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cmd/compile: added some intrinsics to SSA back end

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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>
This commit is contained in:
David Chase 2016-03-11 00:10:52 -05:00
parent 2e90192b0e
commit 8eec2bbfbc
15 changed files with 1143 additions and 36 deletions
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11
src/cmd/compile/internal/ssa/gen/genericOps.go
View file

@ -237,6 +237,17 @@ var genericOps = []opData{
{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