mirror of git://gcc.gnu.org/git/gcc.git
901e66e03e
This patch is part of a series that enables ARMv8.5-A in GCC and adds Branch Target Identification Mechanism. This patch changes the registers that are allowed for indirect tail calls. We are choosing to restrict these to only x16 or x17. Indirect tail calls are special in a way that they convert a call statement (BLR instruction) to a jump statement (BR instruction). For the best possible use of Branch Target Identification Mechanism, we would like to place a "BTI C" (call) at the beginning of the function which is only compatible with BLRs and BR X16/X17. In order to make indirect tail calls compatible with this scenario, we are restricting the TAILCALL_ADDR_REGS. In order to use x16/x17 for this purpose, we also had to change the use of these registers in the epilogue/prologue handling. For this purpose we are now using x12 and x13 named as EP0_REGNUM and EP1_REGNUM as scratch registers for epilogue and prologue. *** gcc/ChangeLog*** 2018-01-09 Sudakshina Das <sudi.das@arm.com> * config/aarch64/aarch64.c (aarch64_expand_prologue): Use new epilogue/prologue scratch registers EP0_REGNUM and EP1_REGNUM. (aarch64_expand_epilogue): Likewise. (aarch64_output_mi_thunk): Likewise * config/aarch64/aarch64.h (REG_CLASS_CONTENTS): Change TAILCALL_ADDR_REGS to x16 and x17. * config/aarch64/aarch64.md: Define EP0_REGNUM and EP1_REGNUM. *** gcc/testsuite/ChangeLog *** 2018-01-09 Sudakshina Das <sudi.das@arm.com> * gcc.target/aarch64/test_frame_17.c: Update to check for EP0_REGNUM instead of IP0_REGNUM and add test case. From-SVN: r267767 |
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README
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.