cmd/compile: added some intrinsics to SSA back end
One intrinsic was needed to help get the very best
performance out of a future GC; as long as that one was
being added, I also added Bswap since that is sometimes
a handy thing to have. I had intended to fill out the
bit-scan intrinsic family, but the mismatch between the
"scan forward" instruction and "count leading zeroes"
was large enough to cause me to leave it out -- it poses
a dilemma that I'd rather dodge right now.
These intrinsics are not exposed for general use.
That's a separate issue requiring an API proposal change
( https://github.com/golang/proposal )
All intrinsics are tested, both that they are substituted
on the appropriate architecture, and that they produce the
expected result.
Change-Id: I5848037cfd97de4f75bdc33bdd89bba00af4a8ee
Reviewed-on: https://go-review.googlesource.com/20564
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/cmd/compile/internal/ssa/gen/genericOps.go b/src/cmd/compile/internal/ssa/gen/genericOps.go
index ab5e335..6d92926 100644
--- a/src/cmd/compile/internal/ssa/gen/genericOps.go
+++ b/src/cmd/compile/internal/ssa/gen/genericOps.go
@@ -237,6 +237,17 @@
{name: "Com32", argLength: 1},
{name: "Com64", argLength: 1},
+ {name: "Ctz16", argLength: 1}, // Count trailing (low order) zeroes (returns 0-16)
+ {name: "Ctz32", argLength: 1}, // Count trailing zeroes (returns 0-32)
+ {name: "Ctz64", argLength: 1}, // Count trailing zeroes (returns 0-64)
+
+ {name: "Clz16", argLength: 1}, // Count leading (high order) zeroes (returns 0-16)
+ {name: "Clz32", argLength: 1}, // Count leading zeroes (returns 0-32)
+ {name: "Clz64", argLength: 1}, // Count leading zeroes (returns 0-64)
+
+ {name: "Bswap32", argLength: 1}, // Swap bytes
+ {name: "Bswap64", argLength: 1}, // Swap bytes
+
{name: "Sqrt", argLength: 1}, // sqrt(arg0), float64 only
// Data movement, max argument length for Phi is indefinite so just pick
