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gccgo: internal compiler error: in gen_reg_rtx, at emit-rtl #56113

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ALTree opened this issue Oct 9, 2022 · 4 comments
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gccgo: internal compiler error: in gen_reg_rtx, at emit-rtl #56113

ALTree opened this issue Oct 9, 2022 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Gccgo

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@ALTree
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ALTree commented Oct 9, 2022 

$ 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.
@ALTree ALTree added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Oct 9, 2022
@ALTree ALTree added this to the Gccgo milestone Oct 9, 2022
@ianlancetaylor
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Interestingly it only fails when compiling without optimization.

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

@ALTree
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ALTree commented Oct 9, 2022

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
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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.

nstester pushed a commit to nstester/gcc that referenced this issue Oct 10, 2022
@ianlancetaylor
compiler: treat S("") as a string constant
29b0fe3 
The compiler neglected to notice that a conversion from a string
constant to a string type was a valid string constant.

No test case because this only caused a compiler failure when compiling
without optimization, which is not the normal case, and is not a case
that we test.

Fixes golang/go#56113

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/441555
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