ia64/lib/strlen.S

13  * Copyright (C) 1999, 2001 Hewlett-Packard Co
30 //	  string may not be 8-byte aligned. In this case we load the 8byte
42 //	  The fact that speculation may fail can be caused, for instance, by
53 //	- the cmp r0,r0 is used as a fast way to initialize a predicate
57 //	- we don't use the epilogue counter to exit the loop but we need to set
60 //	- after the loop we must test for Nat values because neither the
66 //	- Clearly performance tuning is required.
90 	dep src=0,in0,0,3	// src=8byte-aligned in0 address
97 	ld8 v[1]=[src],8	// must not speculate: can fail here
99 	mov mask=-1		// our mask
108 	add base=-16,src	// keep track of aligned base
126 	//	- there must be a better way of doing the test
140 (p8)	adds src=-16,src	// correct position when 3 ahead
141 (p9)	adds src=-24,src	// correct position when 4 ahead
161 	// supposed to fail. If that happens it means we have a bug and the
165 	//	- today we restart from the beginning of the string instead
169 	ld8 val=[base],8	// will fail if unrecoverable fault
178 (p6)	ld8 val=[base],8	// will fail if unrecoverable fault
189 	sub ret0=ret0,tmp	// length=now - back -1