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cmd/compile: load map length with the right type
len(map) is lowered to loading the first field of the map structure, which is the length. Currently it is a load of an int. With the old map, the first field is indeed an int. With Swiss map, however, it is a uint64. On big-endian 32-bit machine, loading an (32-bit) int from a uint64 would load just the high bits, which are (probably) all 0. Change to a load with the proper type. Fixes #70248. Change-Id: I39cf2d1e6658dac5a8de25c858e1580e2a14b894 Reviewed-on: https://go-review.googlesource.com/c/go/+/638375 Run-TryBot: Cherry Mui <[email protected]> LUCI-TryBot-Result: Go LUCI <[email protected]> TryBot-Result: Gopher Robot <[email protected]> Reviewed-by: Keith Randall <[email protected]> Reviewed-by: Keith Randall <[email protected]>
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