https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91430
Bug ID: 91430
Summary: ICE in curr_insn_transform, at lra-constraints.c:3962
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: novalazy at gmail dot com
Target Milestone: ---
Hi, the following test case hits an ICE in gcc 9.1.0 on x86_64.
% cat test.c
register unsigned long a __asm__("r14");
register unsigned long b __asm__("r15");
void test(void)
{
b = a << 4;
}
% gcc -O1 -c test.c
test.c: In function 'test':
test.c:7:1: error: unable to generate reloads for:
7 | }
| ^
(insn 6 5 9 2 (parallel [
(set (reg/v:DI 43 r15 [ b ])
(ashift:DI (reg/v:DI 42 r14 [ a ])
(const_int 4 [0x4])))
(clobber (reg:CC 17 flags))
]) "test.c":6:11 520 {*ashldi3_1}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
during RTL pass: reload
test.c:7:1: internal compiler error: in curr_insn_transform, at
lra-constraints.c:3962
% gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/9.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-lto --enable-plugin --enable-install-libiberty
--with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib
--disable-werror --enable-checking=release --enable-default-pie
--enable-default-ssp --enable-cet=auto
Thread model: posix
gcc version 9.1.0 (GCC)
