https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123537
Bug ID: 123537
Summary: [14/15/16 Regression] ICE: verify_gimple failed:
conversion of register to a different size in
'view_convert_expr' at -O2
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 63317
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63317&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 testcase.c
testcase.c: In function 'foo':
testcase.c:12:1: error: conversion of register to a different size in
'view_convert_expr'
12 | foo()
| ^~~
VIEW_CONVERT_EXPR<long int>(_19);
_16 = VIEW_CONVERT_EXPR<long int>(_19);
during GIMPLE pass: fre
testcase.c:12:1: internal compiler error: verify_gimple failed
0x2c916cd internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0x168ee0d verify_gimple_in_cfg(function*, bool, bool)
/repo/gcc-trunk/gcc/tree-cfg.cc:5599
0x14d933a execute_function_todo
/repo/gcc-trunk/gcc/passes.cc:2100
0x14d9877 execute_todo
/repo/gcc-trunk/gcc/passes.cc:2152
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20260109220321-r16-6670-g0a98b1a6ac91cb-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20260109220321-r16-6670-g0a98b1a6ac91cb-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20260108 (experimental) (GCC)
