am using the latest 3.1 compiler (is also on 3.01 compiler). My flags are:
CXXFLAGS +=-g -c -Os -mshort -fno-exceptions -fno-rtti -m68hc12 $(INCLUDEFLAGS)

Frances Cohen <fcohen>


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