cmd/compile: avoid remainder in loopbce when increment=0 For non-unit increment, loopbce checks to see if the increment evenly divides the difference between (constant) loop start and end. This test panics when the increment is zero. Fix: check for zero, if found, don't optimize the loop. Also added missing copyright notice to loopbce.go. Fixes #26043. Change-Id: I5f460104879cacc94481949234c9ce8c519d6380 Reviewed-on: https://go-review.googlesource.com/120759 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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