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in 13416:67c0b8c8fb29 "faster code, mainly for rotate" [1]. The codegen can run out of registers if there are too many small-int arithmetic ops. An alternative approach is to copy 6g's sbop/abop codegen to 8g, but this change is less risky. Fixes #3835. [1] http://code.google.com/p/go/source/diff?spec=svn67c0b8c8fb29b1b7b6221977af6b89cae787b941&name=67c0b8c8fb29&r=67c0b8c8fb29b1b7b6221977af6b89cae787b941&format=side&path=/src/cmd/8g/cgen.c R=rsc, remyoudompheng, r CC=golang-dev https://golang.org/cl/6450163
39 lines
916 B
Go
39 lines
916 B
Go
// run
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// Copyright 2012 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 3835: 8g tries to optimize arithmetic involving integer
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// constants, but can run out of registers in the process.
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package main
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var a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, A, B, C, D, E, F, G int
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func foo() int {
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return a + 1 + b + 2 + c + 3 + d + 4 + e + 5 + f + 6 + g + 7 + h + 8 + i + 9 + j + 10 +
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k + 1 + l + 2 + m + 3 + n + 4 + o + 5 + p + 6 + q + 7 + r + 8 + s + 9 + t + 10 +
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u + 1 + v + 2 + w + 3 + x + 4 + y + 5 + z + 6 + A + 7 + B + 8 + C + 9 + D + 10 +
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E + 1 + F + 2 + G + 3
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}
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func bar() int8 {
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var (
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W int16
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X int32
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Y int32
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Z int32
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)
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return int8(W+int16(X+3)+3) * int8(Y+3+Z*3)
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}
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func main() {
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if foo() == 0 {
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panic("foo")
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}
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if bar() == 0 {
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panic("bar")
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}
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}
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