3712c7a301
LOAD_EXTEND_OP only applies to scalar integer modes that are narrower than a word. However, callers weren't consistent about which of these checks they made beforehand, and also weren't consistent about whether "smaller" was based on (bit)size or precision (IMO it's the latter). This patch adds a wrapper to try to make the macro easier to use. LOAD_EXTEND_OP is often used to disable transformations that aren't beneficial when extends from memory are free, so being stricter about the check accidentally exposed more optimisation opportunities. "SUBREG_BYTE (...) == 0" and subreg_lowpart_p are implied by paradoxical_subreg_p, so the patch also removes some redundant tests. The patch doesn't change reload, since different checks could have unforeseen consequences. gcc/ 2016-11-15 Richard Sandiford <richard.sandiford@arm.com> Alan Hayward <alan.hayward@arm.com> David Sherwood <david.sherwood@arm.com> * rtl.h (load_extend_op): Declare. * rtlanal.c (load_extend_op): New function. (nonzero_bits1): Use it. (num_sign_bit_copies1): Likewise. * cse.c (cse_insn): Likewise. * fold-const.c (fold_single_bit_test): Likewise. (fold_unary_loc): Likewise. * fwprop.c (free_load_extend): Likewise. * postreload.c (reload_cse_simplify_set): Likewise. (reload_cse_simplify_operands): Likewise. * combine.c (try_combine): Likewise. (simplify_set): Likewise. Remove redundant SUBREG_BYTE and subreg_lowpart_p checks. Co-Authored-By: Alan Hayward <alan.hayward@arm.com> Co-Authored-By: David Sherwood <david.sherwood@arm.com> From-SVN: r242444 |
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| boehm-gc | ||
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcilkrts | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libiberty | ||
| libitm | ||
| libmpx | ||
| libobjc | ||
| liboffloadmic | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
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| compile | ||
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| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
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| missing | ||
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| mkinstalldirs | ||
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