cfgexpand sorts variables by decreasing size, so when merging a later variable into an earlier one, there's usually no need to update the merged size. But for poly_int sizes, the sort function just uses a lexicographical comparison of the coefficients, so e.g. 2X+2 comes before 0X+32. Which is bigger depends on the runtime value of X. This patch therefore takes the upper bound of the two sizes, which is conservatively correct for variable-length vectors and a no-op on other targets. It's probably a bad idea to merge fixed-length and variable-length variables in practice, but that's really an optimisation decision. I think we should have this patch as a correctness fix either way. This is easiest to test using the ACLE, but in principle it could happen for autovectorised code too, e.g. when using OpenMP vector variables. It's therefore a regression from GCC 8. 2020-01-22 Richard Sandiford <richard.sandiford@arm.com> gcc/ * cfgexpand.c (union_stack_vars): Update the size. gcc/testsuite/ * gcc.target/aarch64/sve/acle/general/stack_vars_1.c: New test.
Name |
Last commit
|
Last update |
---|---|---|
INSTALL | Loading commit data... | |
config | Loading commit data... | |
contrib | Loading commit data... | |
fixincludes | Loading commit data... | |
gcc | Loading commit data... | |
gnattools | Loading commit data... | |
gotools | Loading commit data... | |
include | Loading commit data... | |
intl | Loading commit data... | |
libada | Loading commit data... | |
libatomic | Loading commit data... | |
libbacktrace | Loading commit data... | |
libcc1 | Loading commit data... | |
libcpp | Loading commit data... | |
libdecnumber | Loading commit data... | |
libffi | Loading commit data... | |
libgcc | Loading commit data... | |
libgfortran | Loading commit data... | |
libgo | Loading commit data... | |
libgomp | Loading commit data... | |
libhsail-rt | Loading commit data... | |
libiberty | Loading commit data... | |
libitm | Loading commit data... | |
libobjc | Loading commit data... | |
liboffloadmic | Loading commit data... | |
libphobos | Loading commit data... | |
libquadmath | Loading commit data... | |
libsanitizer | Loading commit data... | |
libssp | Loading commit data... | |
libstdc++-v3 | Loading commit data... | |
libvtv | Loading commit data... | |
lto-plugin | Loading commit data... | |
maintainer-scripts | Loading commit data... | |
zlib | Loading commit data... | |
.dir-locals.el | Loading commit data... | |
.gitattributes | Loading commit data... | |
.gitignore | Loading commit data... | |
ABOUT-NLS | Loading commit data... | |
COPYING | Loading commit data... | |
COPYING.LIB | Loading commit data... | |
COPYING.RUNTIME | Loading commit data... | |
COPYING3 | Loading commit data... | |
COPYING3.LIB | Loading commit data... | |
ChangeLog | Loading commit data... | |
ChangeLog.jit | Loading commit data... | |
ChangeLog.tree-ssa | Loading commit data... | |
MAINTAINERS | Loading commit data... | |
Makefile.def | Loading commit data... | |
Makefile.in | Loading commit data... | |
Makefile.tpl | Loading commit data... | |
README | Loading commit data... | |
ar-lib | Loading commit data... | |
compile | Loading commit data... | |
config-ml.in | Loading commit data... | |
config.guess | Loading commit data... | |
config.rpath | Loading commit data... | |
config.sub | Loading commit data... | |
configure | Loading commit data... | |
configure.ac | Loading commit data... | |
depcomp | Loading commit data... | |
install-sh | Loading commit data... | |
libtool-ldflags | Loading commit data... | |
libtool.m4 | Loading commit data... | |
ltgcc.m4 | Loading commit data... | |
ltmain.sh | Loading commit data... | |
ltoptions.m4 | Loading commit data... | |
ltsugar.m4 | Loading commit data... | |
ltversion.m4 | Loading commit data... | |
lt~obsolete.m4 | Loading commit data... | |
missing | Loading commit data... | |
mkdep | Loading commit data... | |
mkinstalldirs | Loading commit data... | |
move-if-change | Loading commit data... | |
multilib.am | Loading commit data... | |
symlink-tree | Loading commit data... | |
test-driver | Loading commit data... | |
ylwrap | Loading commit data... |