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


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> -----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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