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cmd/compile: clean up ctz ops

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Now that we have ops that can return 2 results, have BSF return a result
and flags.  We can then get rid of the redundant comparison and use CMOV
instead of CMOVconst ops.

Get rid of a bunch of the ops we don't use.  Ctz{8,16}, plus all the Clzs,
and CMOVNEs.  I don't think we'll ever use them, and they would be easy
to add back if needed.

Change-Id: I8858a1d017903474ea7e4002fc76a6a86e7bd487
Reviewed-on: https://go-review.googlesource.com/27630
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Keith Randall 2016-08-23 10:43:47 -07:00
parent 6394eb378e
commit 3e270ab80b
12 changed files with 71 additions and 650 deletions
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7
src/cmd/compile/internal/ssa/gen/genericOps.go
View file

@ -257,14 +257,9 @@ 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: "Ctz32", argLength: 1}, // Count trailing (low order) 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