From f9e1c86b3397faa8dee4bbaeaf8b56492e3a63df Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Fri, 16 Jun 2023 17:00:51 +0100 Subject: [PATCH 26/32] aarch64: Explicitly handle frames with no saved registers If a frame has no saved registers, it can be allocated in one go. There is no need to treat the areas below and above the saved registers as separate. This is a no-op as thing stand, since a leaf function will have no outgoing arguments, and so all the frame will be above where the saved registers normally go. gcc/ * config/aarch64/aarch64.c (aarch64_layout_frame): Explicitly allocate the frame in one go if there are no saved registers. --- gcc/config/aarch64/aarch64.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 4ad73220337f..ed9e2a28f914 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -4215,9 +4215,11 @@ aarch64_layout_frame (void) max_push_offset = 256; HOST_WIDE_INT const_size, const_fp_offset; - if (cfun->machine->frame.frame_size.is_constant (&const_size) - && const_size < max_push_offset - && known_eq (crtl->outgoing_args_size, 0)) + if (cfun->machine->frame.saved_regs_size == 0) + cfun->machine->frame.initial_adjust = cfun->machine->frame.frame_size; + else if (cfun->machine->frame.frame_size.is_constant (&const_size) + && const_size < max_push_offset + && known_eq (crtl->outgoing_args_size, 0)) { /* Simple, small frame with no outgoing arguments: stp reg1, reg2, [sp, -frame_size]! -- 2.42.0