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cmd/compile: const folding for float32/64

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Split the auxFloat type into 32/64 bit versions and perform checking for
exactly representable float32 values.  Perform const folding on
float32/64.  Comment out some const negation rules that the frontend
already performs.

Change-Id: Ib3f8d59fa8b30e50fe0267786cfb3c50a06169d2
Reviewed-on: https://go-review.googlesource.com/20568
Run-TryBot: Todd Neal <todd@tneal.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Todd Neal 2016-03-11 19:36:54 -06:00
parent cd798dcb88
commit f6ceed2cab
10 changed files with 232 additions and 69 deletions
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2
src/cmd/compile/internal/ssa/func.go
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@ -341,7 +341,7 @@ func (f *Func) ConstInt64(line int32, t Type, c int64) *Value {
return f.constVal(line, OpConst64, t, c, true)
}
func (f *Func) ConstFloat32(line int32, t Type, c float64) *Value {
return f.constVal(line, OpConst32F, t, int64(math.Float64bits(c)), true)
return f.constVal(line, OpConst32F, t, int64(math.Float64bits(float64(float32(c)))), true)
}
func (f *Func) ConstFloat64(line int32, t Type, c float64) *Value {
return f.constVal(line, OpConst64F, t, int64(math.Float64bits(c)), true)