Hi,
I've been playing around with SDCC for about a week now and overall I'm
impressed and positively surpriced.
However, I was slightly disappointed in the code generated, based on
the few peeks I had at the generated code.
This is HC08 which I'm talking about, which is, if I understand
correctly, rather a resent port,
so I understand that it is early days yet.
My simple litle function:
static char* bf;
static void out(char c) {
*bf++ = c;
}
compiled into:
89 ;printf.c:37: static void out(char c) {
90
; -----------------------------------------
91 ; function out
92
; -----------------------------------------
E051 93 _out:
E051 C7 00 98 94 sta _out_c_1_1
95 ;printf.c:38: *bf++ = c;
E054 C6 00 87 96 lda _bf
E057 B7 85 97 sta *_out_sloc0_1_0
E059 C6 00 88 98 lda (_bf + 1)
E05C B7 86 99 sta *(_out_sloc0_1_0 + 1)
E05E 55 85 100 ldhx *_out_sloc0_1_0
E060 C6 00 98 101 lda _out_c_1_1
E063 F7 102 sta ,x
E064 B6 86 103 lda *(_out_sloc0_1_0 + 1)
E066 AB 01 104 add #0x01
E068 C7 00 88 105 sta (_bf + 1)
E06B B6 85 106 lda *_out_sloc0_1_0
E06D A9 00 107 adc #0x00
E06F C7 00 87 108 sta _bf
E072 109 00101$:
E072 81 110 rts
where as I was expecting something along the lines:
ldxh _bf
sta ,x
aix #1
stxh _bf
rts
Please don't get me wrong, I'm not critizing but more interested in
weather
this is going to improve and if so, what sort of time span we are
talking
about?
Is anyone specifically working on this (HC08 port)?
I've writen one or two compilers and assemblers myself so I
know getting the compiler to produce efficient code for small cpus is
not trivial.
br Kusti
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