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cmd/compile: fix typo in floating point rule

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Change-Id: Idfb64fcb26f48d5b70bab872f9a3d96a036be681
Reviewed-on: https://go-review.googlesource.com/63950
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 2017-09-14 19:47:18 -05:00
parent 5a986eca86
commit af86083812
3 changed files with 16 additions and 3 deletions
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13
src/cmd/compile/internal/gc/float_test.go
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@ -197,6 +197,16 @@ func cvt12(a float32) uint {
return uint(a)
}
//go:noinline
func f2i64p(v float64) *int64 {
return ip64(int64(v / 0.1))
}
//go:noinline
func ip64(v int64) *int64 {
return &v
}
func TestFloatConvert(t *testing.T) {
if got := cvt1(3.5); got != 3 {
t.Errorf("cvt1 got %d, wanted 3", got)
@ -234,6 +244,9 @@ func TestFloatConvert(t *testing.T) {
if got := cvt12(3.5); got != 3 {
t.Errorf("cvt12 got %d, wanted 3", got)
}
if got := *f2i64p(10); got != 100 {
t.Errorf("f2i64p got %d, wanted 100", got)
}
}
var sinkFloat float64

2
src/cmd/compile/internal/ssa/gen/generic.rules
View File

@ -53,7 +53,7 @@
(Cvt32Fto32 (Const32F [c])) -> (Const32 [int64(int32(i2f(c)))])
(Cvt32Fto64 (Const32F [c])) -> (Const64 [int64(i2f(c))])
(Cvt64Fto32 (Const64F [c])) -> (Const32 [int64(int32(i2f(c)))])
(Cvt64Fto64 (Const64F [c])) -> (Const32 [int64(i2f(c))])
(Cvt64Fto64 (Const64F [c])) -> (Const64 [int64(i2f(c))])
(Round32F x:(Const32F)) -> x
(Round64F x:(Const64F)) -> x

4
src/cmd/compile/internal/ssa/rewritegeneric.go
View File

@ -7194,14 +7194,14 @@ func rewriteValuegeneric_OpCvt64Fto32F_0(v *Value) bool {
func rewriteValuegeneric_OpCvt64Fto64_0(v *Value) bool {
// match: (Cvt64Fto64 (Const64F [c]))
// cond:
// result: (Const32 [int64(i2f(c))])
// result: (Const64 [int64(i2f(c))])
for {
v_0 := v.Args[0]
if v_0.Op != OpConst64F {
break
}
c := v_0.AuxInt
v.reset(OpConst32)
v.reset(OpConst64)
v.AuxInt = int64(i2f(c))
return true
}