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Full Discussion: Results for Linux Benchmarks
UNIX Standards and Benchmarks UNIX & LINUX Benchmarks (Version 3.11) Linux Benchmarks Results for Linux Benchmarks Post 44616 by cpjain on Tuesday 9th of December 2003 05:43:36 AM
Old 12-09-2003
Arithmetic tests needs to be updated for advanced compiler optimization

Hi,
I was trying to build Linux Benchmarks with latest Intel C++ Compiler.
When I used -ipo (inter-procedural optimization) option, arithmetic test (arith.c) failed on execution.

The problem is Intel compiler's advanced optimization option (-ipo) optimizes much more than expected and this results in elimination of some part of code.
/-------------------------------------------------
++iter;
/* the loop calls a function to insure that something is done
the results of the function are fed back in (just so they
they won't be thrown away. A loop with
unused assignments may get optimized out of existence */
result = dumb_stuff(result);
/--------------------------------------------------------

This part gets eliminated becuase of IPO.

Steps to reproduce:
$icc -o ./pgms/arithoh -DTIME -O3 -xW -ipo -static -unroll -Darithoh ./src/arith.c

$./pgms/arithoh 1
0 loops

and this results in divide by zero error.

Regards,
CP
 

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IASL(8) 						    BSD System Manager's Manual 						   IASL(8)

NAME
iasl -- Intel ASL compiler and disassembler (iASL) SYNOPSIS
iasl [options] <input file> DESCRIPTION
The iasl is a fully-featured compiler for the ACPI Source Language (ASL). It translates ASL to ACPI Machine Language (AML), but iasl can also act as a disassembler, translating AML to ASL. OPTIONS
Global -@ file Specify command file. -I dir Specify additional include directory. General Output -p prefix Specify a path or filename prefix for all output files. -va Disable all errors and warnings in the summary. -vi Use less verbose errors and warnings. -vo Enable optimization comments. -vr Disable remarks. -vs Disable signon. -w 1 | 2 | 3 Set warning reporting level. AML Output Files -s a | c Create AML in assembler (*.asm) or C (*.c) source file. -i a | c Create assembler (*.inc) or C (*.h) include file. -t a | c Create AML in assembler or C hex table (*.hex). AML Code Generation -oa Disable all optimizations (compatibility mode). -of Disable constant folding. -oi Disable integer optimization to operation codes. -on Disable named reference string optimization. -r revision Override table header revision (1-255). Listings -l Create mixed, ASL and AML, listing file (*.lst). -ln Create namespace file (*.nsp). -ls Create combined source file (*.src). AML Disassembler -d file Disassemble binary ACPI table to a file (*.dsl). -dc file Disassemble AML and immediately compile it. -e f1, f2 Include ACPI table(s) for external symbol resolution. -2 Emit ACPI 2.0 compatible ASL code. -g Get ACPI tables and write to files (*.dat). Help -h Display additional help and compiler debug options. -hc Display operators allowed in constant expressions. -hr Display ACPI reserved method names. SEE ALSO
acpi(4), acpidump(8), amldb(8) Intel Corporation, iASL Compiler/Disassembler User Reference, Revision 2.00, http://www.acpica.org/download/aslcompiler.pdf, September 18, 2009. HISTORY
The iasl compiler/disassembler is part of the Intel ACPI Component Architecture (ACPICA). It first appeared in NetBSD 6.0. AUTHORS
Among Intel engineers, Robert Moore <robert.moore@intel.com> was the chief architect behind iasl. This manual page was written for NetBSD by Jukka Ruohonen <jruohonen@iki.fi>. BSD
April 10, 2010 BSD
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