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compiler: add "target-cpu" and "target-features" attributes

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This matches Clang, and with that, it adds support for inlining between
Go and C because LLVM only allows inlining if the "target-cpu" and
"target-features" string attributes match.

For example, take a look at the following code:

    // int add(int a, int b) {
    //   return a + b;
    // }
    import "C"

    func main() {
        println(C.add(3, 5))
    }

The 'add' function is not inlined into the main function before this
commit, but after it, it can be inlined and trivially be optimized to
`println(8)`.
This commit is contained in:
Ayke van Laethem
2021-11-07 15:33:44 +01:00
committed by Ron Evans
parent 78fec3719f
commit cf640290a3
6 changed files with 23 additions and 7 deletions
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compiler/compiler.go
+1 -1
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@@ -23,7 +23,7 @@ import (
// Version of the compiler pacakge. Must be incremented each time the compiler
// package changes in a way that affects the generated LLVM module.
// This version is independent of the TinyGo version number.
const Version = 24 // last change: add layout param to runtime.alloc calls
const Version = 25 // last change: add "target-cpu" and "target-features" attributes
func init() {
llvm.InitializeAllTargets()