and Identifier Scopes §33. Expression Evaluation Orders §34. Value Copy Costs in Go §35. Bounds Check Elimination Concurrent Programming §36. Concurrency Synchronization Overview §37. Channel Use Cases to) output code warnings (a.k.a., possible code logic mistakes). We can use the go vet command to check and report such warnings. We can (and should often) use the go fmt command to format Go source code int(^uint(0) >> 1) A similar method can be used to get the number of bits of a native word, and check the current OS is 32-bit or 64-bit. 1| // NativeWordBits is 64 or 32. 2| const NativeWordBits =

and Identifier Scopes §33. Expression Evaluation Orders §34. Value Copy Costs in Go §35. Bounds Check Elimination Concurrent Programming §36. Concurrency Synchronization Overview §37. Channel Use Cases to) output code warnings (a.k.a., possible code logic mistakes). We can use the go vet command to check and report such warnings. We can (and should often) use the go fmt command to format Go source code int(^uint(0) >> 1) A similar method can be used to get the number of bits of a native word, and check the current OS is 32-bit or 64-bit. // NativeWordBits is 64 or 32. const NativeWordBits = 32 << (^uint(0)

and Identifier Scopes §33. Expression Evaluation Orders §34. Value Copy Costs in Go §35. Bounds Check Elimination Concurrent Programming §36. Concurrency Synchronization Overview §37. Channel Use Cases to) output code warnings (a.k.a., possible code logic mistakes). We can use the go vet command to check and report such warnings. We can (and should often) use the go fmt command to format Go source code int(^uint(0) >> 1) A similar method can be used to get the number of bits of a native word, and check the current OS is 32-bit or 64-bit. 1| // NativeWordBits is 64 or 32. 2| const NativeWordBits =

SSA使得Go编译器可以有效利用诸如 BCE（https://en.wikipedia.org/wiki/Bounds-checking_elimination）（bounds check elimination，边界检查消除）和CSE （https://en.wikipedia.org/wiki/Common_subexpression_elimination） （common subexpression subexpression elimination，公共子表达式消除）等优化。 BCE可以避 免很多不必要的边界检查，CSE可以避免很多重复表达式的计算，从而使得编译器编 译出的程序执行效率更高。有时候这些优化的效果非常明显。 本文将展示一些例子来解释边界检查消除在官方标准编译器1.7+中的表现。 对于Go官方工具链1.7+，我们可以使用编译器选项-gcflags="- d=ssa/check_bce"来列出哪些代码行仍然需要边界检查。 22| _ = a[4] // 第22行： 边界检查消除了！ 23| } 24| 25| func main() {} $ go run -gcflags="-d=ssa/check_bce" example1.go ./example1.go:5: Found IsInBounds ./example1.go:6: Found IsInBounds ./example1

printf() and stdio in the Julia runtime . . . . . . . . . . . . . . . . . . . . . . . . . . 1877 105.18 Bounds checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1879 105.19 Proper will run to check for a new Juliaup version in seconds. The default value is 0, i.e. no CRON job will be created. • --startup-selfupdate=: Configure how often Julia will check for new versions modern computer hardware. In scenarios where overflow is a possibility, it is crucial to explicitly check for wraparound effects that can result from such overflows. The Base.Checked module provides a suite

printf() and stdio in the Julia runtime . . . . . . . . . . . . . . . . . . . . . . . . . . 1877 105.18 Bounds checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1879 105.19 Proper will run to check for a new Juliaup version in seconds. The default value is 0, i.e. no CRON job will be created. • --startup-selfupdate=: Configure how often Julia will check for new versions modern computer hardware. In scenarios where overflow is a possibility, it is crucial to explicitly check for wraparound effects that can result from such overflows. The Base.Checked module provides a suite

printf() and stdio in the Julia runtime . . . . . . . . . . . . . . . . . . . . . . . . . . 1877 105.18 Bounds checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1879 105.19 Proper will run to check for a new Juliaup version in seconds. The default value is 0, i.e. no CRON job will be created. • --startup-selfupdate=: Configure how often Julia will check for new versions modern computer hardware. In scenarios where overflow is a possibility, it is crucial to explicitly check for wraparound effects that can result from such overflows. The Base.Checked module provides a suite

printf() and stdio in the Julia runtime . . . . . . . . . . . . . . . . . . . . . . . . . . 1931 106.18 Bounds checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1933 106.19 Proper already know Julia a bit, you might want to peek ahead at Performance Tips and Workflow Tips, or check out the comprehensive ModernJuliaWorkflows blog.Chapter 3 Installation There are many ways to install will run to check for a new Juliaup version in seconds. The default value is 0, i.e. no CRON job will be created. • --startup-selfupdate=: Configure how often Julia will check for new versions

printf() and stdio in the Julia runtime . . . . . . . . . . . . . . . . . . . . . . . . . . 1928 106.18 Bounds checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1930 106.19 Proper already know Julia a bit, you might want to peek ahead at Performance Tips and Workflow Tips, or check out the comprehensive ModernJuliaWorkflows blog.Chapter 3 Installation There are many ways to install will run to check for a new Juliaup version in seconds. The default value is 0, i.e. no CRON job will be created. • --startup-selfupdate=: Configure how often Julia will check for new versions

printf() and stdio in the Julia runtime . . . . . . . . . . . . . . . . . . . . . . . . . . 1928 106.18 Bounds checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1930 106.19 Proper already know Julia a bit, you might want to peek ahead at Performance Tips and Workflow Tips, or check out the comprehensive ModernJuliaWorkflows blog.Chapter 3 Installation There are many ways to install will run to check for a new Juliaup version in seconds. The default value is 0, i.e. no CRON job will be created. • --startup-selfupdate=: Configure how often Julia will check for new versions