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digitalmars.D.bugs - [Issue 2923] New: bug with -inline

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2923

           Summary: bug with -inline
           Product: D
           Version: 1.043
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: xurux1-mail yahoo.de


adding the -inline option produces wrong output, both with
Digital Mars D Compiler v1.043,
Digital Mars D Compiler v2.029
on windows.

import std.stdio; //writefln

int my_abs(int i) {
  return i<0 ? -i : i;
}

void main(char[][] args) {
  int rows=9;
  int mid=5;
  for (int j=0; j<rows; j++) {
    int leadSpaces=my_abs((mid-1)-j);
    for (int i=0; i<leadSpaces; i++)
      writef("-");               
    //writefln("%d:%d",j,leadSpaces);
    writefln("!");
  }
}
/*
CORRECT:
C:\dev\d>dmd -release -O -run compiler_bug1.d
----!
---!
--!
-!
!
-!
--!
---!
----!

WRONG:
C:\dev\d>dmd -release -O -inline -run compiler_bug1.d
!
!
!
!
!
!
!
!
!
*/


--
May 02 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2923


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au
            Summary|bug with -inline            |-O generates bad code for
                   |                            |?:
           Severity|normal                      |regression





Reduced test case:
dmd bug.d  //OK
dmd -O bug.d // fails.

Raising severity -- this is a VERY nasty bug. All the outer for loop does is
prevent constant folding. With -O enabled, the wrong branch of ?: gets taken.

void main() {
  for (int j=1; j<2; j++) {
    int x = (j<0) ? -j : j;
    int q=0;
    for (int i=0; i<x; i++) ++q;
    assert(q!=0);
  }
}

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May 15 2009
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2923


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED





02:49:09 PDT ---
Fixed dmd 1.046 and 2.031

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Jul 09 2009