[PATCH 3/3,ARM,libgcc]Code size optimization for the fmul/fdiv and dmul/ddiv function in libgcc

Tony Wang tony.wang@arm.com
Fri Sep 26 02:11:00 GMT 2014


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> -----Original Message-----
> From: Tony Wang [mailto:tony.wang@arm.com]
> Sent: Tuesday, September 16, 2014 11:01 AM
> To: 'gcc-patches@gcc.gnu.org'
> Cc: Richard Earnshaw; Ramana Radhakrishnan
> Subject: RE: [PATCH 3/3,ARM,libgcc]Code size optimization for the fmul/fdiv and dmul/ddiv function in libgcc
> 
> Ping?
> 
> > -----Original Message-----
> > From: Tony Wang [mailto:tony.wang@arm.com]
> > Sent: Thursday, September 04, 2014 10:16 AM
> > To: 'gcc-patches@gcc.gnu.org'
> > Cc: Richard Earnshaw; Ramana Radhakrishnan
> > Subject: RE: [PATCH 3/3,ARM,libgcc]Code size optimization for the fmul/fdiv and dmul/ddiv function in
libgcc
> >
> > Ping 2?
> >
> > > -----Original Message-----
> > > From: Tony Wang [mailto:tony.wang@arm.com]
> > > Sent: Thursday, August 28, 2014 2:02 PM
> > > To: 'gcc-patches@gcc.gnu.org'
> > > Cc: Richard Earnshaw; Ramana Radhakrishnan
> > > Subject: RE: [PATCH 3/3,ARM,libgcc]Code size optimization for the fmul/fdiv and dmul/ddiv function in
libgcc
> > >
> > > Ping?
> > >
> > > > -----Original Message-----
> > > > From: Tony Wang [mailto:tony.wang@arm.com]
> > > > Sent: Thursday, August 21, 2014 2:15 PM
> > > > To: 'gcc-patches@gcc.gnu.org'
> > > > Subject: [PATCH 3/3,ARM,libgcc]Code size optimization for the fmul/fdiv and dmul/ddiv function in
libgcc
> > > >
> > > > Step 3: Test cases to verify the code size reduction.
> > > >
> > > > gcc/gcc/testsuite/ChangeLog:
> > > > 2014-08-21  Tony Wang  <tony.wang@arm.com>
> > > >
> > > >         * gcc.target/arm/size-optimization-ieee-1.c: New test case
> > > >         * gcc.target/arm/size-optimization-ieee-2.c: New test case
> > > >         * lib/gcc-dg.exp: Add new function scan-symbol-common, scan-symbol-yes,
> > > >         scan-symbol-no to scan a user defined symbol in final elf file
> > > >
> > > > BR,
> > > > Tony
> > > >
> > > > diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c
b/gcc/testsuite/gcc.target/arm/size-
> > > > optimization-ieee-1.c
> > > > new file mode 100644
> > > > index 0000000..46e9cdf
> > > > --- /dev/null
> > > > +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c
> > > > @@ -0,0 +1,30 @@
> > > > +/* { dg-do link { target { arm_thumb2_ok } } } */
> > > > +/* { dg-options "-Wl,--gc-sections" } */
> > > > +int
> > > > +foo ()
> > > > +{
> > > > +  volatile float a;
> > > > +  volatile float b;
> > > > +  volatile float c = a * b;
> > > > +  return 0;
> > > > +}
> > > > +
> > > > +int
> > > > +bar ()
> > > > +{
> > > > +  volatile double a;
> > > > +  volatile double b;
> > > > +  volatile double c = a * b;
> > > > +  return 0;
> > > > +}
> > > > +
> > > > +int
> > > > +main ()
> > > > +{
> > > > +  foo ();
> > > > +  bar ();
> > > > +  return 0;
> > > > +}
> > > > +/* { dg-final { scan-symbol-no "__aeabi_fdiv" } } */
> > > > +/* { dg-final { scan-symbol-no "__aeabi_ddiv" } } */
> > > > +
> > > > diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c
b/gcc/testsuite/gcc.target/arm/size-
