59a3d73d50
wb_candidate1 and wb_candidate2 exist for two overlapping cases: when we use an STR or STP with writeback to allocate the frame, and when we set up a frame chain record (either using writeback allocation or not). However, aarch64_layout_frame was leaving these fields with legitimate register numbers even if we decided to do neither of those things. This prevented those registers from being shrink-wrapped, even though we were otherwise treating them as normal saves and restores. The case this patch handles isn't the common case, so it might not be worth going out of our way to optimise it. But I think the patch actually makes the output of aarch64_layout_frame more consistent. 2020-05-28 Richard Sandiford <richard.sandiford@arm.com> gcc/ * config/aarch64/aarch64.h (aarch64_frame): Add a comment above wb_candidate1 and wb_candidate2. * config/aarch64/aarch64.c (aarch64_layout_frame): Invalidate wb_candidate1 and wb_candidate2 if we decided not to use them. gcc/testsuite/ * gcc.target/aarch64/shrink_wrap_1.c: New test. |
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config | ||
contrib | ||
fixincludes | ||
gcc | ||
gnattools | ||
gotools | ||
include | ||
INSTALL | ||
intl | ||
libada | ||
libatomic | ||
libbacktrace | ||
libcc1 | ||
libcpp | ||
libdecnumber | ||
libffi | ||
libgcc | ||
libgfortran | ||
libgo | ||
libgomp | ||
libhsail-rt | ||
libiberty | ||
libitm | ||
libobjc | ||
liboffloadmic | ||
libphobos | ||
libquadmath | ||
libsanitizer | ||
libssp | ||
libstdc++-v3 | ||
libvtv | ||
lto-plugin | ||
maintainer-scripts | ||
zlib | ||
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ar-lib | ||
ChangeLog | ||
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compile | ||
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config.guess | ||
config.rpath | ||
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configure | ||
configure.ac | ||
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COPYING3 | ||
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depcomp | ||
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lt~obsolete.m4 | ||
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ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
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MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
multilib.am | ||
README | ||
symlink-tree | ||
test-driver | ||
ylwrap |
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