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cmd/compile, cmd/cgo: align complex{64,128} like GCC

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complex64 and complex128 are treated like [2]float32 and [2]float64,
so it makes sense to align them the same way.

Change-Id: Ic614bcdcc91b080aeb1ad1fed6fc15ba5a2971f8
Reviewed-on: https://go-review.googlesource.com/19800
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Matthew Dempsky 2016-02-21 02:28:37 -08:00
parent 30088ac9a3
commit f54c0db859
4 changed files with 32 additions and 4 deletions
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24
misc/cgo/test/complex.go Normal file
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@ -0,0 +1,24 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cgotest
/*
struct {
float x;
_Complex float y;
} cplxAlign = { 3.14, 2.17 };
*/
import "C"
import "testing"
func TestComplexAlign(t *testing.T) {
if C.cplxAlign.x != 3.14 {
t.Errorf("got %v, expected 3.14", C.cplxAlign.x)
}
if C.cplxAlign.y != 2.17 {
t.Errorf("got %v, expected 2.17", C.cplxAlign.y)
}
}

2
src/cmd/cgo/gcc.go
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@ -1641,7 +1641,7 @@ func (c *typeConv) Type(dtype dwarf.Type, pos token.Pos) *Type {
case 16:
t.Go = c.complex128
}
if t.Align = t.Size; t.Align >= c.ptrSize {
if t.Align = t.Size / 2; t.Align >= c.ptrSize {
t.Align = c.ptrSize
}

4
src/cmd/cgo/out.go
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@ -1232,8 +1232,8 @@ var goTypes = map[string]*Type{
"uint64": {Size: 8, Align: 8, C: c("GoUint64")},
"float32": {Size: 4, Align: 4, C: c("GoFloat32")},
"float64": {Size: 8, Align: 8, C: c("GoFloat64")},
"complex64": {Size: 8, Align: 8, C: c("GoComplex64")},
"complex128": {Size: 16, Align: 16, C: c("GoComplex128")},
"complex64": {Size: 8, Align: 4, C: c("GoComplex64")},
"complex128": {Size: 16, Align: 8, C: c("GoComplex128")},
}
// Map an ast type to a Type.

6
src/cmd/compile/internal/gc/align.go
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@ -169,10 +169,14 @@ func dowidth(t *Type) {
case TINT32, TUINT32, TFLOAT32:
w = 4
case TINT64, TUINT64, TFLOAT64, TCOMPLEX64:
case TINT64, TUINT64, TFLOAT64:
w = 8
t.Align = uint8(Widthreg)
case TCOMPLEX64:
w = 8
t.Align = 4
case TCOMPLEX128:
w = 16
t.Align = uint8(Widthreg)