gccgo: internal compiler error: in gen_reg_rtx, at emit-rtl

[ALTree]

$ gccgo --version
gccgo (Debian 12.2.0-3) 12.2.0

package main

type S string

func main() {
	m := map[int]int{1: 1}
	println(m[len(S(""))])
}

$ gccgo crash.go 

go1: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1199
0x7fc936229209 __libc_start_call_main
	../sysdeps/nptl/libc_start_call_main.h:58
0x7fc9362292bb __libc_start_main_impl
	../csu/libc-start.c:389
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-12/README.Bugs> for instructions.

[ianlancetaylor]

Interestingly it only fails when compiling without optimization.

[gopherbot]

Change https://go.dev/cl/441555 mentions this issue: compiler: treat S("") as a string constant

[ALTree]

Interestingly it only fails when compiling without optimization.

At least on gccgo 12.2.0, I see a crash on -O2 too. Godbolt link.

[ianlancetaylor]

Hmmm, I see that in your Godbolt link but I haven't been able to recreate it locally. Odd. But I guess it doesn't matter too much.