https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102584
Bug ID: 102584
Summary: [OpenRISC] backend generates wrong halfword constant
Product: gcc
Version: 11.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: thrustl at hotmail dot com
Target Milestone: ---
The following simple program:
void f1(unsigned short);
void f2(short);
int main()
{
f1(0xf123);
f2(0xf123);
}
When compiled with
$ openrisc-linux-gnu-gcc -S 35.c
generates the following assembly:
.section .text
.align 4
.global main
.type main, @function
main:
l.addi r1, r1, -8
l.sw 0(r1), r2
l.addi r2, r1, 8
l.sw 4(r1), r9
l.xori r3, r0, -3805
l.jal f1
l.nop
l.xori r3, r0, -3805
l.jal f2
l.nop
l.movhi r17, hi(0)
l.or r11, r17, r17
l.lwz r2, 0(r1)
l.lwz r9, 4(r1)
l.addi r1, r1, 8
l.jr r9
l.nop
.size main, .-main
Both f1() and f2() are called with signed constant -3805. I believe f1() should
be called with unsigned constant 0xf123, generated by l.ori instruction.
GCC version (comes with Fedora 34):
$ openrisc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=openrisc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/or1k-linux/11/lto-wrapper
Target: or1k-linux
Configured with: ../gcc-11.2.1-20210728/configure --bindir=/usr/bin
--build=x86_64-redhat-linux-gnu --datadir=/usr/share --disable-decimal-float
--disable-dependency-tracking --disable-gold --disable-libgcj --disable-libgomp
--disable-libmpx --disable-libquadmath --disable-libssp
--disable-libunwind-exceptions --disable-shared --disable-silent-rules
--disable-sjlj-exceptions --disable-threads
--with-ld=/usr/bin/openrisc-linux-gnu-ld --enable-__cxa_atexit
--enable-checking=release --enable-gnu-unique-object --enable-initfini-array
--enable-languages=c,c++ --enable-linker-build-id --enable-lto --enable-nls
--enable-obsolete --enable-plugin --enable-targets=all --exec-prefix=/usr
--host=x86_64-redhat-linux-gnu --includedir=/usr/include
--infodir=/usr/share/info --libexecdir=/usr/libexec --localstatedir=/var
--mandir=/usr/share/man --prefix=/usr --program-prefix=openrisc-linux-gnu-
--sbindir=/usr/sbin --sharedstatedir=/var/lib --sysconfdir=/etc
--target=or1k-linux --with-bugurl=http://bugzilla.redhat.com/bugzilla/
--with-gcc-major-version-only --with-isl --with-newlib
--with-plugin-ld=/usr/bin/openrisc-linux-gnu-ld
--with-sysroot=/usr/openrisc-linux-gnu/sys-root --with-system-libunwind
--with-system-zlib --without-headers --with-linker-hash-style=gnu
Thread model: single
Supported LTO compression algorithms: zlib zstd
gcc version 11.2.1 20210728 (Red Hat Cross 11.2.1-1) (GCC)
I also tried to recompile and got the same result.
