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From: Greg Colvin (gcolvin_at_[hidden])
Date: 2001-10-23 12:53:01

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Previous message: Greg Colvin: "Re: [boost] Math constants for naive and gurus? - which constants do you want?"
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Reply: Greg Colvin: "Re: [boost] Math constants for naive and gurus? - which constants do you want?"

Here is GCC on Sparc. Sun's CC 4.0 chokes on the first template.

        .file "pi_test.cpp"
gcc2_compiled.:
.section ".text"
        .align 4
        .global pi_test__Fv
        .type pi_test__Fv,#function
        .proc 04
pi_test__Fv:
.LLFB1:
        !#PROLOGUE# 0
        save %sp, -152, %sp
.LLCFI0:
        !#PROLOGUE# 1
        sethi %hi(1074339840), %o0
        sethi %hi(1413753856), %o1
        or %o0, 507, %o0
        or %o1, 280, %o1
        std %o0, [%fp-56]
        std %o0, [%fp-24]
        std %o0, [%fp-32]
        std %o0, [%fp-40]
        std %o0, [%fp-48]
        add %fp, -24, %o0
        add %fp, -32, %o1
        add %fp, -40, %o2
        add %fp, -48, %o3
        call f__FRdN40, 0
        add %fp, -56, %o4
        ret
        restore %g0, %o0, %o0
.LLFE1:
.LLfe1:
        .size pi_test__Fv,.LLfe1-pi_test__Fv

.section ".eh_frame",#alloc,#write
__FRAME_BEGIN__:
        .uaword .LLECIE1-.LLSCIE1
.LLSCIE1:
        .uaword 0x0
        .byte 0x1
        .byte 0x0
        .byte 0x1
        .byte 0x7c
        .byte 0x65
        .byte 0xc
        .byte 0xe
        .byte 0x0
        .byte 0x9
        .byte 0x65
        .byte 0xf
        .align 4
.LLECIE1:
        .uaword .LLEFDE1-.LLSFDE1
.LLSFDE1:
        .uaword .LLSFDE1-__FRAME_BEGIN__
        .uaword .LLFB1
        .uaword .LLFE1-.LLFB1
        .byte 0x4
        .uaword .LLCFI0-.LLFB1
        .byte 0xd
        .byte 0x1e
        .byte 0x2d
        .byte 0x9
        .byte 0x65
        .byte 0x1f
        .align 4
.LLEFDE1:
        .ident "GCC: (GNU) 2.95.2 19991024 (release)"

