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![Josh Bleecher Snyder](/assets/img/avatar_default.png)
Change-Id: I8b462e20064658120afc8eb1cbac926254d1e24e Reviewed-on: https://go-review.googlesource.com/114937 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
271 lines
5.6 KiB
Go
271 lines
5.6 KiB
Go
// errorcheck -0 -m -l
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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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// Test, using compiler diagnostic flags, that bounds check elimination
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// is eliminating the correct checks.
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package foo
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var (
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s []int
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a1 [1]int
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a1k [1000]int
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a100k [100000]int
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p1 *[1]int
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p1k *[1000]int
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p100k *[100000]int
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i int
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ui uint
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i8 int8
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ui8 uint8
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i16 int16
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ui16 uint16
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i32 int32
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ui32 uint32
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i64 int64
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ui64 uint64
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)
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func main() {
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// Most things need checks.
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use(s[i])
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use(a1[i])
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use(a1k[i])
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use(a100k[i])
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use(p1[i])
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use(p1k[i])
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use(p100k[i])
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use(s[ui])
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use(a1[ui])
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use(a1k[ui])
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use(a100k[ui])
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use(p1[ui])
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use(p1k[ui])
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use(p100k[ui])
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use(s[i8])
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use(a1[i8])
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use(a1k[i8])
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use(a100k[i8])
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use(p1[i8])
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use(p1k[i8])
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use(p100k[i8])
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// Unsigned 8-bit numbers don't need checks for len >= 2⁸.
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use(s[ui8])
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use(a1[ui8])
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use(a1k[ui8]) // ERROR "index bounds check elided"
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use(a100k[ui8]) // ERROR "index bounds check elided"
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use(p1[ui8])
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use(p1k[ui8]) // ERROR "index bounds check elided"
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use(p100k[ui8]) // ERROR "index bounds check elided"
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use(s[i16])
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use(a1[i16])
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use(a1k[i16])
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use(a100k[i16])
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use(p1[i16])
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use(p1k[i16])
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use(p100k[i16])
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// Unsigned 16-bit numbers don't need checks for len >= 2¹⁶.
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use(s[ui16])
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use(a1[ui16])
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use(a1k[ui16])
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use(a100k[ui16]) // ERROR "index bounds check elided"
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use(p1[ui16])
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use(p1k[ui16])
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use(p100k[ui16]) // ERROR "index bounds check elided"
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use(s[i32])
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use(a1[i32])
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use(a1k[i32])
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use(a100k[i32])
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use(p1[i32])
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use(p1k[i32])
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use(p100k[i32])
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use(s[ui32])
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use(a1[ui32])
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use(a1k[ui32])
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use(a100k[ui32])
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use(p1[ui32])
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use(p1k[ui32])
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use(p100k[ui32])
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use(s[i64])
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use(a1[i64])
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use(a1k[i64])
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use(a100k[i64])
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use(p1[i64])
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use(p1k[i64])
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use(p100k[i64])
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use(s[ui64])
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use(a1[ui64])
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use(a1k[ui64])
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use(a100k[ui64])
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use(p1[ui64])
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use(p1k[ui64])
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use(p100k[ui64])
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// Mod truncates the maximum value to one less than the argument,
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// but signed mod can be negative, so only unsigned mod counts.
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use(s[i%999])
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use(a1[i%999])
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use(a1k[i%999])
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use(a100k[i%999])
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use(p1[i%999])
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use(p1k[i%999])
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use(p100k[i%999])
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use(s[ui%999])
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use(a1[ui%999])
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use(a1k[ui%999]) // ERROR "index bounds check elided"
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use(a100k[ui%999]) // ERROR "index bounds check elided"
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use(p1[ui%999])
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use(p1k[ui%999]) // ERROR "index bounds check elided"
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use(p100k[ui%999]) // ERROR "index bounds check elided"
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use(s[i%1000])
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use(a1[i%1000])
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use(a1k[i%1000])
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use(a100k[i%1000])
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use(p1[i%1000])
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use(p1k[i%1000])
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use(p100k[i%1000])
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use(s[ui%1000])
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use(a1[ui%1000])
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use(a1k[ui%1000]) // ERROR "index bounds check elided"
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use(a100k[ui%1000]) // ERROR "index bounds check elided"
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use(p1[ui%1000])
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use(p1k[ui%1000]) // ERROR "index bounds check elided"
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use(p100k[ui%1000]) // ERROR "index bounds check elided"
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use(s[i%1001])
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use(a1[i%1001])
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use(a1k[i%1001])
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use(a100k[i%1001])
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use(p1[i%1001])
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use(p1k[i%1001])
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use(p100k[i%1001])
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use(s[ui%1001])
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use(a1[ui%1001])
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use(a1k[ui%1001])
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use(a100k[ui%1001]) // ERROR "index bounds check elided"
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use(p1[ui%1001])
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use(p1k[ui%1001])
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use(p100k[ui%1001]) // ERROR "index bounds check elided"
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// Bitwise and truncates the maximum value to the mask value.
