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cmd/compile: truncate constant arithmetic result with typed complex numbers
Fixes #33285 Change-Id: Idd125e3342058051216be3f105330aef987320c3 Reviewed-on: https://go-review.googlesource.com/c/go/+/187697 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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@ -1042,9 +1042,15 @@ func setconst(n *Node, v Val) {
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overflow(v, n.Type)
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lineno = lno
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// Truncate precision for non-ideal float.
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if v.Ctype() == CTFLT && n.Type.Etype != TIDEAL {
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n.SetVal(Val{truncfltlit(v.U.(*Mpflt), n.Type)})
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if !n.Type.IsUntyped() {
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switch v.Ctype() {
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// Truncate precision for non-ideal float.
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case CTFLT:
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n.SetVal(Val{truncfltlit(v.U.(*Mpflt), n.Type)})
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// Truncate precision for non-ideal complex.
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case CTCPLX:
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n.SetVal(Val{trunccmplxlit(v.U.(*Mpcplx), n.Type)})
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}
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}
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}
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@ -157,10 +157,49 @@ func interfaces() {
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"for interface{}==int comipiler == runtime")
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}
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// Test that typed floating-point and complex arithmetic
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// is computed with correct precision.
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func truncate() {
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const (
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x30 = 1 << 30
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x60 = 1 << 60
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staticF32 = float32(x30) + 1 - x30
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staticF64 = float64(x60) + 1 - x60
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staticC64 = complex64(x30) + 1 - x30
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staticC128 = complex128(x60) + 1 - x60
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)
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dynamicF32 := float32(x30)
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dynamicF32 += 1
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dynamicF32 -= x30
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dynamicF64 := float64(x60)
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dynamicF64 += 1
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dynamicF64 -= x60
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dynamicC64 := complex64(x30)
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dynamicC64 += 1
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dynamicC64 -= x30
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dynamicC128 := complex128(x60)
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dynamicC128 += 1
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dynamicC128 -= x60
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assert(staticF32 == 0, "staticF32 == 0")
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assert(staticF64 == 0, "staticF64 == 0")
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assert(dynamicF32 == 0, "dynamicF32 == 0")
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assert(dynamicF64 == 0, "dynamicF64 == 0")
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assert(staticC64 == 0, "staticC64 == 0")
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assert(staticC128 == 0, "staticC128 == 0")
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assert(dynamicC64 == 0, "dynamicC64 == 0")
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assert(dynamicC128 == 0, "dynamicC128 == 0")
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}
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func main() {
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ints()
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floats()
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interfaces()
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truncate()
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assert(ctrue == true, "ctrue == true")
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assert(cfalse == false, "cfalse == false")
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