char c;
void upcase() {
  if ((c>='a')&&(c<='z')) c=c-0x20;
}

gcc -S -b m6811 upcase.c

upcase:
        ldab    c
        cmpb    #96
        bls     .L2
        ldab    c
        cmpb    #122
        bhi     .L2
        ldab    c
        addb    #-32
        stab    c
.L2:
        rts


 
gcc -S -b m6811 upcase.c -O

upcase:
        ldab    c
        addb    #-97
        cmpb    #25
        bhi     .L2
        ldab    c
        addb    #-32
        stab    c
.L2:
        rts


bcc -S upcase.c

	mov     al,[_c]
	cmp     al,*$61
	jb      .1
.3:
	mov     al,[_c]
	cmp     al,*$7A
	ja      .1
.2:
	mov     al,[_c]
	xor     ah,ah
	add     ax,*-$20
	mov     [_c],al
.1:
	ret




in /usr/lib/bcc/i86/rules.86

# Rules for comparing short values

mov     %[ax|bx]3,%1[%4]
cmp     %[ax|bx]3,%[#|*]0%2
=
cmp     word ptr %1[%4],%0%2

mov     al,%1[%4]
cmp     al,%[#|*]0%2
=
cmp     byte ptr %1[%4],%0%2

mov     %[ax|bx]3,%[ax|bx|cx|dx|si|di]2
cmp     %[ax|bx]3,%1
=
cmp     %2,%1








bcc -S upcase.c -O

_upcase:
	cmp     byte ptr [_c],*$61
	jb      .1
.3:
	cmp     byte ptr [_c],*$7A
	ja      .1
.2:
	add     byte ptr [_c],*-$20
.1:
	ret


gcc -S -b m68k-motorola upcase.c
[4:56pm linserv] more upcase.s
        file    "upcase.c"
        text
        even
        global  upcase
upcase:
        pea (%fp)
        move.l %sp,%fp
        cmp.b c,&96
        ble L%L2
        cmp.b c,&122
        bgt L%L2
        add.b &-32,c
L%L2:
        unlk %fp
        rts
        comm c,1


gcc -S -b m68k-coff upcase.c
[4:58pm linserv] !mo
more upcase.s
        .file   "upcase.c"
        .text
        .even
        .globl  upcase
upcase:
        link.w %a6,#0
        cmp.b #96,c
        jble .L2
        cmp.b #122,c
        jbgt .L2
        add.b #-32,c
.L2:
        unlk %a6
        rts
.comm c,2

gcc -S -b m68k-motorola upcase.c -O
[5:07pm linserv] more upcase.s
        file    "upcase.c"
        text
        even
        global  upcase
upcase:
        pea (%fp)
        move.l %sp,%fp
        mov.b c,%d0
        add.b &-97,%d0
        cmp.b %d0,&25
        bhi L%L2
        add.b &-32,c
L%L2:
        unlk %fp
        rts
        comm c,1



gcc -S -b m68k-coff upcase.c -O
[8:21pm linserv] more upcase.s
        .file   "upcase.c"
        .text
        .even
        .globl  upcase
upcase:
        link.w %a6,#0
        move.b c,%d0
        add.b #-97,%d0
        cmp.b #25,%d0
        jbhi .L2
        add.b #-32,c
.L2:
        unlk %a6
        rts
.comm c,2


gcc -S -b i686-pc-linux-gnu upcase.c
[8:31pm linserv] more upcase.s
        .file   "upcase.c"
        .text
        .align 16
.globl upcase
        .type   upcase,@function
upcase:
        pushl   %ebp
        movl    %esp, %ebp
        cmpb    $96, c
        jle     .L2
        cmpb    $122, c
        jg      .L2
        subb    $32, c
.L2:
        popl    %ebp
        ret
.Lfe1:
        .size   upcase,.Lfe1-upcase
        .comm   c,1,1
        .ident  "GCC: (GNU) 3.0.3"


gcc -S -b i686-pc-linux-gnu upcase.c -O
[8:32pm linserv] mv upcase.s upcase.i686.O
[8:32pm linserv] more upcase.i686.O
        .file   "upcase.c"
        .text
        .align 16
.globl upcase
        .type   upcase,@function
upcase:
        pushl   %ebp
        movl    %esp, %ebp
        movzbl  c, %edx
        movb    %dl, %al
        subb    $97, %al
        cmpb    $25, %al
        ja      .L2
        addb    $65, %al
        movb    %al, c
.L2:
        popl    %ebp
        ret
.Lfe1:
        .size   upcase,.Lfe1-upcase
        .comm   c,1,1
        .ident  "GCC: (GNU) 3.0.3"