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lib1funcs.asm (___mulsi3): Use hardware multiply instructions for H8/300H case.

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* config/h8300/lib1funcs.asm (___mulsi3): Use hardware
	multiply instructions for H8/300H case.

From-SVN: r52558
This commit is contained in:
Toshiyasu Morita 2002-04-20 18:01:53 +00:00 committed by Kazu Hirata
parent b1113e0aac
commit 59184677f4
2 changed files with 44 additions and 22 deletions
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5
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@ -1,3 +1,8 @@
2002-04-20 Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com>
* config/h8300/lib1funcs.asm (___mulsi3): Use hardware
multiply instructions for H8/300H case.
2002-04-20 Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com>
* config/h8300/lib1funcs.asm (___cmpsi2, ___ucmpsi2):

61
gcc/config/h8300/lib1funcs.asm
View File

@ -730,32 +730,49 @@ _done:
#else /* __H8300H__ */
;
; mulsi3 for H8/300H - based on Hitachi SH implementation
;
; by Toshiyasu Morita
;
; Old code:
;
; 16b * 16b = 372 states (worst case)
; 32b * 32b = 724 states (worst case)
;
; New code:
;
; 16b * 16b = 68 states
; 16b * 32b = 96 states
; 32b * 32b = 124 states
;
.global ___mulsi3
___mulsi3:
sub.l A2P,A2P
push.l er3 ; (10 states)
mov.w r1,r2 ; ( 2 states) b * d
mulxu r0,er2 ; (22 states)
mov.w e0,r3 ; ( 2 states) a * d
beq L_skip1 ; ( 4 states)
mulxu r1,er3 ; (22 states)
mov.w r3,e3 ; ( 2 states)
mov.w #0,r3 ; ( 2 states)
add.l er3,er2 ; ( 2 states)
; while (a)
_top: mov.l A0P,A0P
beq _done
L_skip1:
mov.w e1,r3 ; ( 2 states) c * b
beq L_skip2 ; ( 4 states)
mulxu r0,er3 ; (22 states)
mov.w r3,e3 ; ( 2 states)
mov.w #0,r3 ; ( 2 states)
add.l er3,er2 ; ( 2 states)
; if (a & 1)
bld #0,A0L
bcc _nobit
; r += b
add.l A1P,A2P
_nobit:
; a >>= 1
shlr.l A0P
; b <<= 1
shll.l A1P
bra _top
_done:
mov.l A2P,A0P
rts
L_skip2:
mov.l er2,er0 ; ( 2 states)
pop.l er3 ; (10 states)
rts ; (10 states)
#endif
#endif /* L_mulsi3 */