IA-64 Innovations

if-conversion: execute both sides of a branch

if(r1 == 0)

r2 = r3 + r3

else

r7 = r6 - r5

cmp.ne p1, p2 = r1, 0 ;; Set predicate reg

(p1) add r2 = r3, r4

(p2) sub r7 = r6,r5

data speculation: load a value before knowing if the address

is correct.

control speculation: Execute a computation before knowing

it it have to.

rotating registers: Support for software pipelining.