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From e66a5c025d0c3f4731a5f65ed2e6dbaf89bfaace Mon Sep 17 00:00:00 2001
From: hp <hp@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sun, 9 Sep 2018 18:05:48 +0000
Subject: [PATCH] PR target/85666 * config/mmix/mmix.c
(MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS): Don't call leaf_function_p,
instead use has_hard_reg_initial_val.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@264182 138bc75d-0d04-0410-961f-82ee72b054a4
--- a/gcc/config/mmix/mmix.c
+++ b/gcc/config/mmix/mmix.c
@@ -60,19 +60,16 @@ along with GCC; see the file COPYING3. If not see
/* We have no means to tell DWARF 2 about the register stack, so we need
to store the return address on the stack if an exception can get into
- this function. FIXME: Narrow condition. Before any whole-function
- analysis, df_regs_ever_live_p () isn't initialized. We know it's up-to-date
- after reload_completed; it may contain incorrect information some time
- before that. Within a RTL sequence (after a call to start_sequence,
- such as in RTL expanders), leaf_function_p doesn't see all insns
- (perhaps any insn). But regs_ever_live is up-to-date when
- leaf_function_p () isn't, so we "or" them together to get accurate
- information. FIXME: Some tweak to leaf_function_p might be
- preferable. */
+ this function. We'll have an "initial value" recorded for the
+ return-register if we've seen a call instruction emitted. This note
+ will be inaccurate before instructions are emitted, but the only caller
+ at that time is looking for modulo from stack-boundary, to which the
+ return-address does not contribute, and which is always 0 for MMIX
+ anyway. Beware of calling leaf_function_p here, as it'll abort if
+ called within a sequence. */
#define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS \
(flag_exceptions \
- && ((reload_completed && df_regs_ever_live_p (MMIX_rJ_REGNUM)) \
- || !leaf_function_p ()))
+ && has_hard_reg_initial_val (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM))
#define IS_MMIX_EH_RETURN_DATA_REG(REGNO) \
(crtl->calls_eh_return \
--
2.19.0
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