11.05.11, 00:28, "David Miller" <davem@xxxxxxxxxxxxx>: >I don't understand why you're testing "andcc %o3, %o0, %g0", as %o3 has >the value computed in "srl %g1, 1, %o3" here. >What is so interesting about "ptr & (length >> 1)"? 1)Label ccte (rather, cc_end_cruft) copies data sequentially by pieces of length 2^x bytes from biggest to smallest. For example, if %g1 is 15, then the label copies 8+4+2+1=15, and %o0 must be aligned to 8. Let alignment a = 2^x. Pointer ptr % a == 0 when: ptr & (a >> 1) == 0 ptr & (a >> 2) == 0 .. Or, what is the same: ptr & (length >> 1) == 0 ptr & (length >> 2) == 0 .. I.e. we are looking for right alignment, if another case don't call ccte. 2)We check %o0 only, because %o1 has the same last two bits, and cc_end_cruft writes 4 bytes or less. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