From: Greg Colvin <gcolvin_at_[hidden]>
> From: Paul A. Bristow <boost_at_[hidden]>
> > Thanks for this - agrees with my naiver tests.
> >
> > It looks promising to me - but what of other compilers - you gcc fans etc?
>
> .file "pi_test.cc"
> gcc2_compiled.:
> ___gnu_compiled_cplusplus:
> .text
> .align 8
> LC3:
> .long 0x54442d18,0x400921fb
> .align 4
> .globl _pi_test__Fv
> .def _pi_test__Fv; .scl 2; .type 32; .endef
> _pi_test__Fv:
> fldl LC3
> pushl %ebp
> movl %esp,%ebp
> subl $48,%esp
> fstl -40(%ebp)
> fstl -32(%ebp)
> fstl -24(%ebp)
> fstl -16(%ebp)
> fstpl -8(%ebp)
> leal -8(%ebp),%eax
> pushl %eax
> leal -16(%ebp),%eax
> pushl %eax
> leal -24(%ebp),%eax
> pushl %eax
> leal -32(%ebp),%eax
> pushl %eax
> leal -40(%ebp),%eax
> pushl %eax
> call _f__FRdN40
> movl %ebp,%esp
> popl %ebp
> ret
> .def _f__FRdN40; .scl 2; .type 32; .endef
>
>
> > Paul
> >
> > > -----Original Message-----
> > > From: Greg Colvin [mailto:gcolvin_at_[hidden]]
> > > Sent: Tuesday, October 23, 2001 5:44 PM
> > > To: boost_at_[hidden]
> > > Subject: Re: [boost] Math constants for naive and gurus? - which
> > > constants do you want?
> > >
> > >
> > > For what it is worth, appendedis a very simple test program and
> > > the 80x86 assembly language output from MSVC. I had to add the
> > > call to f(double&,double&,double&,double&,double&) to prevent the
> > > optimizer removing almost all the code. The operations for each
> > > way of assigning pi to a local are a bit scrambled up, I assume
> > > for optimal scheduling. When I unscamble them they look like:
> > >
> > > ; double pi_template = constant<pi_tag,double>();
> > > mov DWORD PTR _pi_template$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_template$[esp+64], 1074340347 ; 400921fbH
> > >
> > > ; double pi_function = pi();
> > >
> > > mov DWORD PTR _pi_function$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_function$[esp+64], 1074340347 ; 400921fbH
> > >
> > > ; double pi_constant = Pi;
> > > mov eax, DWORD PTR _Pi$S188
> > > mov DWORD PTR _pi_constant$[esp+40], eax
> > > mov ecx, DWORD PTR _Pi$S188+4
> > > mov DWORD PTR _pi_constant$[esp+52], ecx
> > >
> > > ; double pi_defined = PI;
> > > mov DWORD PTR _pi_defined$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_defined$[esp+64], 1074340347 ; 400921fbH
> > >
> > > ; double pi_literal = 3.141592653589793238462643383279502884197;
> > > mov DWORD PTR _pi_literal$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_literal$[esp+64], 1074340347 ; 400921fbH
> > >
> > > ; return f(pi_template,pi_function,pi_constant,pi_defined,pi_literal);
> > > lea edx, DWORD PTR _pi_literal$[esp+40]
> > > push edx
> > > lea eax, DWORD PTR _pi_defined$[esp+44]
> > > push eax
> > > lea ecx, DWORD PTR _pi_constant$[esp+48]
> > > push ecx
> > > lea edx, DWORD PTR _pi_function$[esp+52]
> > > push edx
> > > lea eax, DWORD PTR _pi_template$[esp+56]
> > > push eax
> > > call ?f@@YAHAAN0000_at_Z ; f
> > >
> > > Make of it all what you will.
> > >
> > >
> > > //////////////////////////////////////////////////////////////////
> > > // pi_test.cpp
> > >
> > > template <typename Tag, typename Rep> struct constant {
> > > constant() {}
> > > operator Rep() const;
> > > };
> > >
> > > struct pi_tag {};
> > >
> > > template<> inline constant<pi_tag, double>::operator double() const {
> > > return 3.141592653589793238462643383279502884197;
> > > }
> > >
> > > inline double pi() {
> > > return 3.141592653589793238462643383279502884197;
> > > }
> > >
> > > const double Pi = 3.141592653589793238462643383279502884197;
> > >
> > > #define PI 3.141592653589793238462643383279502884197
> > >
> > > extern int f(double&,double&,double&,double&,double&);
> > >
> > > int pi_test() {
> > >
> > > double pi_template = constant<pi_tag,double>();
> > >
