AMD 250 manual 182

Software Optimization Guide for AMD64 Processors 25112 Rev. 3.06 September 2005

shr	eax, 30	;	converting it into
lea	ebx, [eax+edx*4+1]	;	17.15 fixed-point format
mov	ecx, ebx	; such that 1.0 = 2^15.
mov	eax, 0xD1B71759	; 2^15 / 1e4 * 2^30
mul	esi	; Divide y2 by 1e4,
shr	eax, 30	;	converting it into
lea	esi, [eax+edx*4+1]	;	17.15 fixed-point format
mov	edx, esi	; such that 1.0 = 2^15.
shr	ecx, 15	; 1st		digit
and	ebx, 0x00007fff	; Fraction part
OR	ecx, '0'	; Convert 1st digit			to ASCII.
mov	[edi+0], cl	; Store 1st digit in memory.
lea	ecx, [ebx+ebx*4]	; 5 *		fraction, new	digit ECX[31-14]
lea	ebx, [ebx+ebx*4]	; 5 *		fraction, new	fraction EBX[13-0]
shr	edx, 15	; 6th		digit
and	esi, 0x00007fff	; Fraction part
or	edx, '0'	; Convert 6th digit			to ASCII.
mov	[edi+5], dl	; Store 6th digit in memory.
lea	edx, [esi+esi*4]	; 5 *		fraction, new	digit EDX[31-14]
lea	esi, [esi+esi*4]	; 5 *		fraction, new	fraction ESI[13-0]
shr	ecx, 14	; 2nd		digit
and	ebx, 0x00003fff	; Fraction part
or	ecx, '0'	; Convert 2nd digit			to ASCII.
mov	[edi+1], cl	; Store 2nd digit in memory.
lea	ecx, [ebx+ebx*4]	; 5 *f raction, new			digit ECX[31-13]
lea	ebx, [ebx+ebx*4]	; 5 *		fraction, new	fraction EBX[12-0]
shr	edx, 14	; 7th		digit
and	esi, 0x00003fff	; Fraction part
or	edx, '0'	; Convert 7th digit			to ASCII.
mov	[edi+6], dl	; Store 7th digit in memory.
lea	edx, [esi+esi*4]	; 5 *		fraction, new	digit EDX[31-13]
lea	esi, [esi+esi*4]	; 5 *		fraction, new	fraction ESI[12-0]
shr	ecx, 13	; 3rd		digit
and	ebx, 0x00001fff	; Fraction part
or	ecx, '0'	; Convert 3rd digit			to ASCII.
mov	[edi+2], cl	; Store 3rd digit in memory.
lea	ecx, [ebx+ebx*4]	; 5 *		fraction, new	digit ECX[31-12]
lea	ebx, [ebx+ebx*4]	; 5 *		fraction, new	fraction EBX[11-0]
shr	edx, 13	; 8th		digit
and	esi, 0x00001fff	; Fraction part
or	edx, '0'	; Convert 8th digit			to ASCII.
mov	[edi+7], dl	; Store 8th digit in memory.
lea	edx, [esi+esi*4]	; 5 *		fraction, new	digit EDX[31-12]
lea	esi, [esi+esi*4]	; 5 *		fraction, new	fraction ESI[11-0]
shr	ecx, 12	; 4th		digit
and	ebx, 0x00000fff	; Fraction part
or	ecx, '0'	; Convert 4th digit			to ASCII.
mov	[edi+3], cl	; Store 4th digit in memory.
lea	ecx, [ebx+ebx*4]	; 5 *		fraction, new	digit ECX[31-11]
shr	edx, 12	; 9th		digit
and	esi, 0x00000fff	; Fraction part

182 Integer Optimizations Chapter 8