96cdacb971
This change adds three new instructions: - LPDFR: load positive (math.Abs(x)) - LNDFR: load negative (-math.Abs(x)) - CPSDR: copy sign (math.Copysign(x, y)) By making use of GPR <-> FPR moves we can now compile math.Abs and math.Copysign to these instructions using SSA rules. This CL also adds new rules to merge address generation into combined load operations. This makes GPR <-> FPR move matching more reliable. name old time/op new time/op delta Copysign 1.85ns ± 0% 1.40ns ± 1% -24.65% (p=0.000 n=8+10) Abs 1.58ns ± 1% 0.73ns ± 1% -53.64% (p=0.000 n=10+10) The geo mean improvement for all math package benchmarks was 4.6%. Change-Id: I0cec35c5c1b3fb45243bf666b56b57faca981bc9 Reviewed-on: https://go-review.googlesource.com/73950 Run-TryBot: Michael Munday <mike.munday@ibm.com> Reviewed-by: Keith Randall <khr@golang.org> |
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