The current frame code combines the separate concepts of a frame chain (saving old FP,LR in a record and pointing new FP to it) and a frame pointer used to access locals. Add emit_frame_chain to the aarch64_frame descriptor and use it in the prolog and epilog code. For now just initialize it as before, so generated code is identical. Also correctly set EXIT_IGNORE_STACK. The current AArch64 epilog code restores SP from FP if alloca is used. If a frame pointer is used but there is no alloca, SP must remain valid for the epilog to work correctly. gcc/ * config/aarch64/aarch64.h (EXIT_IGNORE_STACK): Set if alloca is used. (aarch64_frame): Add emit_frame_chain boolean. * config/aarch64/aarch64.c (aarch64_frame_pointer_required) Move eh_return case to aarch64_layout_frame. (aarch64_layout_frame): Initialize emit_frame_chain. (aarch64_expand_prologue): Use emit_frame_chain. From-SVN: r254114
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