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In some optimization rules the type of generated OffPtr was incorrectly set to the type of the pointee, instead of the pointer. When the OffPtr value is spilled, this may generate a spill of the wrong type, e.g. a floating point spill of an integer (pointer) value. On Wasm, this leads to invalid bytecode. Fixes #27961. Change-Id: I5d464847eb900ed90794105c0013a1a7330756cc Reviewed-on: https://go-review.googlesource.com/c/139257 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Richard Musiol <neelance@gmail.com>
36 lines
596 B
Go
36 lines
596 B
Go
// run
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 27961: some optimizations generate OffPtr with wrong
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// types, which causes invalid bytecode on Wasm.
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package main
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import "math"
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type Vec2 [2]float64
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func main() {
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var a Vec2
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a.A().B().C().D()
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}
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func (v Vec2) A() Vec2 {
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return Vec2{v[0], v[0]}
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}
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func (v Vec2) B() Vec2 {
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return Vec2{1.0 / v.D(), 0}
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}
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func (v Vec2) C() Vec2 {
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return Vec2{v[0], v[0]}
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}
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func (v Vec2) D() float64 {
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return math.Sqrt(v[0])
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}
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