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[dev.ssa] cmd/compile: store floats in AuxInt

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Store floats in AuxInt to reduce allocations.

Change-Id: I101e6322530b4a0b2ea3591593ad022c992e8df8
Reviewed-on: https://go-review.googlesource.com/14320
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Todd Neal 2015-09-04 06:33:56 -05:00
parent 991036aef3
commit 19447a66d6
9 changed files with 67 additions and 49 deletions
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22
src/cmd/compile/internal/ssa/cse.go
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@ -4,10 +4,7 @@
package ssa
import (
"math"
"sort"
)
import "sort"
// cse does common-subexpression elimination on the Function.
// Values are just relinked, nothing is deleted. A subsequent deadcode
@ -55,18 +52,11 @@ func cse(f *Func) {
arg1op = v.Args[1].Op
}
aux := v.Aux
auxInt := v.AuxInt
// -0 == 0, but aren't equivalent values so we use
// Float64bits to distinguish
if f, ok := aux.(float64); ok {
aux = nil
if auxInt != 0 {
v.Fatalf("float would clobber v.auxInt")
}
auxInt = int64(math.Float64bits(f))
}
k := key{v.Op, v.Type.String(), aux, auxInt, len(v.Args), bid, arg0op, arg1op}
// This assumes that floats are stored in AuxInt
// instead of Aux. If not, then we need to use the
// float bits as part of the key, otherwise since 0.0 == -0.0
// this would incorrectly treat 0.0 and -0.0 as identical values
k := key{v.Op, v.Type.String(), v.Aux, v.AuxInt, len(v.Args), bid, arg0op, arg1op}
m[k] = append(m[k], v)
}
}