> > > > optimization-ieee-2.c
> > > > new file mode 100644
> > > > index 0000000..5007d62
> > > > --- /dev/null
> > > > +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c
> > > > @@ -0,0 +1,30 @@
> > > > +/* { dg-do link { target { arm_thumb2_ok } } } */
> > > > +/* { dg-options "-Wl,--gc-sections" } */
> > > > +int
> > > > +foo ()
> > > > +{
> > > > +  volatile float a;
> > > > +  volatile float b;
> > > > +  volatile float c = a / b;
> > > > +  return 0;
> > > > +}
> > > > +
> > > > +int
> > > > +bar ()
> > > > +{
> > > > +  volatile double a;
> > > > +  volatile double b;
> > > > +  volatile double c = a / b;
> > > > +  return 0;
> > > > +}
> > > > +
> > > > +int
> > > > +main ()
> > > > +{
> > > > +  foo ();
> > > > +  bar ();
> > > > +  return 0;
> > > > +}
> > > > +/* { dg-final { scan-symbol-yes "__aeabi_fmul" } } */
> > > > +/* { dg-final { scan-symbol-yes "__aeabi_dmul" } } */
> > > > +
> > > > diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp
> > > > index 3390caa..0d52e95 100644
> > > > --- a/gcc/testsuite/lib/gcc-dg.exp
> > > > +++ b/gcc/testsuite/lib/gcc-dg.exp
> > > > @@ -880,5 +880,57 @@ proc gdb-exists { args } {
> > > >      return 0;
> > > >  }
> > > >
> > > > +# Scan the OUTPUT_FILE for a symbol. Return 1 if it present, or
> > > > +# return 0 if it doesn't present
> > > > +
> > > > +proc scan-symbol-common { args } {
> > > > +    global nm
> > > > +    global base_dir
> > > > +
> > > > +    set testcase [testname-for-summary]
> > > > +    set output_file "[file rootname [file tail $testcase]].exe"
> > > > +
> > > > +    # Find nm like we find g++ in g++.exp.
> > > > +    if ![info exists nm]  {
> > > > +        set nm [findfile $base_dir/../../../binutils/nm \
> > > > +                $base_dir/../../../binutils/nm \
> > > > +                [findfile $base_dir/../../nm $base_dir/../../nm \
> > > > +                      [findfile $base_dir/nm $base_dir/nm \
> > > > +                       [transform nm]]]]
> > > > +        verbose -log "nm is $nm"
> > > > +    }
> > > > +
> > > > +    if { $output_file == "" } {
> > > > +        fail "scan-symbol-not $args: dump file does not exist"
> > > > +        return
> > > > +    }
> > > > +
> > > > +    set fd [open "| $nm $output_file" r]
> > > > +    set text [read $fd]
> > > > +    close $fd
> > > > +
> > > > +    if [regexp -- [lindex $args 0] $text] {
> > > > +        return 1
> > > > +    } else {
> > > > +        return 0
> > > > +    }
> > > > +}
> > > > +
> > > > +proc scan-symbol-yes { args } {
> > > > +    if { [scan-symbol-common $args] == 1 } {
> > > > +	pass "scan-symbol-yes $args exists"
> > > > +    } else {
> > > > +	fail "scan-symbol-yes $args does not exist"
> > > > +    }
> > > > +}
> > > > +
> > > > +proc scan-symbol-no { args } {
> > > > +    if { [scan-symbol-common $args] != 1 } {
> > > > +        pass "scan-symbol-no $args does not exist"
> > > > +    } else {
> > > > +        fail "scan-symbol-no $args exists"
> > > > +    }
> > > > +}
> > > > +
> > > >  set additional_prunes ""
> > > >  set dg_runtest_extra_prunes ""





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