19dec048b0
Previously there was code to avoid impossible type asserts but it wasn't
great and in fact was too aggressive when combined with reflection.
This commit improves this by checking all types that exist in the
program that may appear in an interface (even struct fields and the
like) but without creating runtime.typecodeID objects with the type
assert. This has two advantages:
* As mentioned, it optimizes impossible type asserts away.
* It allows methods on types that were only asserted on (in
runtime.typeAssert) but never used in an interface to be optimized
away using GlobalDCE. This may have a cascading effect so that other
parts of the code can be further optimized.
This sometimes massively improves code size and mostly negates the code
size regression of the previous commit.
131 строка
4,3 КиБ
LLVM
131 строка
4,3 КиБ
LLVM
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7m-none-eabi"
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%runtime.typecodeID = type { %runtime.typecodeID*, i32, %runtime.interfaceMethodInfo* }
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%runtime.interfaceMethodInfo = type { i8*, i32 }
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@"reflect/types.type:basic:uint8" = external constant %runtime.typecodeID
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@"reflect/types.type:basic:uint8$id" = external constant i8
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@"reflect/types.type:basic:int16$id" = external constant i8
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@"reflect/types.type:basic:int" = external constant %runtime.typecodeID
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@"func NeverImplementedMethod()" = external constant i8
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@"func Double() int" = external constant i8
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@"reflect/types.type:named:Number" = private constant %runtime.typecodeID zeroinitializer
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declare i1 @runtime.interfaceImplements(i32, i8**)
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declare i1 @runtime.typeAssert(i32, i8*)
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declare i32 @runtime.interfaceMethod(i32, i8**, i8*)
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declare void @runtime.printuint8(i8)
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declare void @runtime.printint16(i16)
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declare void @runtime.printint32(i32)
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declare void @runtime.printptr(i32)
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declare void @runtime.printnl()
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declare void @runtime.nilPanic(i8*, i8*)
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define void @printInterfaces() {
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call void @printInterface(i32 4, i8* inttoptr (i32 5 to i8*))
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call void @printInterface(i32 16, i8* inttoptr (i8 120 to i8*))
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call void @printInterface(i32 68, i8* inttoptr (i32 3 to i8*))
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ret void
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}
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define void @printInterface(i32 %typecode, i8* %value) {
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%typeassert.ok1 = call i1 @"Unmatched$typeassert"(i32 %typecode)
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br i1 %typeassert.ok1, label %typeswitch.Unmatched, label %typeswitch.notUnmatched
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typeswitch.Unmatched: ; preds = %0
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%unmatched = ptrtoint i8* %value to i32
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call void @runtime.printptr(i32 %unmatched)
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call void @runtime.printnl()
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ret void
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typeswitch.notUnmatched: ; preds = %0
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%typeassert.ok = call i1 @"Doubler$typeassert"(i32 %typecode)
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br i1 %typeassert.ok, label %typeswitch.Doubler, label %typeswitch.notDoubler
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typeswitch.Doubler: ; preds = %typeswitch.notUnmatched
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%1 = call i32 @"(Doubler).Double"(i8* %value, i8* null, i32 %typecode, i8* null)
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call void @runtime.printint32(i32 %1)
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ret void
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typeswitch.notDoubler: ; preds = %typeswitch.notUnmatched
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%typeassert.ok2 = icmp eq i32 16, %typecode
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br i1 %typeassert.ok2, label %typeswitch.byte, label %typeswitch.notByte
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typeswitch.byte: ; preds = %typeswitch.notDoubler
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%byte = ptrtoint i8* %value to i8
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call void @runtime.printuint8(i8 %byte)
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call void @runtime.printnl()
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ret void
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typeswitch.notByte: ; preds = %typeswitch.notDoubler
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br i1 false, label %typeswitch.int16, label %typeswitch.notInt16
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typeswitch.int16: ; preds = %typeswitch.notByte
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%int16 = ptrtoint i8* %value to i16
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call void @runtime.printint16(i16 %int16)
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call void @runtime.printnl()
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ret void
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typeswitch.notInt16: ; preds = %typeswitch.notByte
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ret void
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}
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define i32 @"(Number).Double"(i32 %receiver, i8* %parentHandle) {
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%ret = mul i32 %receiver, 2
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ret i32 %ret
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}
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define i32 @"(Number).Double$invoke"(i8* %receiverPtr, i8* %parentHandle) {
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%receiver = ptrtoint i8* %receiverPtr to i32
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%ret = call i32 @"(Number).Double"(i32 %receiver, i8* null)
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ret i32 %ret
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}
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define internal i32 @"(Doubler).Double"(i8* %0, i8* %1, i32 %actualType, i8* %parentHandle) unnamed_addr {
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entry:
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switch i32 %actualType, label %default [
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i32 68, label %"reflect/types.type:named:Number"
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]
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default: ; preds = %entry
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call void @runtime.nilPanic(i8* undef, i8* undef)
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unreachable
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"reflect/types.type:named:Number": ; preds = %entry
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%2 = call i32 @"(Number).Double$invoke"(i8* %0, i8* %1)
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ret i32 %2
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}
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define internal i1 @"Doubler$typeassert"(i32 %actualType) unnamed_addr {
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entry:
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switch i32 %actualType, label %else [
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i32 68, label %then
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]
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then: ; preds = %entry
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ret i1 true
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else: ; preds = %entry
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ret i1 false
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}
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define internal i1 @"Unmatched$typeassert"(i32 %actualType) unnamed_addr {
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entry:
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switch i32 %actualType, label %else [
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]
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then: ; No predecessors!
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ret i1 true
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else: ; preds = %entry
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ret i1 false
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}
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