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compiler: fix odd bounds check failure with impossible typeassert

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This commit is contained in:
Ayke van Laethem
2018-10-20 17:21:47 +02:00
parent 77d6d6c417
commit 3f05490846
1 changed files with 2 additions and 2 deletions
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compiler/compiler.go
+2 -2
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@@ -2049,8 +2049,8 @@ func (c *Compiler) emitBoundsCheck(frame *Frame, arrayLen, index llvm.Value) {
}
// Optimize away trivial cases.
// LLVM would do this anyway with interprocedural optimizations, but it
// helps to see cases where bounds checking would really help.
if index.IsConstant() && arrayLen.IsConstant() {
// helps to see cases where bounds check elimination would really help.
if index.IsConstant() && arrayLen.IsConstant() && !arrayLen.IsUndef() {
index := index.SExtValue()
arrayLen := arrayLen.SExtValue()
if index >= 0 && index < arrayLen {