bugGNU Development Chain for 68HC11/68HC12 - Bugs: bug #10207, invalid shift long computation...


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bug #10207: invalid shift long computation with -fomit-frame-pointer

Submitter:  Stephane Carrez <ciceron>
Submitted:  Sun 29 Aug 2004 10:17:27 AM UTC
Category:  gcc Severity:  3 - Normal
Item Group:  sw-bug Status:  Fixed
Privacy:  Public Assigned to:  ciceron
Open/Closed:  Closed

Sun 29 Aug 2004 07:55:36 PM UTC, comment #1: 

Fixed in r2.92.

Stephane Carrez <ciceron>
Group administrator
Sun 29 Aug 2004 10:17:27 AM UTC, original submission:  

The following example fails when it is compiled with

-m68hc12 -O -fomit-frame-pointer -mshort

The generated code is wrong because the shift count
loaded by 'shl' is loaded at an invalid stack offset.
This example works with gcc 3.0.4 but fails with gcc 3.3.

typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned long uint32_t;

uint32_t test;

void shl(uint8_t Nr)
    test |= (1L<<Nr);

int main(void)
  test = 1;
  if (test != 5L)
     return 1;
  if (test != (5L | (1L << 17)))
     return 1;
  return 0;

Stephane Carrez <ciceron>
Group administrator


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Follow 2 latest changes.

Date Changed by Updated Field Previous Value => Replaced by
2004-08-29 ciceron StatusNone Fixed
    Open/ClosedOpen Closed

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