From: Craig St Jean <valiantsoul@earthlink.net>

Hello,
I just want to thank you for putting up your PPC Assembler section! I had learned x86 and MIPS assembler and always wanted to get into PPC however after getting stuck with IBMs code samples I just moved on to other things.

Trying to learn things, I've taken a common version of strlen and optimized it to be 8 lines vs 22 lines after converting to assembler!

(original):				(mine):
stmw    r30,0xfff8(r1)
stwu    r1,0xffc0(r1)
or      r30,r1,r1			or r2, r3, r3
stw     r3,0x58(r30)
lwz     r0,0x58(r30)
stw     r0,0x18(r30)
b       0x2ac4				b compare
0x2ab8:						loop:
lwz     r2,0x18(r30)
addi    r0,r2,0x1			addi r2, r2, 0x1
stw     r0,0x18(r30)
0x2ac4:						compare:
lwz     r2,0x18(r30)
lbz     r0,0x0(r2)			lbz r0, 0x0(r2)
extsb   r0,r0
cmpwi   cr7,r0,0x0			cmpwi cr7, r0, 0x0
bne     cr7,0x2ab8			bne cr7, loop
lwz     r2,0x18(r30)
lwz     r0,0x58(r30)
subf    r0,r0,r2			subf r3, r3, r2
or      r3,r0,r0
lwz     r1,0x0(r1)
lmw     r30,0xfff8(r1)
blr							blr

(C original):
int strlen(const char *x)
{
	const char *s;
	for (s = x; *s; s++);
	return s - x;
}