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c/4454: Suboptimal schedule following unroll of "reversed" loops in gcc

To: gcc-gnats at gcc dot gnu dot org
Subject: c/4454: Suboptimal schedule following unroll of "reversed" loops in gcc
From: gheorghe at us dot ibm dot com
Date: 3 Oct 2001 13:49:45 -0000
Reply-To: gheorghe at us dot ibm dot com

>Number:         4454
>Category:       c
>Synopsis:       Suboptimal schedule following unroll of "reversed" loops in gcc
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          pessimizes-code
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 03 06:56:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     George Almasi
>Release:        gcc version 2.95.2 19991024 (release); gcc version 2.95.3 20010315 (release); possibly 3.0.1 also.
>Organization:
>Environment:
MIPS running IRIX 6.5, -n32 ABI. Possibly many
other architectures affected.
PPC/AIX, Intel/Linux, Sparc/Solaris not affected, but
proprietary architecture derived from MIPS affected.
>Description:
On certain architectures (notably MIPS) the following
loops are scheduled suboptimally:

1) the number of iterations in the loop is unknown (or odd)
at compile time.

2) the compiler attempts to "reverse" the loop counter to
match a "decrement-and-branch" instruction. This happens on
the MIPS platform.

3) the compiler attempts to unroll the loop (the options -O2
and -funroll-loops have to be set)

Under these circumstances the unrolled loop reuses the same
register several times *even when many other registers would
be available*, resulting in false register dependencies and
suboptimal scheduling.
>How-To-Repeat:
Compile the following snippet of code on the MIPS platform
with gcc 2.95.2 using the -O2 -funroll-loops option:

double worker(double *array, int size, int stride)
{
  double s = 0.0;
  int i;
  for(i = 0; i < size; i++)  s += array[i];
  return s;
}

The unrolled portion of the corresponding assembly file looks
as follows:

        l.d     $f1,0($4)
        add.d   $f0,$f0,$f1
        l.d     $f1,8($4)
        add.d   $f0,$f0,$f1
        l.d     $f1,16($4)
        add.d   $f0,$f0,$f1
        l.d     $f1,24($4)

>Fix:
The cause of the bug is that loop reversal destroys the 
so-called LUIDs in the code (linearized UIDs).

On of the steps in unrolling is to figure out what registers
are only live inside the loop body. These can be renamed
when unrolling. However, this feature only works if the 
LUIDs are correct. With broken LUIDs all registers are assumed
to have dependences outside the loop body; thus, the 
registers are not renamed and hence the operations cannot
be scheduled independently.

The file attachment I am including fixes this problem by
not using the LUIDs when figuring out the live registers.
It parses the non-linearized UID linked list instead.


>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="unroll.c.ga"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="unroll.c.ga"

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