cmd/compile: internal compiler error: PPC64 shift arg mb out of range #42610
Description
$ gotip version
go version devel +f423d616b1 Fri Nov 13 15:15:15 2020 +0000 linux/amd64
The following program:
package p
func f(a []int, i uint) {
g := func(p int) int {
i = uint(p) * (uint(p) & (i & 1))
return 1
}
a[0] = g(8) >> 1
}
Crashes the tip compiler when built for ppc64 or ppc64le:
$ GOARCH=ppc64 gotip tool compile crash.go
# command-line-arguments
./crash.go:8:4: internal compiler error: 'f': panic during lower while compiling f:
PPC64 shift arg mb out of range
[...]
It compiles fine on go1.15.5.
Bisected to 967465d.
cc @laboger