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// The result (for a positive mask) cannot be negative, so elision
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// applies to both signed and unsigned indexes.
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use(s[i&999])
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use(a1[i&999])
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use(a1k[i&999]) // ERROR "index bounds check elided"
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use(a100k[i&999]) // ERROR "index bounds check elided"
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use(p1[i&999])
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use(p1k[i&999]) // ERROR "index bounds check elided"
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use(p100k[i&999]) // ERROR "index bounds check elided"
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use(s[ui&999])
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use(a1[ui&999])
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use(a1k[ui&999]) // ERROR "index bounds check elided"
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use(a100k[ui&999]) // ERROR "index bounds check elided"
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use(p1[ui&999])
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use(p1k[ui&999]) // ERROR "index bounds check elided"
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use(p100k[ui&999]) // ERROR "index bounds check elided"
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use(s[i&1000])
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use(a1[i&1000])
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use(a1k[i&1000])
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use(a100k[i&1000]) // ERROR "index bounds check elided"
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use(p1[i&1000])
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use(p1k[i&1000])
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use(p100k[i&1000]) // ERROR "index bounds check elided"
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use(s[ui&1000])
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use(a1[ui&1000])
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use(a1k[ui&1000])
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use(a100k[ui&1000]) // ERROR "index bounds check elided"
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use(p1[ui&1000])
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use(p1k[ui&1000])
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use(p100k[ui&1000]) // ERROR "index bounds check elided"
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// Right shift cuts the effective number of bits in the index,
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// but only for unsigned (signed stays negative).
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use(s[i32>>22])
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use(a1[i32>>22])
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use(a1k[i32>>22])
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use(a100k[i32>>22])
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use(p1[i32>>22])
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use(p1k[i32>>22])
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use(p100k[i32>>22])
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use(s[ui32>>22])
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use(a1[ui32>>22])
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use(a1k[ui32>>22])
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use(a100k[ui32>>22]) // ERROR "index bounds check elided"
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use(p1[ui32>>22])
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use(p1k[ui32>>22])
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use(p100k[ui32>>22]) // ERROR "index bounds check elided"
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use(s[i32>>23])
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use(a1[i32>>23])
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use(a1k[i32>>23])
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use(a100k[i32>>23])
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use(p1[i32>>23])
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use(p1k[i32>>23])
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use(p100k[i32>>23])
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use(s[ui32>>23])
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use(a1[ui32>>23])
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use(a1k[ui32>>23]) // ERROR "index bounds check elided"
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use(a100k[ui32>>23]) // ERROR "index bounds check elided"
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use(p1[ui32>>23])
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use(p1k[ui32>>23]) // ERROR "index bounds check elided"
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use(p100k[ui32>>23]) // ERROR "index bounds check elided"
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// Division cuts the range like right shift does.
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use(s[i/1e6])
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use(a1[i/1e6])
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use(a1k[i/1e6])
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use(a100k[i/1e6])
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use(p1[i/1e6])
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use(p1k[i/1e6])
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use(p100k[i/1e6])
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use(s[ui/1e6])
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use(a1[ui/1e6])
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use(a1k[ui/1e6])
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use(p1[ui/1e6])
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use(p1k[ui/1e6])
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use(s[i/1e7])
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use(a1[i/1e7])
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use(a1k[i/1e7])
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use(a100k[i/1e7])
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use(p1[i/1e7])
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use(p1k[i/1e7])
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use(p100k[i/1e7])
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use(s[ui/1e7])
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use(a1[ui/1e7])
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use(p1[ui/1e7])
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}
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var sum int
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func use(x int) {
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sum += x
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}
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