> > > double pi_function = pi();
> > >
> > > double pi_constant = Pi;
> > >
> > > double pi_defined = PI;
> > >
> > > double pi_literal = 3.141592653589793238462643383279502884197;
> > >
> > > return f(pi_template,pi_function,pi_constant,pi_defined,pi_literal);
> > > }
> > >
> > >
> > > ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> > > TITLE pi_test.cpp
> > > .386P
> > > include listing.inc
> > > if @Version gt 510
> > > .model FLAT
> > > else
> > > _TEXT SEGMENT PARA USE32 PUBLIC 'CODE'
> > > _TEXT ENDS
> > > _DATA SEGMENT DWORD USE32 PUBLIC 'DATA'
> > > _DATA ENDS
> > > CONST SEGMENT DWORD USE32 PUBLIC 'CONST'
> > > CONST ENDS
> > > _BSS SEGMENT DWORD USE32 PUBLIC 'BSS'
> > > _BSS ENDS
> > > _TLS SEGMENT DWORD USE32 PUBLIC 'TLS'
> > > _TLS ENDS
> > > ; COMDAT ??B?$constant_at_Upi_tag@@N@@QBENXZ
> > > _TEXT SEGMENT PARA USE32 PUBLIC 'CODE'
> > > _TEXT ENDS
> > > ; COMDAT ?pi@@YANXZ
> > > _TEXT SEGMENT PARA USE32 PUBLIC 'CODE'
> > > _TEXT ENDS
> > > ; COMDAT ??0?$constant_at_Upi_tag@@N@@QAE_at_XZ
> > > _TEXT SEGMENT PARA USE32 PUBLIC 'CODE'
> > > _TEXT ENDS
> > > FLAT GROUP _DATA, CONST, _BSS
> > > ASSUME CS: FLAT, DS: FLAT, SS: FLAT
> > > endif
> > > CONST SEGMENT
> > > _Pi$S188 DQ 0400921fb54442d18r ; 3.14159
> > > CONST ENDS
> > > PUBLIC ?pi_test@@YAHXZ ; pi_test
> > > EXTRN ?f@@YAHAAN0000_at_Z:NEAR ; f
> > > EXTRN __fltused:NEAR
> > > CONST SEGMENT
> > > $T214 DQ 0400921fb54442d18r ; 3.14159
> > > CONST ENDS
> > > _TEXT SEGMENT
> > > _pi_template$ = -8
> > > _pi_function$ = -16
> > > _pi_constant$ = -24
> > > _pi_defined$ = -32
> > > _pi_literal$ = -40
> > > ?pi_test@@YAHXZ PROC NEAR ; pi_test
> > >
> > > ; 25 : int pi_test() {
> > >
> > > sub esp, 40 ; 00000028H
> > >
> > > ; 26 :
> > > ; 27 : double pi_template = constant<pi_tag,double>();
> > > ; 28 :
> > > ; 29 : double pi_function = pi();
> > > ; 30 :
> > > ; 31 : double pi_constant = Pi;
> > >
> > > mov eax, DWORD PTR _Pi$S188
> > > mov ecx, DWORD PTR _Pi$S188+4
> > > mov DWORD PTR _pi_constant$[esp+40], eax
> > >
> > > ; 32 :
> > > ; 33 : double pi_defined = PI;
> > > ; 34 :
> > > ; 35 : double pi_literal =
> > > 3.141592653589793238462643383279502884197;
> > > ; 36 :
> > > ; 37 : return
> > > f(pi_template,pi_function,pi_constant,pi_defined,pi_literal);
> > >
> > > lea edx, DWORD PTR _pi_literal$[esp+40]
> > > mov DWORD PTR _pi_constant$[esp+44], ecx
> > > lea eax, DWORD PTR _pi_defined$[esp+40]
> > > push edx
> > > lea ecx, DWORD PTR _pi_constant$[esp+44]
> > > push eax
> > > lea edx, DWORD PTR _pi_function$[esp+48]
> > > push ecx
> > > lea eax, DWORD PTR _pi_template$[esp+52]
> > > push edx
> > > push eax
> > > mov DWORD PTR _pi_template$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_template$[esp+64], 1074340347 ; 400921fbH
> > > mov DWORD PTR _pi_function$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_function$[esp+64], 1074340347 ; 400921fbH
> > > mov DWORD PTR _pi_defined$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_defined$[esp+64], 1074340347 ; 400921fbH
> > > mov DWORD PTR _pi_literal$[esp+60], 1413754136 ; 54442d18H
> > > mov DWORD PTR _pi_literal$[esp+64], 1074340347 ; 400921fbH
> > > call ?f@@YAHAAN0000_at_Z ; f
> > > add esp, 20 ; 00000014H
> > >
> > > ; 38 : }
> > >
> > > add esp, 40 ; 00000028H
> > > ret 0
> > > ?pi_test@@YAHXZ ENDP ; pi_test
> > > _TEXT ENDS
> > > END
> > >
> > >
> > >
> > >
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In reply to: Greg Colvin: "Re: [boost] Math constants for naive and gurus? - which constants do you want?"
Next in thread: Greg Colvin: "Re: [boost] Math constants for naive and gurus? - which constants do you want?"
Reply: Greg Colvin: "Re: [boost] Math constants for naive and gurus? - which constants do you want?"

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