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compiler: fix max possible slice

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This commit improves make([]T, len) to be closer to upstream Go. The
difference is unlikely to have much real-world effect, but previously
certain make([]T, len) expressions would not result in a slice out of
bounds error in TinyGo while they would have done such a thing in Go
proper. In practice, available RAM is likely to be a bigger limiting
factor.
This commit is contained in:
Ayke van Laethem
2021-08-15 02:08:15 +02:00
committed by Ron Evans
parent a2cc5715ba
commit 0f2f73be53
2 changed files with 29 additions and 8 deletions
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compiler/testdata/slice.ll
Vendored
+2 -2
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@@ -127,7 +127,7 @@ slice.next: ; preds = %entry
define hidden { [3 x i8]*, i32, i32 } @main.makeArraySlice(i32 %len, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%slice.maxcap = icmp slt i32 %len, 0
%slice.maxcap = icmp ugt i32 %len, 1431655765
br i1 %slice.maxcap, label %slice.throw, label %slice.next
slice.throw: ; preds = %entry
@@ -146,7 +146,7 @@ slice.next: ; preds = %entry
define hidden { i32*, i32, i32 } @main.makeInt32Slice(i32 %len, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%slice.maxcap = icmp slt i32 %len, 0
%slice.maxcap = icmp ugt i32 %len, 1073741823
br i1 %slice.maxcap, label %slice.throw, label %slice.next
slice.throw: ; preds = %entry